⬛ PDF 涂黑（敏感信息遮盖）Redact PDF

使用说明与常见问题How-to & FAQ

「PDF 涂黑（敏感信息遮盖）」是什么？What is the Redact PDF tool?

永久遮盖 PDF 里的敏感信息：在页面上拖动画出黑框，或输入关键词、勾选邮箱/手机号/身份证号/银行卡号自动查找并加框；导出时把有遮盖的页面重新渲染为图片，框下的文字、图片和隐藏图层都会从文件中删除，无法复制或恢复。文件不上传。Permanently black out sensitive information in a PDF. Drag boxes on the page, or search for words and common patterns (emails, phone numbers, Chinese ID numbers, card numbers) to add boxes automatically. On export the redacted pages are re-rendered as images, so the text, images and hidden layers under the boxes are removed from the file and can't be copied or recovered. Nothing is uploaded.

如何使用「PDF 涂黑（敏感信息遮盖）」？How do I use the Redact PDF tool?

选择或拖入 PDF（加密的先输入密码并点「打开」），在页面上拖动画出遮盖框，或填写要查找的文字、勾选邮箱、电话、身份证号、银行卡号等后点「查找并添加遮盖框」；设置填充颜色和清晰度等，然后点「遮盖并下载」。被遮盖的页面会转成图片，框下的内容无法再复制或恢复。Choose or drop a PDF (for an encrypted one, enter the password and click Open first). Drag boxes on the page, or type text to find and tick emails, phone numbers, ID numbers or card numbers, then click "Find & add boxes". Set the fill, resolution and other options and click "Redact & download". Redacted pages are turned into images, so the content under the boxes can't be copied or recovered.

遮盖后的内容真的删除了吗？Is the covered content really removed?

是的。很多“涂黑”只是在原文上盖一个黑色方块，文字仍然可以复制、搜索或被移开。本工具导出时会把带遮盖框的页面在本地重新渲染成图片，再用图片替换整页内容，所以框下的文字、图片、隐藏图层和批注都不再存在于这些页面中。没有遮盖框的页面保持原样，仍可选择文字；如需全部去除文字层，请把“转为图片的页面”设为“所有页面”。Yes. Many redactions just place a black square over the original, and the text can still be copied, searched or moved aside. This tool re-renders every page that has a box as an image on your device and replaces the whole page with it, so the text, images, hidden layers and annotations under the boxes no longer exist on those pages. Pages without boxes are copied unchanged and keep selectable text; set Flatten to images to All pages to remove every text layer.

自动查找能识别哪些内容？What can Find detect?

可以查找你输入的任意文字（每行一项，可忽略大小写，空格位置不限），也可以用正则表达式。常用项包括：邮箱地址；中国大陆手机号、带区号的固定电话和北美格式电话；18 位身份证号（校验出生日期格式）；13–19 位银行卡/信用卡号（通过 Luhn 校验，减少误报）。查找依赖 PDF 自带的文字层，扫描件请手动画框。Any text you enter (one item per line, optionally ignoring case and spacing) or a regular expression. The common patterns are email addresses; mainland China mobile numbers, landlines with area codes and North American phone numbers; 18-digit Chinese ID numbers (with a valid birth-date part); and 13–19-digit card numbers that pass the Luhn check, which cuts false matches. Find uses the PDF's text layer, so draw boxes by hand on scanned pages.

为什么导出后文件变大、文字不能选了？Why is the file bigger, and why can't I select text?

带遮盖框的页面被转成了图片，图片通常比文字占空间，也不能再选择或搜索文字，这正是彻底删除的代价。150 DPI 适合屏幕阅读，打印或有小字时选 200–300 DPI；PNG 无损但更大。需要可搜索的文字，可以之后用 OCR 软件处理。Pages with boxes become images, which usually take more space than text and can't be selected or searched — that's the cost of truly removing the content. 150 DPI suits on-screen reading; choose 200–300 DPI for printing or small print. PNG is lossless but larger. Run the result through OCR software if you need searchable text again.

还会留下哪些信息？What else could leak?

默认会删除文档信息（标题、作者、创建软件等），书签、附件、表单和脚本也不会复制到新文件。请注意文件名本身、没有加框页面上的内容，以及图片里能看出的信息（例如照片中的车牌），都需要自己检查。导出后建议用阅读器搜索一次关键词确认。Document info (title, author, creating software and so on) is removed by default, and bookmarks, attachments, forms and scripts aren't copied to the new file. Check the file name itself, the content of pages without boxes and anything visible inside pictures (such as number plates) yourself. After exporting, search for the key words in a viewer to confirm.

文件会上传到服务器吗？Are my files uploaded?

不会。PDF 在你的浏览器里用 pdf-lib / pdf.js 处理，文件不会离开你的设备，关闭页面后不留存任何数据。No. The PDF is processed in your browser with pdf-lib / pdf.js; files never leave your device and nothing is kept after you close the page.

「PDF 涂黑（敏感信息遮盖）」免费吗？需要注册吗？Is the Redact PDF free? Do I need an account?

「PDF 涂黑（敏感信息遮盖）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Redact PDF is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.