diff --git a/assets/webui/index.html b/assets/webui/index.html
index 4f9927c..fa54778 100644
--- a/assets/webui/index.html
+++ b/assets/webui/index.html
@@ -123,7 +123,7 @@
 				<label class="editor-field"><span>行距</span><span class="editor-number"><input id="textLineHeight" type="number" min="0" step="any" placeholder="自动" aria-label="行距" title="行距，0为自动" disabled><span>pt</span></span></label>
 				<button id="textWrap" class="button" type="button" aria-label="自动折行" aria-pressed="false" disabled>折行</button>
 				<label class="editor-field"><span>字距</span><span class="editor-number"><input id="textSpacing" type="number" step="any" placeholder="0" aria-label="字距" title="字距" disabled><span>pt</span></span></label>
-				<span>段落</span>
+				<button id="paragraphButton" class="editor-group-action" type="button" title="段落缩进" aria-label="段落缩进" aria-haspopup="dialog" aria-controls="paragraphPanel" disabled>段落</button>
 			</div>
 			<div class="editor-group">
 				<div class="shape-paint"><label><input id="shapeFill" type="checkbox">填充</label><input id="shapeFillColor" class="color-input" type="color" value="#dcefeb" aria-label="填充颜色" title="填充颜色"></div>
@@ -155,7 +155,7 @@
 				<span>变换</span>
 			</div>
 			<div class="editor-group">
-				<button id="addPageButton" class="button" type="button" aria-label="新增页面">新增</button>
+				<select id="addPageButton" aria-label="新增页面" title="新增页面"><option value="" hidden>新增</option><option value="blank">空白</option><option value="import">插页</option></select>
 				<button id="copyPageButton" class="button" type="button" aria-label="复制页面">复制</button>
 				<button id="deletePageButton" class="button" type="button" aria-label="删除页面">删除</button>
 				<button id="movePagePrevButton" class="button" type="button" aria-label="页面前移">前移</button>
@@ -187,6 +187,25 @@
 				</div>
 			</form>
 		</dialog>
+		<dialog id="importPanel" class="form-dialog" aria-label="插入页面">
+			<form id="importForm">
+				<div class="form-row"><label for="importFile">文档</label><input id="importFile" type="file" accept=".ofd" required autofocus></div>
+				<div class="form-row"><label for="importRange">范围</label><select id="importRange"><option value="all">全部</option><option value="custom">指定</option></select></div>
+				<div id="importPagesRow" class="form-row" hidden><label for="importPages">页码</label><input id="importPages" type="text" autocomplete="off" spellcheck="false" disabled></div>
+				<div class="form-row"><label for="importPosition">位置</label><select id="importPosition"><option value="before">页前</option><option value="after" selected>页后</option><option value="first">首部</option><option value="last">末尾</option></select></div>
+				<div class="form-actions"><div id="importStatus" class="form-status" role="status"></div><button id="importCancel" class="button" type="button">取消</button><button id="importSubmit" class="button" type="submit" disabled>插入</button></div>
+			</form>
+		</dialog>
+		<dialog id="paragraphPanel" class="form-dialog" aria-label="段落缩进">
+			<form id="paragraphForm">
+				<div class="form-row"><label for="firstLineIndent">首行</label><div class="form-unit"><input id="firstLineIndent" type="number" step="any" required autofocus><span>mm</span></div></div>
+				<div class="form-pair">
+					<div class="form-row"><label for="leftIndent">左侧</label><div class="form-unit"><input id="leftIndent" type="number" step="any" required><span>mm</span></div></div>
+					<div class="form-row"><label for="rightIndent">右侧</label><div class="form-unit"><input id="rightIndent" type="number" step="any" required><span>mm</span></div></div>
+				</div>
+				<div class="form-actions"><div id="paragraphStatus" class="form-status" role="status"></div><button id="paragraphCancel" class="button" type="button">取消</button><button class="button" type="submit">确定</button></div>
+			</form>
+		</dialog>
 		<dialog id="pagePanel" class="form-dialog" aria-label="页面设置">
 			<form id="pageForm">
 				<div class="form-row">
diff --git a/assets/webui/ofdgo.css b/assets/webui/ofdgo.css
index df21b11..c00fe60 100644
--- a/assets/webui/ofdgo.css
+++ b/assets/webui/ofdgo.css
@@ -334,7 +334,8 @@ a:focus-visible {
 	border-right: 0;
 }
 
-.editor-group > span {
+.editor-group > span,
+.editor-group-action {
 	grid-column: 1 / -1;
 	grid-row: 3;
 	align-self: end;
@@ -343,6 +344,26 @@ a:focus-visible {
 	color: var(--text-muted);
 }
 
+.editor-group-action {
+	justify-self: center;
+	padding: 0 8px;
+	height: 16px;
+	min-height: 0;
+	border: 0;
+	background: transparent;
+	line-height: 16px;
+	text-decoration: underline dotted;
+	text-underline-offset: 3px;
+}
+
+.mixed-color::-webkit-color-swatch {
+	background: repeating-linear-gradient(135deg, #fff 0 4px, #aeb7bc 4px 8px);
+}
+
+.mixed-color::-moz-color-swatch {
+	background: repeating-linear-gradient(135deg, #fff 0 4px, #aeb7bc 4px 8px);
+}
+
 .app-bar {
 	display: flex;
 	align-items: center;
diff --git a/assets/webui/ofdgo.js b/assets/webui/ofdgo.js
index 3dfbfc4..a691146 100644
--- a/assets/webui/ofdgo.js
+++ b/assets/webui/ofdgo.js
@@ -1,4 +1,4 @@
-import { CanvasEditor, canEditObject, missingGlyphMessage, objectEditReason } from "./ofdgo_edit.js";
+import { CanvasEditor, canEditObject, missingGlyphMessage, objectEditReason, selectedText } from "./ofdgo_edit.js";
 import { FontManager, FontPicker } from "./ofdgo_font.js";
 
 const MM_TO_PX = 96 / 25.4;
@@ -38,6 +38,7 @@ const state = {
 	editorInfo: null,
 	savedRevision: null,
 	insertObject: null,
+	importPageCount: 0,
 	objectClipboard: null,
 	textFonts: [],
 	textFontID: null,
@@ -114,6 +115,24 @@ const el = {
 	textFontToggle: document.querySelector("#textFontToggle"),
 	textFontList: document.querySelector("#textFontList"),
 	textFontAdd: document.querySelector("#textFontAdd"),
+	paragraphButton: document.querySelector("#paragraphButton"),
+	paragraphPanel: document.querySelector("#paragraphPanel"),
+	paragraphForm: document.querySelector("#paragraphForm"),
+	paragraphCancel: document.querySelector("#paragraphCancel"),
+	paragraphStatus: document.querySelector("#paragraphStatus"),
+	leftIndent: document.querySelector("#leftIndent"),
+	rightIndent: document.querySelector("#rightIndent"),
+	firstLineIndent: document.querySelector("#firstLineIndent"),
+	importPanel: document.querySelector("#importPanel"),
+	importForm: document.querySelector("#importForm"),
+	importFile: document.querySelector("#importFile"),
+	importRange: document.querySelector("#importRange"),
+	importPagesRow: document.querySelector("#importPagesRow"),
+	importPages: document.querySelector("#importPages"),
+	importPosition: document.querySelector("#importPosition"),
+	importStatus: document.querySelector("#importStatus"),
+	importCancel: document.querySelector("#importCancel"),
+	importSubmit: document.querySelector("#importSubmit"),
 	textSize: document.querySelector("#textSize"),
 	textColor: document.querySelector("#textColor"),
 	drawLineButton: document.querySelector("#drawLineButton"),
@@ -270,7 +289,7 @@ const canvasEditor = new CanvasEditor(el.viewerPanel, {
 	onTransform: (item, change) => changeDocument(item.items ? "ofdgoTransformObjects" : "ofdgoTransformObject", item,
 		change.x + item.x * (1 - change.scale), change.y + item.y * (1 - change.scale), change.scale),
 	onReshape: (item, box) => changeDocument("ofdgoReshapeObject", item, box.x, box.y, box.width, box.height),
-	onTextWidth: (item, box) => changeDocument("ofdgoLayoutText", item, box.x - item.x, box.width, true, item.align || "", item.paragraphHeight || 0, item.letterSpacing || 0),
+	onTextWidth: (item, box) => changeDocument("ofdgoLayoutText", item, box.x - item.x, box.width, true, item.align || "", item.paragraphHeight || 0, item.letterSpacing || 0, ...textIndents(item)),
 	onCrop: (item, box) => changeDocument("ofdgoCropImage", item, box.x, box.y, box.width, box.height),
 	onCropChange: () => {
 		updatePendingChanges();
@@ -294,7 +313,7 @@ const canvasEditor = new CanvasEditor(el.viewerPanel, {
 		box.x, box.y, box.width, box.height, style.fill, style.fillColor, style.stroke, style.strokeColor, style.lineWidth),
 	onDrawText: beginCanvasText,
 	onCommitText: (item, value, fontData) => item.draft
-		? changeDocument("ofdgoInsertText", null, item.index, value, fontData || item.fontData, item.x, item.y, item.size, item.color, item.width, item.wrap, item.align, item.paragraphHeight, item.letterSpacing)
+		? changeDocument("ofdgoInsertText", null, item.index, value, fontData || item.fontData, item.x, item.y, item.size, item.color, item.width, item.wrap, item.align, item.paragraphHeight, item.letterSpacing, ...textIndents(item))
 		: changeDocument("ofdgoUpdateText", item, value, fontData || null, item.size, null),
 	onTextChange: () => {
 		const editing = canvasEditor.input;
@@ -357,6 +376,28 @@ el.textColor.addEventListener("change", () => changeTextStyle(true));
 editorClick(el.textWrap, () => changeParagraph(!currentTextStyle().wrap));
 el.textAlign.addEventListener("change", () => changeParagraph());
 el.textLineHeight.addEventListener("change", () => changeParagraph());
+editorClick(el.paragraphButton, () => {
+	const item = currentTextStyle();
+	for (const key of ["leftIndent", "rightIndent", "firstLineIndent"]) el[key].value = item[key] || 0;
+	el.paragraphStatus.textContent = "";
+	el.paragraphPanel.showModal();
+});
+el.paragraphCancel.addEventListener("click", () => el.paragraphPanel.close());
+el.paragraphForm.addEventListener("submit", async event => {
+	event.preventDefault();
+	if (document.body.hasAttribute("aria-busy") || !el.paragraphForm.reportValidity()) return;
+	const item = currentTextStyle();
+	const indents = Object.fromEntries(["leftIndent", "rightIndent", "firstLineIndent"].map(key => [key, Number(el[key].value)]));
+	if (item === state.textDefaults) {
+		Object.assign(item, indents);
+	} else {
+		if (!confirmTextReflow(item)) return;
+		const saved = await changeDocument("ofdgoLayoutText", item, null, null, Boolean(item.wrap), item.align || "left",
+			item.paragraphHeight || 0, item.letterSpacing || 0, ...textIndents(indents));
+		if (!saved) return;
+	}
+	el.paragraphPanel.close();
+});
 el.textSpacing.addEventListener("change", () => changeParagraph());
 el.shapeWidth.addEventListener("focus", () => { el.shapeWidth.defaultValue = el.shapeWidth.value; });
 for (const input of [el.textSize, el.shapeWidth, el.textLineHeight, el.textSpacing]) {
@@ -455,10 +496,36 @@ for (const [button, tool] of [[el.drawLineButton, "line"], [el.drawRectangleButt
 for (const input of [el.shapeFill, el.shapeFillColor, el.shapeStroke, el.shapeStrokeColor, el.shapeWidth]) {
 	input.addEventListener("change", changeShapeStyle);
 }
-editorClick(el.addPageButton, () => {
+el.addPageButton.addEventListener("change", async () => {
+	const action = el.addPageButton.value;
+	el.addPageButton.value = "";
+	if (canvasEditor.input && !await canvasEditor.commitText()) return;
+	if (canvasEditor.crop && !await canvasEditor.commitCrop()) return;
+	if (action === "import") { openImportPanel(); return; }
 	const page = currentPageInfo();
 	return changeDocument("ofdgoChangePage", null, "add", state.pageIndex, page.width, page.height);
 });
+el.importCancel.addEventListener("click", () => el.importPanel.close());
+el.importPanel.addEventListener("close", () => {
+	state.importPageCount = 0;
+	el.importForm.reset();
+	if (state.ready) callWASM("ofdgoLoadImport", null).catch(err => showError(err, false));
+});
+el.importFile.addEventListener("change", loadImportFile);
+el.importRange.addEventListener("change", () => {
+	const custom = el.importRange.value === "custom";
+	el.importPagesRow.hidden = !custom;
+	el.importPages.disabled = !custom;
+	el.importPages.required = custom;
+	if (custom) el.importPages.focus();
+});
+el.importForm.addEventListener("submit", async event => {
+	event.preventDefault();
+	if (document.body.hasAttribute("aria-busy") || !state.importPageCount || !el.importForm.reportValidity()) return;
+	const position = { before:state.pageIndex, after:state.pageIndex+1, first:0, last:state.doc.pageCount }[el.importPosition.value];
+	const saved = await changeDocument("ofdgoImportPages", null, el.importRange.value === "custom" ? el.importPages.value : "", position);
+	if (saved) el.importPanel.close();
+});
 editorClick(el.copyPageButton, () => changeDocument("ofdgoChangePage", null, "copy", state.pageIndex));
 editorClick(el.deletePageButton, () => changeDocument("ofdgoChangePage", null, "delete", state.pageIndex));
 editorClick(el.movePagePrevButton, () => changeDocument("ofdgoChangePage", null, "move", state.pageIndex, state.pageIndex - 1));
@@ -712,7 +779,45 @@ function handleKeyDown(event) {
 }
 
