✏️ PDF 编辑文字（直接修改原文）Edit PDF Text in Place

使用说明与常见问题How-to & FAQ

「PDF 编辑文字（直接修改原文）」是什么？What is the Edit PDF Text in Place tool?

像编辑文档一样直接修改 PDF 里原有的文字：点击文字即可插入、删除、替换，多行段落自动重新换行，新文字沿用原来的字体、字号、颜色和位置；子集字体缺字可自动用 PDF 中其他字体补齐或上传 TTF/OTF 字体，其余内容保持不变。Edit the text that is already in a PDF like a document: click any text to insert, delete or replace characters, multi-line paragraphs re-flow, and the result keeps the original font, size, colour and position. Characters a subset font lacks are filled from other PDF fonts or a TTF/OTF you upload; everything else stays untouched.

如何使用「PDF 编辑文字（直接修改原文）」？How do I use the Edit PDF Text in Place?

打开 PDF 后，页面上的文字会被识别成可编辑的段落；点击任意文字，原位出现编辑框，直接插入、删除或修改文字，按 Ctrl+Enter 或点「完成」后预览立即更新（预览就是最终效果）。可以删除整段，也可以切换到「添加文字」在空白处写字。完成后点「生成并下载 PDF」。Open a PDF and its text is recognised as editable blocks. Click any text and an editor appears in place — insert, delete or change characters, then press Ctrl+Enter or “Done” and the preview (which is the final result) updates. You can delete a whole block or switch to “Add text” to write on empty space. Click “Generate & download PDF” when finished.

它是真的修改原文字，而不是盖一层白块吗？Does it really change the original text, or just cover it with a white box?

是真的修改。工具会解析页面的内容流，找到这段文字对应的绘制指令（Tj / TJ），把原来的字删除，再用同一个字体资源在原位置写入新文字；不会加白色遮挡块，复制、搜索得到的也是新文字。没有修改的文字和图形保持原样（检测时对未修改区域逐像素比对一致）。It really changes it. The tool parses the page content stream, finds the drawing operators (Tj / TJ) of that text, removes the old characters and writes the new ones in place with the same font resource — no white cover-up boxes, and copying or searching finds the new text. Everything you did not edit stays as it was (unedited areas are pixel-identical in our tests).

为什么有的字写不出来？可以上传字体吗？Why can’t some characters be written? Can I upload a font?

PDF 通常只嵌入用到的字形（子集字体），原文里没出现过的字，原字体里就没有。缺字时会依次尝试：PDF 里其他含有这个字的字体 → 你上传的 TTF/OTF 字体 → 备用字体（西文 Helvetica、中文思源黑体）。上传的字体只会嵌入用到的字形。编辑框下方会实时提示哪些字需要补字。PDFs usually embed only the glyphs they use (subset fonts), so characters that never appear in the original are not in its font. Missing characters are taken, in order, from another font in the PDF that has them, then from a TTF/OTF you upload, then from the fallback (Helvetica for Latin, Noto Sans SC for Chinese). Only the glyphs used are embedded. The editor tells you live which characters need a substitute.

多行段落怎么处理？会改变排版吗？How are multi-line paragraphs handled?

识别出的多行段落会在原来的宽度内重新换行，行距沿用原来的行距，左对齐、居中、右对齐和两端对齐都会保持；没改到的行保持原样不重写。文字变多时默认略微缩小字号保持原行数（可关闭）；单行文字超出原宽度时可以选择自动缩小。A recognised multi-line paragraph re-flows within its original width at the original line spacing, keeping left, centred, right or justified alignment; lines you did not touch are left as they were. When the text grows, the font is reduced slightly by default to keep the line count (can be turned off); single lines that overflow can optionally shrink to fit.

有哪些限制？What are the limitations?

扫描件或图片 PDF 没有文字层，需要先 OCR；Type3 字体只能复用原有字形，新字会用其他字体补齐；竖排文字和特殊多字节编码的字体只能删除不能编辑；表单对象（如页眉）被多页共用时，修改会同时出现在这些页；旋转、裁剪区域内的文字可以编辑，但加长后可能被裁掉；加密 PDF 需要先输入密码，导出后不再加密；已签名的 PDF 修改后签名会失效。Scanned or image-only PDFs have no text layer and need OCR first; Type3 fonts can only reuse their existing glyphs, new characters come from another font; vertical text and fonts with special multi-byte encodings can be deleted but not edited; a form object shared by several pages (e.g. a header) changes on all of them; rotated or clipped text can be edited, but longer text may be clipped; encrypted PDFs need their password and are exported unencrypted; editing a signed PDF invalidates the signature.

「PDF 编辑文字（直接修改原文）」免费吗？数据会上传吗？Is the Edit PDF Text in Place free? Is my data uploaded?

「PDF 编辑文字（直接修改原文）」完全免费，无需注册或安装，手机和电脑都能用；所有处理都在你的浏览器本地完成，输入的内容和文件不会上传到服务器。The Edit PDF Text in Place is completely free with no sign-up or install and works on phones and desktops; everything runs locally in your browser and nothing you enter is uploaded.