加密PDF
为PDF文件添加密码保护。添加加密并设置权限。
上传PDF文件
关于此工具
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。
Practical guidance before you use 加密PDF
Best for real document workflows
Best for adding password protection before sending private forms, draft agreements, statements, or internal files. 机密文档 is a common example: 保护敏感的商业文档。
Privacy and file handling
EasyPDFNex prioritizes local processing in your browser. That means supported PDF operations run on your device, not in a public cloud queue. For sensitive files, review the output before sharing it, close the browser tab after downloading, and avoid processing documents you are not authorized to edit.
Quality checks after processing
After you 加密并下载, open the result and check page order, text readability, signatures, links, and form fields. If the source file is scanned, encrypted, very large, or damaged, try a related workflow such as decrypt pdf, change permissions, sanitize pdf before repeating the task.
Choose a strong password and decide how the recipient will receive it separately from the PDF. For 加密PDF, the first step is usually "上传PDF文件": 拖放您的PDF文件或点击选择。 Test the protected file in a separate viewer before sharing so you know the password and permissions behave as expected.
Editorial review note
This guidance is maintained by the EasyPDFNex editorial team and reviewed for practical PDF workflow accuracy. Tool pages are written to explain when a feature is useful, what to check before download, and where browser-based processing has limits.
如何使用
上传PDF文件
拖放您的PDF文件或点击选择。
设置密码
输入用户密码和/或所有者密码。配置权限。
加密并下载
点击加密保护您的PDF并下载。
使用场景
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。
常见问题
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。