 function formDialogOpen() {
-	return el.exportPanel.open || el.createPanel.open || el.insertPanel.open || el.pagePanel.open;
+	return el.exportPanel.open || el.createPanel.open || el.insertPanel.open || el.pagePanel.open || el.paragraphPanel.open || el.importPanel.open;
+}
+
+function openImportPanel() {
+	if (!state.editing || document.body.hasAttribute("aria-busy")) return;
+	state.importPageCount = 0;
+	el.importForm.reset();
+	el.importStatus.textContent = "";
+	el.importSubmit.disabled = true;
+	el.importPagesRow.hidden = true;
+	el.importPages.disabled = true;
+	el.importPages.required = false;
+	el.importPanel.showModal();
+}
+
+async function loadImportFile() {
+	const file = el.importFile.files[0];
+	const openSeq = state.openSeq;
+	state.importPageCount = 0;
+	el.importSubmit.disabled = true;
+	el.importStatus.textContent = "";
+	setBusy(true);
+	try {
+		const data = file ? new Uint8Array(await file.arrayBuffer()) : null;
+		if (openSeq !== state.openSeq) return;
+		const info = await callWASM("ofdgoLoadImport", data);
+		if (openSeq !== state.openSeq || !el.importPanel.open) {
+			await callWASM("ofdgoLoadImport", null);
+			return;
+		}
+		state.importPageCount = info?.pageCount || 0;
+		el.importPages.title = state.importPageCount ? `页码 1-${state.importPageCount}` : "页码";
+		el.importStatus.textContent = info?.signed ? "保留签章外观，原签名不再有效" : "";
+		el.importSubmit.disabled = !state.importPageCount;
+	} catch (err) {
+		if (openSeq === state.openSeq && el.importPanel.open) el.importStatus.textContent = err.message;
+	} finally {
+		if (openSeq === state.openSeq) setBusy(false);
+	}
 }
 
 function openPagePanel() {
@@ -943,7 +1048,11 @@ function openInsertPanel(item = null) {
 }
 
 function currentTextStyle() {
-	return canvasEditor.selected?.type === "TextObject" ? canvasEditor.selected : state.textDefaults;
+	return selectedText(canvasEditor.selected) || state.textDefaults;
+}
+
+function textIndents(item) {
+	return [item.leftIndent || 0, item.rightIndent || 0, item.firstLineIndent || 0];
 }
 
 async function toggleTextTool() {
@@ -958,10 +1067,11 @@ async function toggleTextTool() {
 		updateTextFonts(canvasEditor.selected, true);
 	}
 	if (openSeq !== state.openSeq) return;
-	const style = canEditObject(canvasEditor.selected, "layoutKnown") ? currentTextStyle() : state.textDefaults;
+	const style = !canvasEditor.selected?.items && canEditObject(canvasEditor.selected, "layoutKnown") ? currentTextStyle() : state.textDefaults;
 	const font = state.textFonts[Number(fontPicker.value)];
 	state.textDefaults = { type: "TextObject", size: style.size, color: style.color, wrap: style.wrap,
 		align: style.align || "left", paragraphHeight: style.paragraphHeight || 0, letterSpacing: style.letterSpacing || 0,
+		leftIndent: style.leftIndent || 0, rightIndent: style.rightIndent || 0, firstLineIndent: style.firstLineIndent || 0,
 		fontChoice: font && !font.disabled ? font : state.textDefaults.fontChoice };
 	state.selectObjects = true;
 	setPan(false);
@@ -1045,22 +1155,25 @@ async function readTextFont(font) {
 }
 
 function updateTextFonts(item, refresh = false) {
+	item = selectedText(item);
 	const id = item?.type === "TextObject" && !item.draft ? item.font : null;
-	if (refresh || state.textFontID !== id) {
-		state.textFontID = id;
+	const key = item?.items ? `selection:${item.items.map(member => member.id).join(",")}:${id || ""}` : id;
+	if (refresh || state.textFontID !== key) {
+		state.textFontID = key;
 		state.textFonts = editorFonts(id ? item : null);
 		const selected = canvasEditor.input?.fontChoice || (id ? state.textFonts[0] : state.textDefaults.fontChoice);
 		if (selected && (canvasEditor.input || selected.embedded)
 			&& !state.textFonts.some(font => (font.id || font.postscriptName) === (selected.id || selected.postscriptName))) {
 			state.textFonts.unshift(selected);
 		}
-		fontPicker.setFonts(state.textFonts, selected || state.textFonts[0]);
-		if (!id) state.textDefaults.fontChoice = state.textFonts[Number(fontPicker.value)];
+		fontPicker.setFonts(state.textFonts, item?.items && !id ? null : selected || state.textFonts[0]);
+		el.textFont.placeholder = item?.items && !id ? "混合" : "";
+		if (!id && !item?.items) state.textDefaults.fontChoice = state.textFonts[Number(fontPicker.value)];
 	}
 }
 
 async function changeTextFont() {
-	const item = canvasEditor.selected;
+	const item = selectedText(canvasEditor.selected);
 	const font = state.textFonts[Number(fontPicker.value)];
 	if (!state.ready || document.body.hasAttribute("aria-busy") || !font || font.disabled) return;
 	const editing = canvasEditor.input;
@@ -1069,6 +1182,7 @@ async function changeTextFont() {
 		setBusy(true);
 		try {
 			const data = await readTextFont(font);
+			await callWASM("ofdgoCheckTextFont", data, editing.input.value);
 			const face = new FontFace("ofdgo-edit-font", data);
 			await face.load();
 			if (openSeq !== state.openSeq || canvasEditor.input !== editing) return;
@@ -1084,8 +1198,8 @@ async function changeTextFont() {
 			if (openSeq === state.openSeq) setBusy(false);
 		}
 	} else if (item?.type === "TextObject") {
-		if (!font.embedded && canEditObject(item, "replaceFont")) {
-			await changeDocument("ofdgoUpdateText", item, canEditObject(item, "layoutKnown") ? item.text : null, readTextFont(font), item.size, null);
+		if (canEditObject(item, "replaceFont") && (!font.embedded || item.font !== font.id.slice(9))) {
+			await changeDocument("ofdgoStyleText", { ...item, id: (item.items || [item]).map(member => member.id) }, readTextFont(font), 0, null);
 			updateTextFonts(canvasEditor.selected, true);
 		}
 	} else {
@@ -1174,7 +1288,7 @@ async function changeParagraph(wrap = currentTextStyle().wrap) {
 		updateObjectControls(item, true);
 		return;
 	}
-	await changeDocument("ofdgoLayoutText", item, null, null, Boolean(wrap), el.textAlign.value, height, spacing);
+	await changeDocument("ofdgoLayoutText", item, null, null, Boolean(wrap), el.textAlign.value, height, spacing, ...textIndents(item));
 	updateObjectControls(canvasEditor.selected, true);
 }
 
@@ -1190,6 +1304,15 @@ async function changeTextStyle(color) {
 	}
 	const size = color || Number(el.textSize.value) === Number(el.textSize.defaultValue) ? item.size : Number(el.textSize.value) * 25.4 / 72;
 	const fill = color && el.textColor.value !== item.color ? el.textColor.value : null;
+	if (item.items) {
+		if (color ? !canEditObject(item, "update") : !canEditObject(item, "layoutKnown") || !canEditObject(item, "reflow")) return;
+		if (!color && !el.textSize.value) return;
+		if (size !== item.size || fill !== null) {
+			await changeDocument("ofdgoStyleText", { ...item, id: item.items.map(member => member.id) }, null, color ? 0 : size, fill);
+		}
+		updateObjectControls(canvasEditor.selected, true);
+		return;
+	}
 	if (item === state.textDefaults) {
 		item.size = size;
 		if (fill !== null) item.color = fill;
@@ -1314,6 +1437,10 @@ async function changeDocument(name, item, ...args) {
 		if (openSeq === state.openSeq) {
 			if (el.pagePanel.open) {
 				el.pageStatus.textContent = err.message;
+			} else if (el.paragraphPanel.open) {
+				el.paragraphStatus.textContent = err.message;
+			} else if (el.importPanel.open) {
+				el.importStatus.textContent = err.message;
 			} else {
 				showError(err, false);
 			}
@@ -1825,6 +1952,8 @@ async function openOFD(file) {
 		el.createPanel.close();
 		el.insertPanel.close();
 		el.pagePanel.close();
+		el.paragraphPanel.close();
+		el.importPanel.close();
 		updateControls();
 		await openDocument({ pageIndex: 0, resetScroll: true, openSeq });
 	} catch (err) {
@@ -3049,10 +3178,10 @@ async function pasteEditorContent(event) {
 		el.textFontAdd.focus();
 		return;
 	}
-	const style = currentTextStyle();
+	const style = canvasEditor.selected?.items ? state.textDefaults : currentTextStyle();
 	const data = readTextFont(font);
 	await changeDocument("ofdgoInsertText", null, index, value, data, x, y, style.size, style.color,
-		page.width - x * 2, style.wrap, style.align || "left", style.paragraphHeight || 0, style.letterSpacing || 0);
+		page.width - x * 2, style.wrap, style.align || "left", style.paragraphHeight || 0, style.letterSpacing || 0, ...textIndents(style));
 }
 
