Redact PDF
Draw over sensitive content to permanently black it out.
Permanent & irreversible redaction
Black out any text or area
Protect sensitive information
Compliance-ready output
PDF
PDF 涂黑（打码）一览
打码前需要了解的要点。
- 价格
- 免费，无水印。 无需注册。免费账户可一次处理 3 个 PDF。
- 支持格式
- 任意 PDF 文件。 可从设备、Google Drive、Dropbox 或 OneDrive 添加。加密文件可当场解锁。
- 输出
- 内容被真正删除的 PDF。 色块下的文字、图片和图形会被彻底删除，而不只是遮住；文档属性信息也会清空。
- 限制
- 未登录：1 个 PDF，最大 80 MB。 免费账户：一次 3 个 PDF，单个 80 MB，总计 120 MB。
- 适用于
- 任意浏览器，免安装。 iPhone、安卓手机、Windows、Mac、Linux 和 Chromebook。
- 隐私
- 安全处理，随后删除。 HTTPS 加密传输，文件在一小时内自动删除。
How to redact a PDF
1
Upload your PDF from your device, or pull it directly from Google Drive, Dropbox, or OneDrive. Without an account you can redact one file up to 80 MB. With a free account you can redact up to 3 files at once - 80 MB each, 120 MB in total.
2
Click and drag anywhere on a page to draw a black box over what you want to redact - text, an image, a signature, or a whole section. Drag a box to reposition it, pull its handles to resize, or click the × to delete - and undo any change while you work.
3
Add as many redactions as you need, on any page. The black boxes are a preview - the underlying content is still in the file at this stage.
4
Click Redact PDF to apply. The content under every box is permanently stripped from the document - not just covered. Even copy-paste and text search will turn up nothing.
5
Download your redacted PDF (or a ZIP when you redact several), save it back to the cloud, or send it straight into another tool like Merge or Sign.
Why use our Redact PDF tool
True permanent redaction
We do not just paint over the content - we delete it from the PDF entirely. There is nothing left under the box to recover.
Not the same as highlighting
Many tools draw a black rectangle on top of the text, but the text stays in the file. Ours strips the text out cleanly so it cannot be revealed.
Click and drag to mark
Pull a box around any region of a page, then drag it to reposition, grab a handle to resize, or undo any change. The preview shows exactly which area will be wiped when you save.
Redact several files at once
With a free account, load up to 3 PDFs, give each its own boxes, and redact them together - they come back in a single ZIP download.
Removes form fields and annotations
Any form field, comment, or annotation overlapping a box is deleted before the content is stripped, so nothing stored underneath survives.
Works on text, images, and areas
Redact a sentence, a signature, a stamp, a barcode, or a whole figure. Anything inside the box is gone after saving.
Removes searchable text too
Hidden text layers are removed alongside the visible content, so search engines, screen readers, and copy-paste find nothing.
Rest of the PDF stays intact
Everything outside your boxes is preserved at full quality. Only the marked areas are touched.
Cloud import
Pull files from Google Drive, Dropbox, or OneDrive without a local download step.
Workflow Ready
Send a redacted PDF straight into Merge, Compress, Protect, or any other tool without re-uploading it.
Free, no watermark
No watermark on the PDF, no signup needed, no per-day cap on jobs.
Frequently asked questions
PDF 怎么免费打码、涂黑文字？
在上方添加 PDF，在要隐藏的文字或图片上拖出色块，然后应用即可下载内容已被彻底删除的 PDF。完全免费，无水印，无需注册。
PDF 打码后别人能清除吗？
不能。色块下的文字、图片和图形会从文件中删除，而不是被一个形状挡住，所以无法复制、搜索，也不能通过挪开色块看到原内容。色块下的表单域也会被移除，作者、标题等文档属性也会清空。
为什么只画一个黑色方块不安全？
普通画上去的方块只是视觉上遮住文字，下面的文字仍然可以选中、复制或被搜索到。真正的涂黑（本工具的做法）会把内容从文件中删除。
打码的色块可以选颜色吗？
可以，支持黑色、白色、灰色和红色。白色适合让被删除的区域与页面背景融为一体。
怎么在每一页的同一位置打码？
画一次色块并应用到全部页面，适合页眉、页脚或每页同一位置的账号、身份证号等。
色块可以移动、调整大小或撤销吗？
可以。拖动色块可移动，拉动边角可调整大小，点 × 删除，还能撤销。点击应用之前不会删除任何内容。
能按关键字批量打码吗？
目前不支持。色块需要手动绘制，请逐页检查需要隐藏的姓名、号码或文字。
手机上怎么给 PDF 打码？
在手机浏览器（Safari、Chrome 等）中打开本页，添加 PDF，用手指画出色块后下载即可，无需安装 App。
可以批量给多个 PDF 打码吗？
免费账户一次最多 3 个 PDF（单个 80 MB，总计 120 MB），每个文件有各自的色块，结果打包成一个 ZIP 下载。
文件安全吗？
安全。文件通过 HTTPS 加密传输，在我们的服务器上处理，一小时内自动删除，不会分享给任何人，也不会用于训练 AI。
