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加密PDF

为PDF文件添加密码保护。添加加密并设置权限。

上傳PDF檔案

拖放PDF檔案到此處，或點選瀏覽。

關於此工具

加密PDF为您的PDF文档添加密码保护和加密。设置用户密码以防止打开，设置所有者密码以控制打印和复制等权限。

根据不同的安全需求选择不同的加密级别（128位或256位AES）。

所有加密都在您的浏览器中进行，确保您的密码和文档保持私密。

使用方法

  1. 上传PDF文件

    拖放您的PDF文件或点击选择。

  2. 设置密码

    输入用户密码和/或所有者密码。配置权限。

  3. 加密并下载

    点击加密保护您的PDF并下载。

使用場景

机密文档

保护敏感的商业文档。

个人文件

保护个人文档如税务申报表。

受控分发

限制收件人对文档的操作。

Practical guide

Why choose local processing?

  • Sensitive PDFs can contain contracts, invoices, identity details, or internal business information, so keeping processing in the browser reduces exposure.
  • The website tool is free to use with no usage limits and does not require sign-in.
  • Local processing also keeps iteration fast: adjust options, preview the result, and export an encrypted PDF without waiting for an upload queue.

Best files for this tool

  • Best for PDF files that open correctly in a modern browser and are not intentionally damaged or restricted.
  • Works well for everyday business, school, legal, finance, and personal documents where you need an encrypted PDF.
  • For very large files, close unused tabs and process one batch at a time so the browser has enough memory.

Common limitations

  • Encrypted or permission-restricted PDFs may need to be unlocked before processing.
  • Scanned pages, unusual fonts, complex layers, and damaged files can reduce accuracy or processing speed.
  • Browser memory and device performance matter more for local tools than for upload-based services.

Local processing vs upload-based tools

  • Local tools keep routine website processing on your device, while upload-based tools send files to a remote server.
  • Upload-based services can move heavy work off your computer, but they add transfer time and require trusting a server with your files.
  • Use the API when you intentionally need server-side automation; use the website when you want private manual processing.

What to do if processing fails

  • Try a smaller file, a shorter page range, or one file at a time if the browser runs out of memory.
  • If a PDF is encrypted, damaged, or restricted, unlock or repair it first and then retry the workflow.
  • If the output looks wrong, check whether the source file uses scans, complex transparency, form fields, or unsupported embedded objects.

API automation

Use API docs to plan automated PDF workflows. If this exact website workflow is not exposed as an endpoint yet, you can still use available PDF API tools and Credits for supported operations.

View API automation docsCreate API Key

常見問題

用户密码和所有者密码有什么区别？

用户密码防止打开；所有者密码控制权限。

使用什么加密？

提供128位或256位AES加密选项。

可以只设置权限而不设置用户密码吗？

是的，您可以只设置所有者密码来控制权限。

相關工具

解密PDFPDF安全
更改权限PDF安全
清理PDFPDF安全