 function copySelection(event) {
@@ -4512,13 +4641,15 @@ function updateObjectControls(item, reset = false) {
 	el.editObjectButton.disabled = disabled || Boolean(item.items) || item.type === "PathObject"
 		|| !canEditObject(item, item.type === "TextObject" ? "reflow" : "update");
 	el.multiSelectButton.disabled = !state.editing || !canvasEditor.enabled || !state.ready || state.exporting;
-	const text = item?.type === "TextObject" ? item : state.textDefaults;
-	const textDisabled = !state.editing || !state.ready || state.exporting || Boolean(item?.items);
+	const selection = selectedText(item);
+	const text = selection || state.textDefaults;
+	const textDisabled = !state.editing || !state.ready || state.exporting || Boolean(item?.items && !selection);
 	fontPicker.setDisabled(textDisabled || text !== state.textDefaults && !item.draft && !canEditObject(item, "replaceFont"));
-	el.textSize.disabled = textDisabled || Boolean(item?.draft) || text !== state.textDefaults && !canEditObject(item, "reflow");
+	el.textSize.disabled = textDisabled || Boolean(item?.draft) || text !== state.textDefaults && (!canEditObject(item, "reflow") || Boolean(item?.items) && !canEditObject(item, "layoutKnown"));
 	el.textColor.disabled = textDisabled || Boolean(item?.draft) || text !== state.textDefaults && !canEditObject(item, "update");
 	el.textFontAdd.disabled = !state.editing || !state.ready || state.exporting;
-	el.textAlign.disabled = el.textWrap.disabled = el.textLineHeight.disabled = el.textSpacing.disabled = el.textSize.disabled;
+	el.textAlign.disabled = el.textWrap.disabled = el.textLineHeight.disabled = el.textSpacing.disabled = el.textSize.disabled || Boolean(item?.items);
+	el.paragraphButton.disabled = el.textAlign.disabled;
 	const layoutKnown = text === state.textDefaults || Boolean(item?.draft) || canEditObject(item, "layoutKnown");
 	el.textAlign.value = layoutKnown ? text.align || "left" : "";
 	el.textLineHeight.placeholder = layoutKnown ? "自动" : "原文";
@@ -4532,10 +4663,13 @@ function updateObjectControls(item, reset = false) {
 	}
 	updateTextFonts(item);
 	if (reset || el.textSize.disabled || document.activeElement !== el.textSize) {
-		el.textSize.value = document.activeElement === el.textSize ? textPoints(text.size) : Math.round(textPoints(text.size));
+		el.textSize.value = text.size === undefined ? "" : document.activeElement === el.textSize ? textPoints(text.size) : Math.round(textPoints(text.size));
 		el.textSize.defaultValue = el.textSize.value;
 	}
-	el.textSize.title = `字号 ${textPoints(text.size)} pt`;
+	el.textSize.placeholder = text.size === undefined ? "混合" : "";
+	el.textSize.title = text.size === undefined ? "字号：混合" : `字号 ${textPoints(text.size)} pt`;
+	el.textColor.classList.toggle("mixed-color", Boolean(selection?.items && !text.color));
+	el.textColor.title = selection?.items && !text.color ? "文字颜色：混合" : "文字颜色";
 	if (reset || el.textColor.disabled || document.activeElement !== el.textColor) {
 		el.textColor.value = text.color || "#000000";
 	}
@@ -4589,6 +4723,7 @@ async function callWASM(name, ...args) {
 				args[0] = args[0].slice();
 				transfer.push(args[0].buffer);
 			}
+			if (name === "ofdgoLoadImport" && args[0]) transfer.push(args[0].buffer);
 			wasmWorker.postMessage({ id, name, args }, transfer);
 		} catch (err) {
 			wasmRequests.delete(id);
@@ -4610,6 +4745,8 @@ function setBusy(busy, text = "", percent = 0, status = "") {
 	el.createForm.inert = busy;
 	el.insertForm.inert = busy;
 	el.pageForm.inert = busy;
+	el.paragraphForm.inert = busy;
+	el.importForm.inert = busy;
 	el.editorTools.inert = busy;
 	el.fontList.inert = busy;
 	if (!busy) {
diff --git a/assets/webui/ofdgo_edit.js b/assets/webui/ofdgo_edit.js
index f0c5548..ca37b70 100644
--- a/assets/webui/ofdgo_edit.js
+++ b/assets/webui/ofdgo_edit.js
@@ -131,22 +131,29 @@ export function missingGlyphMessage(diagnostic) {
 }
 
 export function objectEditReason(item) {
+	const labels = { fontUnavailable: "字体不可用", unsupportedColor: "颜色样式暂不支持", unsupportedStyle: "绘制参数暂不支持",
+		unsupportedContainer: "容器特性暂不支持", invalidObject: "对象数据异常" };
 	const reasons = (item?.items || (item ? [item] : [])).map(object => {
 		const reason = object.capabilities?.reason || "";
 		if (!reason) return "";
-		let message = "对象特性暂不支持";
+		let message = labels[object.capabilities.reasonCode] || "对象特性暂不支持";
 		if (object.capabilities.missingGlyphs) message = missingGlyphMessage(object.capabilities.missingGlyphs);
-		else if (reason.includes("embedded font")) message = "缺少内嵌字体";
-		else if (reason.includes("color") || reason.includes("RGB")) message = "颜色样式暂不支持";
-		else if (reason.includes("draw parameter")) message = "绘制参数暂不支持";
-		else if (reason.includes("layer")) message = "图层特性暂不支持";
-		else if (reason.includes("container")) message = "容器特性暂不支持";
-		else if (reason.includes("invalid")) message = "对象数据异常";
 		return `${object.capabilities.transform ? "部分操作受限" : "暂不可编辑"}：${message}`;
 	});
 	return [...new Set(reasons.filter(Boolean))].join("；");
 }
 
+export function selectedText(item) {
+	if (!item?.items) return item?.type === "TextObject" ? item : null;
+	if (!item.items.every(member => member.type === "TextObject")) return null;
+	const text = { ...item, type: "TextObject" };
+	for (const key of ["font", "fontName", "size", "color"]) {
+		const value = item.items[0][key];
+		text[key] = item.items.every(member => member[key] === value) ? value : undefined;
+	}
+	return text;
+}
+
 export class CanvasEditor {
 	constructor(viewer, options) {
 		this.viewer = viewer;
@@ -803,6 +810,9 @@ export class CanvasEditor {
 			lineHeight: item.paragraphHeight || item.lineHeight ? `${(item.paragraphHeight || item.lineHeight) * PX_PER_MM}px` : "normal", color: item.color,
 			textAlign: item.align || "left",
 			letterSpacing: `${(item.letterSpacing || 0) * PX_PER_MM}px`,
+			paddingLeft: `${2 + Math.max(0, item.leftIndent || 0) * PX_PER_MM}px`,
+			paddingRight: `${2 + Math.max(0, item.rightIndent || 0) * PX_PER_MM}px`,
+			textIndent: `${(item.firstLineIndent || 0) * PX_PER_MM}px`,
 		});
 		if (item.textFrame) {
 			const { width, height, matrix: [a, b, c, d, e, f] } = item.textFrame;
diff --git a/assets/webui/ofdgo_font.js b/assets/webui/ofdgo_font.js
index 246e4fc..6fe8e5a 100644
--- a/assets/webui/ofdgo_font.js
+++ b/assets/webui/ofdgo_font.js
@@ -32,7 +32,7 @@ export class FontPicker {
 			this.names.set(name, (this.names.get(name) || 0) + 1);
 		}
 		const key = font => font?.id || font?.postscriptName;
-		this.value = fonts.length ? String(Math.max(0, fonts.findIndex(font => key(font) === key(selected)))) : "";
+		this.value = !fonts.length ? "" : selected === null ? "-1" : String(Math.max(0, fonts.findIndex(font => key(font) === key(selected))));
 		this.restore();
 	}
 
diff --git a/internal/webui/wasm.go b/internal/webui/wasm.go
index f6fbdd0..ff8ce86 100644
--- a/internal/webui/wasm.go
+++ b/internal/webui/wasm.go
@@ -28,6 +28,7 @@ import (
 	"io"
 	"math"
 	"strconv"
+	"strings"
 	"syscall/js"
 
 	"github.com/xiaoqidun/ofdgo"
@@ -76,12 +77,16 @@ func awaitExport(fn js.Value, args ...any) error {
 // currentSession 当前WebUI文档会话
 var currentSession *Session
 
+// pendingImport 待插页文档，仅保留文件数据与索引，不创建渲染会话
+var pendingImport *ofdgo.Reader
+
 // apiResult 浏览器接口返回结果
 type apiResult struct {
 	OK            bool                     `json:"ok"`
 	Error         string                   `json:"error,omitempty"`
 	Data          any                      `json:"data,omitempty"`
 	MissingGlyphs *ofdgo.MissingGlyphError `json:"missingGlyphs,omitempty"`
+	ReasonCode    ofdgo.EditReason         `json:"reasonCode,omitempty"`
 }
 
 // RunWASM 注册浏览器WASM接口并阻塞运行
@@ -104,8 +109,12 @@ func RunWASM() {
 	registerCallback("ofdgoCreateDocument", createDocument)
 	registerCallback("ofdgoEditDocument", editDocument)
 	registerCallback("ofdgoChangePage", changePage)
+	registerCallback("ofdgoLoadImport", loadImport)
+	registerCallback("ofdgoImportPages", importPages)
 	registerCallback("ofdgoInsertText", insertText)
 	registerCallback("ofdgoUpdateText", updateText)
+	registerCallback("ofdgoStyleText", styleText)
+	registerCallback("ofdgoCheckTextFont", checkTextFont)
 	registerCallback("ofdgoInsertImage", insertImage)
 	registerCallback("ofdgoInsertShape", insertShape)
 	registerCallback("ofdgoUpdatePathStyle", updatePathStyle)
@@ -170,7 +179,13 @@ func callbackResult(fn func([]js.Value) (any, error), args []js.Value) any {
 	data, err := safeCall(fn, args)
 	if err != nil {
 		result := apiResult{Error: err.Error()}
-		errors.As(err, &result.MissingGlyphs)
+		var failure *ofdgo.EditError
+		if errors.As(err, &failure) {
+			result.ReasonCode = failure.Code
+		}
+		if errors.As(err, &result.MissingGlyphs) {
+			result.ReasonCode = ofdgo.EditMissingGlyphs
+		}
 		return encodeResult(result)
 	}
 	if result, ok := data.(js.Value); ok {
@@ -207,6 +222,7 @@ func openDocument(args []js.Value) (any, error) {
 		return nil, err
 	}
 	renderAnnotations := args[2].Bool()
+	clearImport()
 	currentEditor = nil
 	copiedObjects = nil
 	if currentSession != nil {
@@ -701,7 +717,7 @@ func editorObjects(index int, text *ofdgo.PageText) ([]any, error) {
 					return nil, err
 				}
 				item := map[string]any{"id": id, "type": object.Type, "x": box.X, "y": box.Y, "width": box.W, "height": box.H, "order": order, "position": position.Index, "count": position.Count, "container": position.Container,
-					"capabilities": map[string]any{"update": capability.Update, "replaceFont": capability.ReplaceFont, "reflow": capability.Reflow, "layoutKnown": capability.LayoutKnown, "transform": capability.Transform, "arrange": capability.Arrange, "copy": capability.Copy, "delete": capability.Delete, "order": capability.Order, "reason": capability.Reason}}
+					"capabilities": map[string]any{"update": capability.Update, "replaceFont": capability.ReplaceFont, "reflow": capability.Reflow, "layoutKnown": capability.LayoutKnown, "transform": capability.Transform, "arrange": capability.Arrange, "copy": capability.Copy, "delete": capability.Delete, "order": capability.Order, "reason": capability.Reason, "reasonCode": string(capability.ReasonCode)}}
 				if missing := capability.MissingGlyphs; missing != nil {
 					item["capabilities"].(map[string]any)["missingGlyphs"] = map[string]any{"fontID": missing.FontID, "characters": missing.Characters}
 				}
@@ -729,6 +745,7 @@ func editorObjects(index int, text *ofdgo.PageText) ([]any, error) {
 					item["text"], item["font"], item["fontName"], item["size"] = value, object.TextObject.Font, fontNames[object.TextObject.Font], object.TextObject.Size
 					item["wrap"], item["align"], item["paragraphHeight"] = layout.Wrap, layout.Align, layout.LineHeight
 					item["letterSpacing"] = layout.LetterSpacing
+					item["leftIndent"], item["rightIndent"], item["firstLineIndent"] = layout.LeftIndent, layout.RightIndent, layout.FirstLineIndent
 					if capability.Reflow {
 						frame, err := object.TextObject.TextFrame()
 						if err != nil {
@@ -992,10 +1009,79 @@ func changePage(args []js.Value) (any, error) {
 	return editorPageInfo{info, index}, nil
 }
 
