diff --git a/assets/webui/index.html b/assets/webui/index.html
index b584b4b..088282d 100644
--- a/assets/webui/index.html
+++ b/assets/webui/index.html
@@ -57,7 +57,7 @@
 					<option value="300" selected>300 dpi</option>
 					<option value="600">600 dpi</option>
 				</select><span id="dpiValue" aria-hidden="true">300</span></label>
-				<label class="toolbar-select"><select id="outputCompression" class="format-select" title="压缩" aria-label="压缩" disabled><option value="0">不变</option><option value="1">无损</option><option value="2">有损</option></select><span id="compressionValue" data-short="原" aria-hidden="true">不变</span></label>
+				<label class="toolbar-select"><select id="outputCompression" class="format-select" title="压缩" aria-label="压缩" disabled><option value="0">默认</option><option value="1">无损</option><option value="2">有损</option></select><span id="compressionValue" data-short="默" aria-hidden="true">默认</span></label>
 				<button id="exportPageButton" class="button" type="button" data-short="单" title="导出单页" aria-label="导出单页" disabled>单页</button>
 				<button id="exportButton" class="button" type="button" data-short="多" title="导出文档" aria-label="导出文档" aria-haspopup="dialog" aria-controls="exportPanel" disabled>文档</button>
 			</div>
@@ -184,7 +184,7 @@
 					<button id="convertAdd" class="button" type="button">添加</button><button id="convertClear" class="button" type="button">清空</button>
 					<div class="convert-options">
 						<div class="form-row"><label for="convertFormat">格式</label><select id="convertFormat" required></select></div>
-						<div class="form-row"><label for="convertCompression">压缩</label><select id="convertCompression"><option value="0">不变</option><option value="1">无损</option><option value="2">有损</option></select></div>
+						<div class="form-row"><label for="convertCompression">压缩</label><select id="convertCompression"><option value="0">默认</option><option value="1">无损</option><option value="2">有损</option></select></div>
 						<div id="convertDPIRow" class="form-row" hidden><label for="convertDPI">精度</label><select id="convertDPI"><option value="96">96 dpi</option><option value="150">150 dpi</option><option value="300" selected>300 dpi</option><option value="600">600 dpi</option></select></div>
 						<div class="form-row"><label for="convertDestination">保存</label><select id="convertDestination"><option value="directory">目录</option><option value="archive">打包</option></select></div>
 					</div>
diff --git a/assets/webui/ofdgo.js b/assets/webui/ofdgo.js
index d533580..035db85 100644
--- a/assets/webui/ofdgo.js
+++ b/assets/webui/ofdgo.js
@@ -1254,7 +1254,7 @@ document.addEventListener("selectionchange", syncSelection);
 el.exportFormat.addEventListener("change", () => updateDPIControl());
 el.outputCompression.addEventListener("change", () => {
 	el.compressionValue.textContent = el.outputCompression.selectedOptions[0].textContent;
-	el.compressionValue.dataset.short = ["原", "无", "有"][Number(el.outputCompression.value)];
+	el.compressionValue.dataset.short = ["默", "无", "有"][Number(el.outputCompression.value)];
 });
 el.exportPageButton.addEventListener("click", () => exportFile(false));
 el.exportButton.addEventListener("click", () => openExportPanel());
diff --git a/go.mod b/go.mod
index a930d86..11e1ea1 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/tdewolff/canvas v0.0.0-20260923214215-09804640d00c
 	github.com/tdewolff/font v0.0.0-20260913163313-54f98bb59ee6
 	github.com/xiaoqidun/jbig2 v1.1.1
-	github.com/xiaoqidun/pdfgo v0.0.0-20260929114121-a594c1621114
+	github.com/xiaoqidun/pdfgo v0.0.0-20260929115319-4a25c95d8fef
 	golang.org/x/crypto v0.57.0
 	golang.org/x/image v0.46.0
 	golang.org/x/text v0.42.0
diff --git a/go.sum b/go.sum
index f2d6f22..6314662 100644
--- a/go.sum
+++ b/go.sum
@@ -62,8 +62,8 @@ github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 github.com/xiaoqidun/jbig2 v1.1.1 h1:SjliS9ZO0e9HX5oYUfBuXrfFsXhWricrSz+XY4zORDI=
 github.com/xiaoqidun/jbig2 v1.1.1/go.mod h1:8QonVWtENmh2kc6l+leqeGl7psb79DWlHDkCpdChjfQ=
-github.com/xiaoqidun/pdfgo v0.0.0-20260929114121-a594c1621114 h1:K2U1YTqej82Zh81lS+VqQzfggroGBBfcTsGQh9fD64E=
-github.com/xiaoqidun/pdfgo v0.0.0-20260929114121-a594c1621114/go.mod h1:4Pf0JO0BEf1uzRY+uZjlMjN/OPn3PYa0YMi6cqPPTLQ=
+github.com/xiaoqidun/pdfgo v0.0.0-20260929115319-4a25c95d8fef h1:AYQXIlR7DHcRaP6+ssVSRYMjmb5FhQkQZiex5P+P1so=
+github.com/xiaoqidun/pdfgo v0.0.0-20260929115319-4a25c95d8fef/go.mod h1:4Pf0JO0BEf1uzRY+uZjlMjN/OPn3PYa0YMi6cqPPTLQ=
 github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
 github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
 github.com/yuin/goldmark v1.8.5 h1:r6N5afV5qj/5S4UTch8agZHJ8UxNCMwX7WjkkJam2NA=
diff --git a/ofdgo_compression.go b/ofdgo_compression.go
index d2f7228..16f9192 100644
--- a/ofdgo_compression.go
+++ b/ofdgo_compression.go
@@ -36,10 +36,11 @@ const (
 	CompressionLossy     = pdfgo.CompressionLossy
 )
 
-// CompressionMode 选择不变、无损或有损输出，不改变导出分辨率
+// CompressionMode 选择默认、无损或有损输出，不改变导出分辨率
 type CompressionMode = pdfgo.CompressionMode
 
-// CompressionOptions 配置输出压缩，零值保留现有行为，Quality为有损质量1至100，0使用85
+// CompressionOptions 配置输出压缩，默认模式沿用现有输出策略，不额外优化
+// Mode零值CompressionUnchanged表示默认模式，Quality为有损质量1至100，0使用85
 // 无损表示不引入额外损失，不保证跨格式转换可逆；有损仅降低图片画质，不栅格化文字和矢量
 type CompressionOptions = pdfgo.CompressionOptions
 
diff --git a/ofdgo_convert.go b/ofdgo_convert.go
index 367cfc4..8f89254 100644
--- a/ofdgo_convert.go
+++ b/ofdgo_convert.go
@@ -104,7 +104,7 @@ func OutputFormats() []OutputFormat {
 }
 
 // Convert 将PDF或OFD转换为指定格式，不关闭调用方的输入和输出
-// 不变模式完整OFD另存保持源字节；选页和跨格式输出重新生成文档，压缩仅作用于输出副本
+// 默认模式完整OFD另存保持源字节；选页和跨格式输出重新生成文档，压缩仅作用于输出副本
 // 输入按需随机读取，输出分块写出；解析对象及后端可能缓存资源，不保证恒定内存
 // 出错时报告保留已有诊断，调用方应丢弃未完成输出；只有返回nil才表示转换成功
 // 入参: ctx 取消上下文, source 源数据, size 源字节数, output 输出流, options 转换选项