+// clearImport 释放待插页文档
+func clearImport() {
+	if pendingImport != nil {
+		_ = pendingImport.Close()
+		pendingImport = nil
+	}
+}
+
+// loadImport 加载待插页文件的索引，null参数清除待处理文件
+// 入参: args OFD字节数组或null
+// 返回: any 页数及签名提示, error 错误信息
+func loadImport(args []js.Value) (any, error) {
+	clearImport()
+	if args[0].IsNull() {
+		return nil, nil
+	}
+	data, err := bytesFromJS(args[0])
+	if err != nil {
+		return nil, err
+	}
+	reader, err := ofdgo.NewReader(bytes.NewReader(data), int64(len(data)))
+	if err != nil {
+		return nil, err
+	}
+	doc, err := reader.Doc()
+	if err != nil {
+		reader.Close()
+		return nil, err
+	}
+	if len(doc.Pages.Page) == 0 {
+		reader.Close()
+		return nil, fmt.Errorf("document has no pages")
+	}
+	pendingImport = reader
+	return map[string]any{"pageCount": len(doc.Pages.Page), "signed": doc.Signatures != ""}, nil
+}
+
+// importPages 插入指定来源页面并保持目标文档元数据
+// 入参: args 页码表达式，空值为全部，以及目标零基插入位置
+// 返回: any 文档信息及首个插入页, error 错误信息
+func importPages(args []js.Value) (any, error) {
+	if currentEditor == nil || pendingImport == nil {
+		return nil, fmt.Errorf("no document is ready for page import")
+	}
+	doc, err := pendingImport.Doc()
+	if err != nil {
+		return nil, err
+	}
+	var indexes []int
+	if value := strings.TrimSpace(args[0].String()); value != "" {
+		indexes, err = ofdgo.ParsePageRange(value, len(doc.Pages.Page))
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		for i := range doc.Pages.Page {
+			indexes = append(indexes, i)
+		}
+	}
+	at := args[1].Int()
+	if _, err := currentEditor.ImportPages(pendingImport, indexes, at); err != nil {
+		return nil, err
+	}
+	clearImport()
+	info, err := previewEditor(currentEditor, currentSession.Renderer.RenderAnnotations)
+	return editorPageInfo{info, at}, err
+}
+
 // createDocument 新建单页文档
 // 入参: args 标题、纸张宽高和注解设置
 // 返回: any 文档信息, error 错误信息
 func createDocument(args []js.Value) (any, error) {
+	clearImport()
 	editor := ofdgo.NewEditor()
 	editor.Info.Title = args[0].String()
 	if _, err := editor.AddPage(args[1].Float(), args[2].Float()); err != nil {
@@ -1070,6 +1156,13 @@ func updateText(args []js.Value) (any, error) {
 		if err != nil {
 			return nil, err
 		}
+		value := object.TextObject.Text()
+		if !args[2].IsNull() {
+			value = args[2].String()
+		}
+		if err := checkFontGlyphs(data, value); err != nil {
+			return nil, err
+		}
 		object.TextObject.Font, err = currentEditor.AddFont(FontFile{Data: data}, 0)
 		if err != nil {
 			return nil, err
@@ -1097,6 +1190,73 @@ func updateText(args []js.Value) (any, error) {
 	return previewEditor(currentEditor, currentSession.Renderer.RenderAnnotations)
 }
 
+// checkFontGlyphs 只检查候选字体，不注册资源或改变文档
+// 入参: data 字体数据, value 待替换文字
+// 返回: error 缺字或字体格式错误
+func checkFontGlyphs(data []byte, value string) error {
+	missing, err := (FontFile{Data: data}).MissingGlyphs(0, value)
+	if err != nil {
+		return err
+	}
+	if missing != "" {
+		return &ofdgo.MissingGlyphError{Characters: missing}
+	}
+	return nil
+}
+
+// checkTextFont 为画布输入预检候选字体
+// 入参: args 字体数据和输入文字
+// 返回: any 空结果, error 缺字或字体格式错误
+func checkTextFont(args []js.Value) (any, error) {
+	data, err := bytesFromJS(args[0])
+	if err != nil {
+		return nil, err
+	}
+	return nil, checkFontGlyphs(data, args[1].String())
+}
+
+// styleText 批量修改文字样式，字体预检通过后交由库原子提交
+// 入参: args 页码、对象标识、字体数据、字号和颜色，null字体与颜色保持原值
+// 返回: any 文档信息, error 错误信息
+func styleText(args []js.Value) (any, error) {
+	return changeObjects(func() error {
+		page, ids := args[0].Int(), stringsFromJS(args[1])
+		style := ofdgo.TextStyle{Size: args[3].Float()}
+		if !args[2].IsNull() {
+			data, err := bytesFromJS(args[2])
+			if err != nil {
+				return err
+			}
+			var value strings.Builder
+			for _, id := range ids {
+				object, err := currentEditor.Object(page, id)
+				if err != nil {
+					return err
+				}
+				if object.Type != "TextObject" {
+					return fmt.Errorf("object %q is not text", id)
+				}
+				value.WriteString(object.TextObject.Text())
+			}
+			if err := checkFontGlyphs(data, value.String()); err != nil {
+				return err
+			}
+			style.Font, err = currentEditor.AddFont(FontFile{Data: data}, 0)
+			if err != nil {
+				return err
+			}
+		}
+		if !args[4].IsNull() {
+			var color ofdgo.FillColor
+			if err := setEditorColor(&color, args[4].String()); err != nil {
+				return err
+			}
+			style.Color = color.Value
+		}
+		return currentEditor.StyleText(page, ids, style)
+	})
+}
+
 // setTextColor 将浏览器RGB色值写入文字对象，保留颜色透明度
 // 入参: object 文字对象, value 十六进制色值
 // 返回: error 错误信息
@@ -1223,7 +1383,7 @@ func updatePathStyle(args []js.Value) (any, error) {
 }
 
 // insertText 使用选定字体创建文字对象
-// 入参: args 页码、内容、字体数据、横纵坐标、字号、颜色、框宽、折行、对齐、行距和字距
+// 入参: args 页码、内容、字体数据、横纵坐标、字号、颜色、框宽、折行、对齐、行距、字距及左右和首行缩进
 // 返回: any 文档信息, error 错误信息
 func insertText(args []js.Value) (any, error) {
 	if currentEditor == nil {
@@ -1256,7 +1416,7 @@ func insertText(args []js.Value) (any, error) {
 		Boundary: fmt.Sprintf("%g %g %g %g", box.X, box.Y, box.W, box.H),
 		Font:     fontID, Size: args[5].Float(),
 	}}
-	if err := currentEditor.LayoutText(&object.TextObject, args[1].String(), ofdgo.TextLayout{Wrap: args[8].Bool(), Align: args[9].String(), LineHeight: args[10].Float(), LetterSpacing: args[11].Float()}); err != nil {
+	if err := currentEditor.LayoutText(&object.TextObject, args[1].String(), ofdgo.TextLayout{Wrap: args[8].Bool(), Align: args[9].String(), LineHeight: args[10].Float(), LetterSpacing: args[11].Float(), LeftIndent: args[12].Float(), RightIndent: args[13].Float(), FirstLineIndent: args[14].Float()}); err != nil {
 		return nil, err
 	}
 	if err := setTextColor(&object.TextObject, args[6].String()); err != nil {
@@ -1269,7 +1429,7 @@ func insertText(args []js.Value) (any, error) {
 }
 
 // layoutText 调整文字框和段落排版，保留软换行前的原文
-// 入参: args 页码、对象标识、本地左侧偏移、宽度、折行、对齐、行距和字距
+// 入参: args 页码、对象标识、本地左侧偏移、宽度、折行、对齐、行距、字距及左右和首行缩进
 // 返回: any 文档信息, error 错误信息
 func layoutText(args []js.Value) (any, error) {
 	if currentEditor == nil {
@@ -1290,7 +1450,7 @@ func layoutText(args []js.Value) (any, error) {
 		}
 	}
 	value, _ := object.TextObject.TextLayout()
-	if err := currentEditor.LayoutText(&object.TextObject, value, ofdgo.TextLayout{Wrap: args[4].Bool(), Align: args[5].String(), LineHeight: args[6].Float(), LetterSpacing: args[7].Float()}); err != nil {
+	if err := currentEditor.LayoutText(&object.TextObject, value, ofdgo.TextLayout{Wrap: args[4].Bool(), Align: args[5].String(), LineHeight: args[6].Float(), LetterSpacing: args[7].Float(), LeftIndent: args[8].Float(), RightIndent: args[9].Float(), FirstLineIndent: args[10].Float()}); err != nil {
 		return nil, err
 	}
 	revision := currentEditor.Revision()
diff --git a/ofdgo_editor.go b/ofdgo_editor.go
index 8060cf3..f4712a8 100644
--- a/ofdgo_editor.go
+++ b/ofdgo_editor.go
@@ -606,7 +606,7 @@ func (e *Editor) prepareObject(id string, object GraphicObject) (GraphicObject,
 	}
 	for _, color := range []*FillColor{fill, stroke} {
 		if err := creationColor(color); err != nil {
-			return GraphicObject{}, err
+			return GraphicObject{}, &EditError{Code: EditUnsupportedColor, Err: err}
 		}
 	}
 	if join != "" && join != "Miter" && join != "Round" && join != "Bevel" {
@@ -725,6 +725,9 @@ func transformEditorObject(object GraphicObject, dx, dy, scale float64) (Graphic
 				layout := *obj.layout
 				layout.options.LineHeight *= scale
 				layout.options.LetterSpacing *= scale
+				layout.options.LeftIndent *= scale
+				layout.options.RightIndent *= scale
+				layout.options.FirstLineIndent *= scale
 				obj.layout = &layout
 			}
 			if obj.LineWidth == 0 && obj.Stroke != nil && *obj.Stroke {
@@ -821,7 +824,7 @@ func (e *Editor) LayoutText(obj *TextObject, value string, options TextLayout) e
 	}
 	sfnt, err := e.editorFont(obj.Font)
 	if err != nil {
-		return fmt.Errorf("font resource %q not found", obj.Font)
+		return err
 	}
 	if !finite(obj.Size) || obj.Size <= 0 || !finite(obj.HScale) || obj.HScale < 0 {
 		return fmt.Errorf("invalid text dimensions")
@@ -837,16 +840,22 @@ func (e *Editor) LayoutText(obj *TextObject, value string, options TextLayout) e
 	if !finite(options.LetterSpacing) {
 		return fmt.Errorf("letter spacing must be finite")
 	}
+	if !finite(options.LeftIndent) || !finite(options.RightIndent) || !finite(options.FirstLineIndent) {
+		return fmt.Errorf("paragraph indents must be finite")
+	}
 	if !slices.Contains([]string{"", "left", "center", "right", "justify"}, options.Align) {
 		return fmt.Errorf("invalid text alignment %q", options.Align)
 	}
 	var width float64
-	if options.Wrap || options.Align != "" && options.Align != "left" {
+	if options.Wrap || options.Align != "" && options.Align != "left" || options.LeftIndent != 0 || options.RightIndent != 0 || options.FirstLineIndent != 0 {
 		box, err := obj.TextFrame()
 		if err != nil {
 			return err
 		}
-		width = box.W
+		width = box.W - options.LeftIndent - options.RightIndent
+		if !finite(width) || width <= 0 || !finite(width-options.FirstLineIndent) || width-options.FirstLineIndent <= 0 {
+			return fmt.Errorf("paragraph indents leave no text width")
+		}
 	}
 	hScale := obj.HScale
 	if hScale == 0 {
@@ -879,9 +888,14 @@ func (e *Editor) LayoutText(obj *TextObject, value string, options TextLayout) e
 				return fmt.Errorf("text advance exceeds finite range")
 			}
 		}
-		lines := breakTextLines(runes, advances, width, options.Wrap, options.LetterSpacing)
+		lines := breakTextLines(runes, advances, width, options.Wrap, options.LetterSpacing, options.FirstLineIndent)
 		for i, line := range lines {
-			x, deltas := alignTextLine(runes[line[0]:line[1]], advances[line[0]:line[1]], width, options.Align, i+1 < len(lines), options.LetterSpacing)
+			indent := 0.0
+			if i == 0 {
+				indent = options.FirstLineIndent
+			}
+			x, deltas := alignTextLine(runes[line[0]:line[1]], advances[line[0]:line[1]], width-indent, options.Align, i+1 < len(lines), options.LetterSpacing)
+			x += options.LeftIndent + indent
 			y := float64(ascender)*unit + float64(len(codes))*lineHeight
 			if !finite(x) || !finite(y) {
 				return fmt.Errorf("text position exceeds finite range")
@@ -905,14 +919,17 @@ func (e *Editor) LayoutText(obj *TextObject, value string, options TextLayout) e
 // 返回: error 错误信息
 func (e *Editor) prepareText(obj *TextObject) error {
 	sfnt, err := e.editorFont(obj.Font)
-	if err != nil || !finite(obj.Size) || obj.Size <= 0 {
+	if err != nil {
+		return err
+	}
+	if !finite(obj.Size) || obj.Size <= 0 {
 		return fmt.Errorf("text requires an embedded font and a positive finite size")
 	}
 	if len(obj.TextCode) == 0 {
 		return fmt.Errorf("text codes are empty")
 	}
 	if obj.VScale != 0 || obj.Decoration != "" || len(obj.CGTransform) != 0 {
-		return fmt.Errorf("text extensions and glyph transforms are not supported for creation")
+		return &EditError{Code: EditUnsupportedObject, Err: fmt.Errorf("text extensions and glyph transforms are not supported for creation")}
 	}
 	if !finite(obj.HScale) || obj.HScale < 0 || !finite(obj.LineWidth) || obj.LineWidth < 0 || !finite(obj.MiterLimit) || obj.MiterLimit < 0 {
 		return fmt.Errorf("invalid text dimensions")
diff --git a/ofdgo_editor_error.go b/ofdgo_editor_error.go
new file mode 100644
index 0000000..f3fe5aa
--- /dev/null
+++ b/ofdgo_editor_error.go
@@ -0,0 +1,70 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import "errors"
+
+// EditReason 编辑操作受限的原因，不依赖错误描述的语言或文案
+type EditReason string
+
+const (
+	// EditUnsupportedObject 对象包含尚不支持编辑的特性
+	EditUnsupportedObject EditReason = "unsupportedObject"
+	// EditUnsupportedContainer 所在容器包含尚不支持编辑的特性
+	EditUnsupportedContainer EditReason = "unsupportedContainer"
+	// EditUnsupportedColor 颜色表达方式暂不支持编辑
+	EditUnsupportedColor EditReason = "unsupportedColor"
+	// EditUnsupportedStyle 绘制样式暂不支持编辑
+	EditUnsupportedStyle EditReason = "unsupportedStyle"
+	// EditFontUnavailable 对象所需字体不可用
+	EditFontUnavailable EditReason = "fontUnavailable"
+	// EditMissingGlyphs 字体缺少文字所需字形
+	EditMissingGlyphs EditReason = "missingGlyphs"
+	// EditInvalidObject 对象数据未通过校验
+	EditInvalidObject EditReason = "invalidObject"
+)
+
+// EditError 编辑受限原因及原始错误，可通过errors.As取得Code和更具体的诊断
+type EditError struct {
+	Code EditReason
+	Err  error
+}
+
+// Error 保留原始错误描述
+// 返回: string 错误描述
+func (e *EditError) Error() string {
+	return e.Err.Error()
+}
+
+// Unwrap 保留原始错误链
+// 返回: error 原始错误
+func (e *EditError) Unwrap() error {
+	return e.Err
+}
+
+// editReason 提取编辑错误分类，未分类的校验错误作为对象数据异常
+// 入参: err 校验错误
+// 返回: EditReason 原因
+func editReason(err error) EditReason {
+	var missing *MissingGlyphError
+	if errors.As(err, &missing) {
+		return EditMissingGlyphs
+	}
+	var failure *EditError
+	if errors.As(err, &failure) {
+		return failure.Code
+	}
+	return EditInvalidObject
+}
diff --git a/ofdgo_editor_import.go b/ofdgo_editor_import.go
new file mode 100644
index 0000000..f288851
--- /dev/null
+++ b/ofdgo_editor_import.go
@@ -0,0 +1,818 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bytes"
+	"encoding/xml"
+	"fmt"
+	"maps"
+	"path"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+// editorImportEntry 资源或关联索引节点及其来源
+type editorImportEntry struct {
+	name, base, group string
+	data              []byte
+	node              *editorXML
+}
+
+// editorPageImport 一次插页操作的独立资源图，提交前不修改目标文档
+type editorPageImport struct {
+	reader        *Reader
+	doc           *Document
+	prefix        string
+	maximum       int
+	ids           map[string]string
+	pages         map[string]bool
+	files         map[string][]byte
+	resources     map[string]editorImportEntry
+	used          map[string][]byte
+	templates     map[string]TemplatePage
+	templateParts map[string][]byte
+	defaultCS     string
+	attachments   map[string][]byte
+}
+
+// ImportPages 将来源主文档中的指定页面插入目标位置，保持输入顺序并作为一次撤销操作
+// 页面索引从0开始，at可等于当前页数；复制关联模板、注释、签章外观和实际引用的资源
+// 不导入来源元数据和目录，指向未选页面的跳转被移除；签名数据仅保留原始凭据，不代表合并后文档有效
+// 返回后可关闭来源Reader，目标原Reader的生命周期要求不变
+// 入参: source 来源阅读器, indexes 来源页面索引，不可重复, at 目标插入位置
+// 返回: []string 新页面标识, error 错误信息
+func (e *Editor) ImportPages(source *Reader, indexes []int, at int) ([]string, error) {
+	if at < 0 || at > len(e.pages) {
+		return nil, fmt.Errorf("page index %d out of range", at)
+	}
+	doc, err := source.Doc()
+	if err != nil {
+		return nil, err
+	}
+	selected := make(map[string]bool)
+	for _, index := range indexes {
+		if index < 0 || index >= len(doc.Pages.Page) {
+			return nil, fmt.Errorf("source page index %d out of range", index)
+		}
+		id := doc.Pages.Page[index].ID
+		if selected[id] {
+			return nil, fmt.Errorf("duplicate source page %q", id)
+		}
+		selected[id] = true
+	}
+	if len(indexes) == 0 {
+		return nil, nil
+	}
+	if err := e.prepareSourceIDs(); err != nil {
+		return nil, err
+	}
+	base := e.source
+	if base == nil {
+		base, err = e.importBase()
+		if err != nil {
+			return nil, err
+		}
+	}
+	prefix := path.Join(base.directory, "Import_"+strconv.Itoa(e.maxID+1))
+	for editorDirectoryExists(base.reader, prefix) {
+		prefix += "_"
+	}
+	m := &editorPageImport{reader: source, doc: doc, prefix: prefix, maximum: e.maxID,
+		ids: make(map[string]string), pages: selected, files: make(map[string][]byte), resources: make(map[string]editorImportEntry), used: make(map[string][]byte), templates: make(map[string]TemplatePage), templateParts: make(map[string][]byte), attachments: make(map[string][]byte)}
+	for _, name := range append(slices.Clone(doc.CommonData.PublicRes), doc.CommonData.DocumentRes...) {
+		if err := m.resourceIndex(source.ResPath(name)); err != nil {
+			return nil, err
+		}
+	}
+	for _, template := range doc.CommonData.TemplatePage {
+		m.templates[template.ID] = template
+	}
+	if doc.CommonData.DefaultCS != 0 {
+		m.defaultCS, err = m.reference(strconv.Itoa(doc.CommonData.DefaultCS))
+		if err != nil {
+			return nil, err
+		}
+	} else if !e.sourceRGB() {
+		m.defaultCS = m.id("defaultRGB")
+		m.used["defaultRGB"] = []byte(`<ofd:ColorSpace ID="` + m.defaultCS + `" Type="RGB" BitsPerComponent="8"/>`)
+		m.resources["defaultRGB"] = editorImportEntry{group: "ColorSpaces"}
+	}
+	refs := make([]Page, len(indexes))
+	ids := make([]string, len(indexes))
+	for i, index := range indexes {
+		page := doc.Pages.Page[index]
+		ids[i] = m.id(page.ID)
+		name, err := m.copyXML(source.ResPath(page.BaseLoc))
+		if err != nil {
+			return nil, err
+		}
+		refs[i] = Page{ID: ids[i], BaseLoc: name}
+	}
+	annotations, err := m.annotations()
+	if err != nil {
+		return nil, err
+	}
+	signatures, err := m.signatures()
+	if err != nil {
+		return nil, err
+	}
+	var resourceContent []byte
+	for _, group := range []string{"ColorSpaces", "DrawParams", "Fonts", "MultiMedias", "CompositeGraphicUnits"} {
+		var entries []byte
+		for _, id := range slices.Sorted(maps.Keys(m.used)) {
+			if m.resources[id].group == group {
+				entries = append(entries, m.used[id]...)
+			}
+		}
+		if len(entries) == 0 {
+			continue
+		}
+		encoded, err := editorXMLContainer(group, nil, entries)
+		if err != nil {
+			return nil, err
+		}
+		resourceContent = append(resourceContent, encoded...)
+	}
+	resources, err := editorXMLContainer("Res", nil, resourceContent)
+	if err != nil {
+		return nil, err
+	}
+	m.files[path.Join(prefix, "Resources.xml")] = resources
+	next, err := m.merge(base, refs, annotations, signatures)
+	if err != nil {
+		return nil, err
+	}
+	added := make([]PageContent, len(refs))
+	for i, ref := range refs {
+		added[i] = PageContent{ID: ref.ID}
+	}
+	if e.source == nil {
+		for i := range e.resources {
+			resource := &e.resources[i]
+			if resource.font != nil {
+				resource.font = cloneEditorData(resource.font)
+				resource.font.FontFile = "/" + resource.name
+			}
+			if resource.image != nil {
+				resource.image = cloneEditorData(resource.image)
+				resource.image.MediaFile = "/" + resource.name
+			}
+		}
+	}
+	e.source, e.maxID = next, m.maximum
+	e.pages = slices.Insert(e.pages, at, added...)
+	if change := e.recordChange(); change != nil {
+		change.undo = func(e *Editor) {
+			for i := range added {
+				added[i] = copyEditorPage(e.pages[at+i])
+			}
+			e.pages = slices.Delete(e.pages, at, at+len(added))
+			e.source = base
+		}
+		change.redo = func(e *Editor) {
+			pages := make([]PageContent, len(added))
+			for i := range added {
+				pages[i] = copyEditorPage(added[i])
+			}
+			e.pages = slices.Insert(e.pages, at, pages...)
+			e.source = next
+		}
+	}
+	return ids, nil
+}
+
+// importBase 为新建文档提供空的保真包基底，不重复保存已创建的页面和资源
+// 返回: *editorSource 包基底, error 错误信息
+func (e *Editor) importBase() (*editorSource, error) {
+	seed := NewEditor()
+	seed.Info = e.Info
+	seed.pages = []PageContent{{Area: PageArea{PhysicalBox: "0 0 210 297"}}}
+	files := make(map[string][]byte)
+	if err := seed.writeParts(func(name string, data []byte, _ bool) error {
+		if name == "OFD.xml" || name == "Doc_0/Document.xml" {
+			files[name] = data
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+	data := files["Doc_0/Document.xml"]
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return nil, err
+	}
+	files["Doc_0/Document.xml"] = editorPatchXML(data, []editorXMLPatch{editorXMLContent(data, root.child("Pages"), nil)})
+	reader := &Reader{files: files}
+	if err := reader.initRoot(); err != nil {
+		return nil, err
+	}
+	editor, err := reader.Editor()
+	if err != nil {
+		return nil, err
+	}
+	editor.source.idsReady = true
+	return editor.source, nil
+}
+
+// id 为来源标识分配稳定且不与目标冲突的新标识
+// 入参: value 来源标识
+// 返回: string 新标识
+func (m *editorPageImport) id(value string) string {
+	if id := m.ids[value]; id != "" {
+		return id
+	}
+	m.maximum++
+	id := strconv.Itoa(m.maximum)
+	m.ids[value] = id
+	return id
+}
+
+// resourceIndex 登记资源定义，按引用延迟复制资源内容
+// 入参: name 资源索引路径
+// 返回: error 错误信息
+func (m *editorPageImport) resourceIndex(name string) error {
+	data, err := m.reader.readFile(name)
+	if err != nil {
+		return err
+	}
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return err
+	}
+	if root.name.Local != "Res" {
+		return fmt.Errorf("invalid resource index %q", name)
+	}
+	for _, group := range root.children {
+		for _, node := range group.children {
+			m.resources[node.attr("ID")] = editorImportEntry{name: name, base: root.attr("BaseLoc"), group: group.name.Local, data: data, node: node}
+		}
+	}
+	return nil
+}
+
+// reference 复制被引用的资源及其传递依赖
+// 入参: value 来源资源标识
+// 返回: string 新标识, error 错误信息
+func (m *editorPageImport) reference(value string) (string, error) {
+	if entry, ok := m.resources[value]; ok {
+		if _, seen := m.used[value]; !seen {
+			m.used[value] = nil
+			data, err := m.encode(entry, entry.node)
+			if err != nil {
+				return "", err
+			}
+			m.used[value] = data
+		}
+	}
+	if template, ok := m.templates[value]; ok {
+		if _, seen := m.templateParts[value]; !seen {
+			m.templateParts[value] = nil
+			name, err := m.copyXML(m.reader.ResPath(template.BaseLoc))
+			if err != nil {
+				return "", err
+			}
+			data, err := editorXMLContainer("TemplatePage", ofdAttrs{{Name: xml.Name{Local: "ID"}, Value: m.id(value)}, {Name: xml.Name{Local: "Name"}, Value: template.Name}, {Name: xml.Name{Local: "BaseLoc"}, Value: name}, {Name: xml.Name{Local: "ZOrder"}, Value: template.ZOrder}}, nil)
+			if err != nil {
+				return "", err
+			}
+			m.templateParts[value] = bytes.TrimPrefix(data, []byte(xml.Header))
+		}
+	}
+	return m.id(value), nil
+}
+
+// resolve 按所在XML解析包内路径，兼容阅读器接受的文档相对路径
+// 入参: name 所在XML, base 资源目录, value 路径值
+// 返回: string 包内路径, error 错误信息
+func (m *editorPageImport) resolve(name, base, value string) (string, error) {
+	for _, candidate := range []string{resolveResourcePath(name, base, value), m.reader.ResPath(value)} {
+		if m.reader.files[candidate] != nil {
+			return candidate, nil
+		}
+		if file, ok := m.reader.packageFile(candidate); ok {
+			return cleanPackagePath(file.Name), nil
+		}
+	}
+	return "", fmt.Errorf("import reference %q in %s not found", value, name)
+}
+
+// copyData 复制二进制资源或签名引用原文，返回绝对包路径
+// 入参: name 来源路径, evidence 是否原始签名凭据
+// 返回: string 新路径, error 错误信息
+func (m *editorPageImport) copyData(name string, evidence bool) (string, error) {
+	directory := m.prefix
+	if evidence {
+		directory = path.Join(directory, "Signed")
+	}
+	target := path.Join(directory, name)
+	if _, exists := m.files[target]; !exists {
+		data, err := m.reader.readFile(name)
+		if err != nil {
+			return "", err
+		}
+		m.files[target] = bytes.Clone(data)
+	}
+	return "/" + target, nil
+}
+
+// copyXML 复制页面或标准关联XML并重映射引用
+// 入参: name 来源路径
+// 返回: string 新路径, error 错误信息
+func (m *editorPageImport) copyXML(name string) (string, error) {
+	target := path.Join(m.prefix, name)
+	if _, exists := m.files[target]; exists {
+		return "/" + target, nil
+	}
+	data, err := m.reader.readFile(name)
+	if err != nil {
+		return "", err
+	}
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return "", err
+	}
+	m.files[target] = nil
+	if root.name.Local == "Page" {
+		for _, child := range root.children {
+			if child.name.Local == "PageRes" {
+				loc, err := m.resolve(name, "", editorImportText(data, child))
+				if err != nil {
+					return "", err
+				}
+				if err := m.resourceIndex(loc); err != nil {
+					return "", err
+				}
+			}
+		}
+	}
+	encoded, err := m.encode(editorImportEntry{name: name, data: data}, root)
+	if err != nil {
+		return "", err
+	}
+	m.files[target] = append([]byte(xml.Header), encoded...)
+	return "/" + target, nil
+}
+
+// editorImportText 获取节点直接文本，解码XML实体
+// 入参: data XML, node 节点
+// 返回: string 文本
+func editorImportText(data []byte, node *editorXML) string {
+	var value struct {
+		Text string `xml:",chardata"`
+	}
+	_ = xml.Unmarshal(data[node.start:node.end], &value)
+	return value.Text
+}
+
+// encode 编码标准OFD节点，保留文字数据和几何值，仅改写资源、标识及路径
+// 入参: entry 来源上下文, node 当前节点
+// 返回: []byte 独立XML片段, error 错误信息
+func (m *editorPageImport) encode(entry editorImportEntry, node *editorXML) ([]byte, error) {
+	if node.name.Space != "" && node.name.Space != ofdNamespace && node.name.Space != "http://www.ofdspec.org" {
+		return nil, fmt.Errorf("cannot remap extension namespace %q", node.name.Space)
+	}
+	name := node.name.Local
+	if name == "PageRes" {
+		return nil, nil
+	}
+	if name == "StampAnnot" && !m.pages[node.attr("PageRef")] {
+		return nil, nil
+	}
+	if name == "Action" {
+		if gotoNode := node.child("Goto"); gotoNode != nil {
+			var action Goto
+			if err := xml.Unmarshal(entry.data[gotoNode.start:gotoNode.end], &action); err != nil {
+				return nil, err
+			}
+			bookmarks := make(map[string]Dest)
+			for _, bookmark := range m.doc.Bookmarks.Bookmark {
+				bookmarks[bookmark.Name] = bookmark.Dest
+			}
+			if dest := gotoDest(&action, bookmarks); dest == nil || !m.pages[dest.PageID] {
+				return nil, nil
+			}
+		}
+	}
+	var attrs ofdAttrs
+	for _, attr := range node.attrs {
+		if attr.Name.Space == "xmlns" || attr.Name.Local == "xmlns" {
+			continue
+		}
+		if attr.Name.Space == "http://www.w3.org/2001/XMLSchema-instance" && (attr.Name.Local == "schemaLocation" || attr.Name.Local == "noNamespaceSchemaLocation") {
+			continue
+		}
+		if attr.Name.Space != "" {
+			return nil, fmt.Errorf("cannot remap extension attribute %q", attr.Name.Local)
+		}
+		key, value := attr.Name.Local, attr.Value
+		var err error
+		switch key {
+		case "ID":
+			if name == "Signature" || name == "StampAnnot" {
+				value = name + ":" + value
+			}
+			value = m.id(value)
+		case "Font", "ResourceID", "Substitution", "ImageMask", "Relative", "DrawParam", "ColorSpace", "Thumbnail", "TemplateID", "PageID", "PageRef", "RefId":
+			value, err = m.reference(value)
+		case "BaseLoc", "FileRef":
+			loc, resolveErr := m.resolve(entry.name, "", value)
+			if resolveErr != nil {
+				return nil, resolveErr
+			}
+			if key == "FileRef" {
+				value, err = m.copyData(loc, true)
+			} else {
+				value, err = m.copyXML(loc)
+			}
+		case "AttachID":
+			value, err = m.attachment(value)
+		}
+		if err != nil {
+			return nil, err
+		}
+		attrs = append(attrs, xml.Attr{Name: xml.Name{Local: key}, Value: value})
+	}
+	if m.defaultCS != "" && (name == "FillColor" || name == "StrokeColor" || name == "Color") && node.attr("ColorSpace") == "" {
+		attrs = append(attrs, xml.Attr{Name: xml.Name{Local: "ColorSpace"}, Value: m.defaultCS})
+	}
+	var content []byte
+	if name == "Page" {
+		area := m.doc.CommonData.PageArea
+		if local := node.child("Area"); local != nil {
+			var own PageArea
+			if err := xml.Unmarshal(entry.data[local.start:local.end], &own); err != nil {
+				return nil, err
+			}
+			if own.PhysicalBox != "" {
+				area.PhysicalBox = own.PhysicalBox
+			}
+			if own.ApplicationBox != "" {
+				area.ApplicationBox = own.ApplicationBox
+			}
+			if own.ContentBox != "" {
+				area.ContentBox = own.ContentBox
+			}
+			if own.BleedBox != "" {
+				area.BleedBox = own.BleedBox
+			}
+		}
+		var fields []byte
+		for _, field := range [][2]string{{"PhysicalBox", area.PhysicalBox}, {"ApplicationBox", area.ApplicationBox}, {"ContentBox", area.ContentBox}, {"BleedBox", area.BleedBox}} {
+			if field[1] != "" {
+				fields = append(fields, editorXMLText(field[0], field[1])...)
+			}
+		}
+		encoded, err := editorXMLContainer("Area", nil, fields)
+		if err != nil {
+			return nil, err
+		}
+		content = bytes.TrimPrefix(encoded, []byte(xml.Header))
+	}
+	for _, child := range node.children {
+		if name == "Page" && child.name.Local == "Area" {
+			continue
+		}
+		if name == "Goto" && child.name.Local == "Bookmark" {
+			for _, bookmark := range m.doc.Bookmarks.Bookmark {
+				if bookmark.Name != child.attr("Name") {
+					continue
+				}
+				dest := bookmark.Dest
+				encoded, err := xml.Marshal(struct {
+					XMLName xml.Name `xml:"Dest"`
+					Dest
+				}{Dest: dest})
+				if err != nil {
+					return nil, err
+				}
+				root, err := parseEditorXML(encoded)
+				if err != nil {
+					return nil, err
+				}
+				encoded, err = m.encode(editorImportEntry{data: encoded}, root)
+				if err != nil {
+					return nil, err
+				}
+				content = append(content, encoded...)
+			}
+			continue
+		}
+		encoded, err := m.encode(entry, child)
+		if err != nil {
+			return nil, err
+		}
+		content = append(content, encoded...)
+	}
+	if len(node.children) == 0 {
+		value := editorImportText(entry.data, node)
+		var err error
+		switch name {
+		case "FontFile", "MediaFile", "Profile", "SignedValue", "BaseLoc":
+			loc, resolveErr := m.resolve(entry.name, entry.base, strings.TrimSpace(value))
+			if resolveErr != nil {
+				return nil, resolveErr
+			}
+			value, err = m.copyData(loc, false)
+		case "FileLoc":
+			loc, resolveErr := m.resolve(entry.name, "", strings.TrimSpace(value))
+			if resolveErr != nil {
+				return nil, resolveErr
+			}
+			if node.parent.name.Local == "Attachment" {
+				value, err = m.copyData(loc, false)
+			} else {
+				value, err = m.copyXML(loc)
+			}
+		case "Font", "Substitution":
+			value, err = m.reference(strings.TrimSpace(value))
+		}
+		if err != nil {
+			return nil, err
+		}
+		var escaped bytes.Buffer
+		if err := xml.EscapeText(&escaped, []byte(value)); err != nil {
+			return nil, err
+		}
+		content = append(content, escaped.Bytes()...)
+	}
+	encoded, err := editorXMLContainer(name, attrs, content)
+	return bytes.TrimPrefix(encoded, []byte(xml.Header)), err
+}
+
+// annotations 复制所选页面的注释索引
+// 返回: []byte 索引条目, error 错误信息
+func (m *editorPageImport) annotations() ([]byte, error) {
+	if m.doc.Annotations == "" {
+		return nil, nil
+	}
+	name := m.reader.ResPath(m.doc.Annotations)
+	data, err := m.reader.readFile(name)
+	if err != nil {
+		return nil, err
+	}
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return nil, err
+	}
+	var entries []byte
+	for _, node := range root.children {
+		if !m.pages[node.attr("PageID")] {
+			continue
+		}
+		encoded, err := m.encode(editorImportEntry{name: name, data: data}, node)
+		if err != nil {
+			return nil, err
+		}
+		entries = append(entries, encoded...)
+	}
+	return entries, nil
+}
+
+// attachment 复制页面动作引用的附件，不导入无关附件
+// 入参: id 来源附件标识
+// 返回: string 新标识, error 错误信息
+func (m *editorPageImport) attachment(id string) (string, error) {
+	if _, exists := m.attachments[id]; exists {
+		return m.id(id), nil
+	}
+	name := m.reader.ResPath(m.reader.OFD.DocBody[0].DocRoot)
+	if m.doc.Attachments.Path != "" {
+		name = m.reader.ResPath(m.doc.Attachments.Path)
+	}
+	data, err := m.reader.readFile(name)
+	if err != nil {
+		return "", err
+	}
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return "", err
+	}
+	if m.doc.Attachments.Path == "" {
+		root = root.child("Attachments")
+	}
+	if root != nil {
+		for _, node := range root.children {
+			if node.name.Local == "Attachment" && node.attr("ID") == id {
+				m.attachments[id], err = m.encode(editorImportEntry{name: name, data: data}, node)
+				return m.id(id), err
+			}
+		}
+	}
+	return "", fmt.Errorf("attachment %q not found", id)
+}
+
+// signatures 复制所选页面的签章及原始验证凭据，过滤其他页面的签章位置
+// 返回: []byte 签名索引条目, error 错误信息
+func (m *editorPageImport) signatures() ([]byte, error) {
+	if m.doc.Signatures == "" {
+		return nil, nil
+	}
+	name := m.reader.ResPath(m.doc.Signatures)
+	data, err := m.reader.readFile(name)
+	if err != nil {
+		return nil, err
+	}
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return nil, err
+	}
+	var entries []byte
+	for _, node := range root.children {
+		if node.name.Local != "Signature" {
+			continue
+		}
+		loc, err := m.resolve(name, "", node.attr("BaseLoc"))
+		if err != nil {
+			return nil, err
+		}
+		value, err := m.reader.readFile(loc)
+		if err != nil {
+			return nil, err
+		}
+		var signature SignatureFile
+		if err := xml.Unmarshal(value, &signature); err != nil {
+			return nil, err
+		}
+		matched := false
+		for _, stamp := range signature.SignedInfo.StampAnnot {
+			matched = matched || m.pages[stamp.PageRef]
+		}
+		if !matched {
+			continue
+		}
+		encoded, err := m.encode(editorImportEntry{name: name, data: data}, node)
+		if err != nil {
+			return nil, err
+		}
+		entries = append(entries, encoded...)
+	}
+	return entries, nil
+}
+
+// merge 合并包索引及资源图，原有页面和元数据保持原文
+// 入参: base 目标基底, refs 插入页面, annotations 注释索引, signatures 签名索引
+// 返回: *editorSource 新基底, error 错误信息
+func (m *editorPageImport) merge(base *editorSource, refs []Page, annotations, signatures []byte) (*editorSource, error) {
+	files := maps.Clone(base.reader.files)
+	if files == nil {
+		files = make(map[string][]byte)
+	}
+	maps.Copy(files, m.files)
+	name := base.reader.ResPath(base.reader.OFD.DocBody[0].DocRoot)
+	data, err := base.reader.readFile(name)
+	if err != nil {
+		return nil, err
+	}
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return nil, err
+	}
+	common := root.child("CommonData")
+	if common == nil {
+		return nil, fmt.Errorf("document has no CommonData")
+	}
+	position := common.close
+	for _, node := range common.children {
+		if node.name.Local == "TemplatePage" || node.name.Local == "DefaultCS" {
+			position = node.start
+			break
+		}
+	}
+	content := editorXMLText("DocumentRes", "/"+path.Join(m.prefix, "Resources.xml"))
+	for _, id := range slices.Sorted(maps.Keys(m.templateParts)) {
+		content = append(content, m.templateParts[id]...)
+	}
+	data = editorPatchXML(data, []editorXMLPatch{{position, position, content}})
+	if len(annotations) != 0 {
+		loc, err := mergeImportIndex(base.reader, files, base.document.Annotations, path.Join(m.prefix, "Annotations.xml"), "Annotations", annotations)
+		if err != nil {
+			return nil, err
+		}
+		root, _ = parseEditorXML(data)
+		data = editorXMLSetText(data, root, [][2]string{{"Annotations", loc}})
+	}
+	if len(m.attachments) != 0 {
+		var entries []byte
+		for _, id := range slices.Sorted(maps.Keys(m.attachments)) {
+			entries = append(entries, m.attachments[id]...)
+		}
+		root, _ = parseEditorXML(data)
+		node := root.child("Attachments")
+		if node != nil && len(node.children) != 0 {
+			content := append(bytes.Clone(data[node.open:node.close]), entries...)
+			data = editorPatchXML(data, []editorXMLPatch{editorXMLContent(data, node, content)})
+		} else {
+			loc, err := mergeImportIndex(base.reader, files, base.document.Attachments.Path, path.Join(m.prefix, "Attachments.xml"), "Attachments", entries)
+			if err != nil {
+				return nil, err
+			}
+			data = editorXMLSetText(data, root, [][2]string{{"Attachments", loc}})
+		}
+	}
+	files[name] = data
+	if len(signatures) != 0 {
+		loc, err := mergeImportIndex(base.reader, files, base.document.Signatures, path.Join(m.prefix, "Signatures.xml"), "Signatures", signatures)
+		if err != nil {
+			return nil, err
+		}
+		if base.document.Signatures == "" {
+			ofd, err := base.reader.readFile("OFD.xml")
+			if err != nil {
+				return nil, err
+			}
+			root, err := parseEditorXML(ofd)
+			if err != nil {
+				return nil, err
+			}
+			files["OFD.xml"] = editorXMLSetText(ofd, root.child("DocBody"), [][2]string{{"Signatures", loc}})
+		}
+	}
+	reader := &Reader{Zip: base.reader.Zip, files: files}
+	if err := reader.initRoot(); err != nil {
+		return nil, err
+	}
+	doc, err := reader.Doc()
+	if err != nil {
+		return nil, err
+	}
+	next := *base
+	next.reader, next.document = reader, doc
+	next.pages, next.origins = maps.Clone(base.pages), maps.Clone(base.origins)
+	for id, page := range next.pages {
+		if page.original == nil {
+			next.pages[id] = &editorSourcePage{ref: page.ref}
+		}
+	}
+	for _, ref := range refs {
+		next.pages[ref.ID] = &editorSourcePage{ref: ref}
+	}
+	next.idsReady = true
+	return &next, nil
+}
+
+// mergeImportIndex 向原索引追加条目，不移动原条目的相对路径基准
+// 入参: reader 目标输入包, files 新条目, loc 原索引, fallback 新索引路径, rootName 根节点名称, entries 新条目
+// 返回: string 索引绝对路径, error 错误信息
+func mergeImportIndex(reader *Reader, files map[string][]byte, loc, fallback, rootName string, entries []byte) (string, error) {
+	name := fallback
+	var data []byte
+	var err error
+	if loc == "" {
+		data, err = editorXMLContainer(rootName, nil, entries)
+	} else {
+		name = reader.ResPath(loc)
+		data, err = reader.readFile(name)
+		if err != nil {
+			return "", err
+		}
+		root, parseErr := parseEditorXML(data)
+		if parseErr != nil {
+			return "", parseErr
+		}
+		if root.open == root.end {
+			data = editorPatchXML(data, []editorXMLPatch{editorXMLContent(data, root, entries)})
+		} else {
+			data = editorPatchXML(data, []editorXMLPatch{{root.close, root.close, entries}})
+		}
+	}
+	if err != nil {
+		return "", err
+	}
+	if rootName == "Signatures" {
+		root, err := parseEditorXML(data)
+		if err != nil {
+			return "", err
+		}
+		maximum := 0
+		for _, node := range root.children {
+			value := node.attr("ID")
+			if node.name.Local == "MaxSignId" {
+				value = editorImportText(data, node)
+			}
+			id, _ := strconv.Atoi(value)
+			maximum = max(maximum, id)
+		}
+		value := editorXMLText("MaxSignId", strconv.Itoa(maximum))
+		patch := editorXMLPatch{root.open, root.open, value}
+		if node := root.child("MaxSignId"); node != nil {
+			patch = editorXMLPatch{node.start, node.end, value}
+		}
+		data = editorPatchXML(data, []editorXMLPatch{patch})
+	}
+	files[name] = data
+	return "/" + name, nil
+}
diff --git a/ofdgo_editor_open.go b/ofdgo_editor_open.go
index 8bc268d..db2826e 100644
--- a/ofdgo_editor_open.go
+++ b/ofdgo_editor_open.go
@@ -45,7 +45,7 @@ type editorObjectOrigin struct {
 	page   *editorSourcePage
 	node   *editorXML
 	object GraphicObject
-	reason string
+	reason error
 }
 
 // editorSourcePage 保存页面原文、解析快照及图层和页块内的对象位置
@@ -72,16 +72,18 @@ type ObjectCapabilities struct {
 	Delete        bool
 	Order         bool
 	Reason        string
+	ReasonCode    EditReason
 	MissingGlyphs *MissingGlyphError
 }
 
 // editError 将操作受限原因转为错误，保留可供调用方识别的缺字诊断
 // 返回: error 受限原因
 func (c ObjectCapabilities) editError() error {
+	var err error = errors.New(c.Reason)
 	if c.MissingGlyphs != nil {
-		return c.MissingGlyphs
+		err = c.MissingGlyphs
 	}
-	return errors.New(c.Reason)
+	return &EditError{Code: c.ReasonCode, Err: err}
 }
 
 // PageCapabilities 页面可执行的操作，Insert表示可以添加RGB对象；新增空白页面始终可用
@@ -309,7 +311,7 @@ func (e *Editor) loadSourcePage(index int) error {
 				if editorXMLSupported(node) {
 					resolved, err := e.resolveEditorStyle(object, layer.DrawParam)
 					if err != nil {
-						origin.reason = err.Error()
+						origin.reason = err
 					} else {
 						layer.Objects[j] = resolved
 					}
@@ -343,10 +345,10 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 		return all, nil
 	}
 	if !editorXMLSupported(node) {
-		return ObjectCapabilities{Reason: "object uses unsupported editing features"}, nil
+		return ObjectCapabilities{Reason: "object uses unsupported editing features", ReasonCode: EditUnsupportedObject}, nil
 	}
-	if origin := e.objectOrigin(id); origin.reason != "" {
-		return ObjectCapabilities{Reason: origin.reason}, nil
+	if origin := e.objectOrigin(id); origin.reason != nil {
+		return ObjectCapabilities{Reason: origin.reason.Error(), ReasonCode: editReason(origin.reason)}, nil
 	}
 	for parent := node.parent; parent.name.Local != "Content"; parent = parent.parent {
 		allowed := "ID"
@@ -354,21 +356,23 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 			allowed += " Type DrawParam"
 		}
 		if !editorXMLAttributes(parent, allowed) {
-			return ObjectCapabilities{Reason: "object container uses unsupported editing features"}, nil
+			return ObjectCapabilities{Reason: "object container uses unsupported editing features", ReasonCode: EditUnsupportedContainer}, nil
 		}
 	}
 	if err := validateEditorGeometry(object); err != nil {
-		return ObjectCapabilities{Reason: err.Error()}, nil
+		return ObjectCapabilities{Reason: err.Error(), ReasonCode: EditInvalidObject}, nil
 	}
 	all.Order = editorContainerOrderable(node.parent)
 	if _, err := e.prepareObject(id, object); err != nil {
 		all.Update, all.Reflow, all.Copy, all.Reason = false, false, false, err.Error()
+		all.ReasonCode = editReason(err)
 		errors.As(err, &all.MissingGlyphs)
 	}
 	if !e.sourceRGB() {
 		all.ReplaceFont = false
 		all.Update, all.Reflow, all.Copy, all.Reason = false, false, false, "document uses a non-RGB default color space"
 		all.MissingGlyphs = nil
+		all.ReasonCode = EditUnsupportedColor
 	}
 	if object.Type == "TextObject" {
 		all.Arrange = all.Update
@@ -426,16 +430,16 @@ func (e *Editor) editorFont(id string) (*font.SFNT, error) {
 	if e.source != nil {
 		data, err := e.source.reader.FontData(id)
 		if err != nil {
-			return nil, err
+			return nil, &EditError{Code: EditFontUnavailable, Err: err}
 		}
 		sfnt, err := font.ParseSFNT(data, 0)
 		if err != nil {
-			return nil, err
+			return nil, &EditError{Code: EditFontUnavailable, Err: err}
 		}
 		e.fonts[id] = sfnt
 		return sfnt, nil
 	}
-	return nil, fmt.Errorf("embedded font %q not found", id)
+	return nil, &EditError{Code: EditFontUnavailable, Err: fmt.Errorf("embedded font %q not found", id)}
 }
 
 // editorImage 按需读取原图片尺寸，不解码完整像素
diff --git a/ofdgo_editor_style.go b/ofdgo_editor_style.go
index 15c18c5..254bd3a 100644
--- a/ofdgo_editor_style.go
+++ b/ofdgo_editor_style.go
@@ -25,7 +25,7 @@ func (e *Editor) editorDrawParam(id string, visited map[string]bool) (*DrawParam
 	}
 	dp := e.source.reader.drawParamCache[id]
 	if dp == nil || visited[id] {
-		return nil, fmt.Errorf("invalid draw parameter reference %q", id)
+		return nil, &EditError{Code: EditUnsupportedStyle, Err: fmt.Errorf("invalid draw parameter reference %q", id)}
 	}
 	visited[id] = true
 	base, err := e.editorDrawParam(dp.Relative, visited)
@@ -72,7 +72,7 @@ func (e *Editor) resolveEditorStyle(object GraphicObject, layer string) (Graphic
 	} else {
 		obj := &object.TextObject
 		if style.Cap != "" && style.Cap != "Butt" || style.DashPattern != "" || style.DashOffset != nil && *style.DashOffset != 0 {
-			return GraphicObject{}, fmt.Errorf("text draw parameters require unsupported stroke styles")
+			return GraphicObject{}, &EditError{Code: EditUnsupportedStyle, Err: fmt.Errorf("text draw parameters require unsupported stroke styles")}
 		}
 		style = mergeDrawParam(*style, &DrawParam{LineWidth: obj.LineWidth, Join: obj.Join,
 			MiterLimit: obj.MiterLimit, FillColor: obj.FillColor, StrokeColor: obj.StrokeColor})
@@ -84,7 +84,7 @@ func (e *Editor) resolveEditorStyle(object GraphicObject, layer string) (Graphic
 	}
 	for _, color := range []*FillColor{style.FillColor, (*FillColor)(style.StrokeColor)} {
 		if err := creationColor(color); err != nil {
-			return GraphicObject{}, fmt.Errorf("unsupported draw parameter color: %w", err)
+			return GraphicObject{}, &EditError{Code: EditUnsupportedColor, Err: fmt.Errorf("unsupported draw parameter color: %w", err)}
 		}
 	}
 	return cloneEditorObject(object)
diff --git a/ofdgo_editor_text.go b/ofdgo_editor_text.go
index 9803526..5f549d3 100644
--- a/ofdgo_editor_text.go
+++ b/ofdgo_editor_text.go
@@ -58,12 +58,69 @@ func missingGlyphError(id string, characters []rune) error {
 
 // TextLayout 本地横向段落选项，Wrap按CTM变换前的边界宽度折行，Align为left、center、right或justify
 // LineHeight为毫米单位的基线间距，0使用字体度量；LetterSpacing为字素间的附加毫米间距，可为负
+// LeftIndent和RightIndent为左右缩进，FirstLineIndent为每段首行相对左缩进的偏移，单位为毫米
 // 零值保持显式换行和左对齐
 type TextLayout struct {
-	Wrap          bool
-	Align         string
-	LineHeight    float64
-	LetterSpacing float64
+	Wrap            bool
+	Align           string
+	LineHeight      float64
+	LetterSpacing   float64
+	LeftIndent      float64
+	RightIndent     float64
+	FirstLineIndent float64
+}
+
+// TextStyle 文字样式增量，Font和Color为空、Size为0时保留原值
+// Size单位为毫米，Color为OFD的RGB分量字符串，保留原颜色透明度
+type TextStyle struct {
+	Font  string
+	Size  float64
+	Color string
+}
+
+// StyleText 原子更新同页文字样式，全部校验通过后提交一次撤销记录
+// 已知段落重新排版；原布局未知时替换字体和颜色保留坐标，不允许自动调整字号
+// 入参: page 页面索引, ids 文字对象标识, style 样式增量
+// 返回: error 错误信息
+func (e *Editor) StyleText(page int, ids []string, style TextStyle) error {
+	objects, _, err := e.selectedObjects(page, ids)
+	if err != nil {
+		return err
+	}
+	updates := make([]GraphicObject, len(objects))
+	for i, object := range objects {
+		id := editorObjectID(object)
+		if object.Type != "TextObject" {
+			return fmt.Errorf("object %q is not text", id)
+		}
+		updates[i] = cloneEditorData(object)
+		text := &updates[i].TextObject
+		value, layout := text.TextLayout()
+		known := e.objectOrigin(id) == nil || text.layout != nil
+		fontChanged := style.Font != "" && style.Font != text.Font
+		sizeChanged := style.Size != 0 && style.Size != text.Size
+		if sizeChanged && !known {
+			return &EditError{Code: EditUnsupportedObject, Err: fmt.Errorf("object %q requires explicit paragraph layout before changing size", id)}
+		}
+		if fontChanged {
+			text.Font = style.Font
+		}
+		if sizeChanged {
+			text.Size = style.Size
+		}
+		if known && (fontChanged || sizeChanged) {
+			if err := e.LayoutText(text, value, layout); err != nil {
+				return err
+			}
+		}
+		if style.Color != "" {
+			if text.FillColor == nil {
+				text.FillColor = &FillColor{}
+			}
+			text.FillColor.Value = style.Color
+		}
+	}
+	return e.UpdateObjects(page, updates)
 }
 
 // textLayout 保存编辑中的原文与选项，不写入OFD，也不参与渲染
@@ -83,9 +140,9 @@ func (obj TextObject) TextLayout() (string, TextLayout) {
 }
 
 // breakTextLines 优先使用Unicode断行机会，过长词仅在字素边界折行，不丢弃空白
-// 入参: runes 段落字符, advances 含字距的字符步进, width 本地排版宽度, wrap 是否自动折行, spacing 附加字距
+// 入参: runes 段落字符, advances 含字距的字符步进, width 本地排版宽度, wrap 是否自动折行, spacing 附加字距, indent 首行缩进
 // 返回: [][2]int 各行的字符起止索引，左闭右开
-func breakTextLines(runes []rune, advances []float64, width float64, wrap bool, spacing float64) [][2]int {
+func breakTextLines(runes []rune, advances []float64, width float64, wrap bool, spacing, indent float64) [][2]int {
 	if !wrap || len(runes) == 0 {
 		return [][2]int{{0, len(runes)}}
 	}
@@ -107,6 +164,10 @@ func breakTextLines(runes []rune, advances []float64, width float64, wrap bool,
 	}
 	var lines [][2]int
 	for start, cursor := 0, 0; start < len(runes); {
+		available := width
+		if start == 0 {
+			available -= indent
+		}
 		end, legal, next := start, start, cursor
 		for next < len(ends) {
 			candidate := ends[next]
@@ -118,7 +179,7 @@ func breakTextLines(runes []rune, advances []float64, width float64, wrap bool,
 			if visible > start {
 				length -= spacing
 			}
-			if length > width && end > start {
+			if length > available && end > start {
 				break
 			}
 			end = candidate
@@ -126,7 +187,7 @@ func breakTextLines(runes []rune, advances []float64, width float64, wrap bool,
 			if breaks[end] {
 				legal = end
 			}
-			if length > width {
+			if length > available {
 				break
 			}
 		}
diff --git a/ofdgo_font_file.go b/ofdgo_font_file.go
index a6339a8..4dd69e1 100644
--- a/ofdgo_font_file.go
+++ b/ofdgo_font_file.go
@@ -19,6 +19,7 @@ import (
 	"encoding/binary"
 	"fmt"
 	"strings"
+	"unicode/utf8"
 
 	"github.com/tdewolff/font"
 )
@@ -96,6 +97,35 @@ func (f FontFile) Face(index int) ([]byte, error) {
 	return bytes.Clone(data), nil
 }
 
+// MissingGlyphs 检查指定字体的字符覆盖，不注册资源或修改文档，忽略段落换行
+// 入参: index 零起始字体索引, text 待检查文字
+// 返回: string 按首次出现顺序去重的缺失字符, error 字体或文字格式错误
+func (f FontFile) MissingGlyphs(index int, text string) (string, error) {
+	if !utf8.ValidString(text) {
+		return "", fmt.Errorf("text must be UTF-8")
+	}
+	data, err := f.Face(index)
+	if err != nil {
+		return "", err
+	}
+	sfnt, err := font.ParseSFNT(data, 0)
+	if err != nil {
+		return "", err
+	}
+	seen := make(map[rune]bool)
+	var missing strings.Builder
+	for _, char := range text {
+		if char == '\r' || char == '\n' || seen[char] {
+			continue
+		}
+		seen[char] = true
+		if sfnt.GlyphIndex(char) == 0 {
+			missing.WriteRune(char)
+		}
+	}
+	return missing.String(), nil
+}
+
 // fontFileCount 校验字体或集合头并读取字体数量
 // 入参: data OpenType数据
 // 返回: int 字体数量, error 格式错误