保护PDF
为PDF文件添加密码保护。使用加密保护您的文档。
使用方法
- 1
Upload PDF
Upload the PDF file you want to protect.
- 2
Set password
Enter a strong password to protect your PDF.
- 3
Configure permissions
Choose what actions are allowed (print, copy, edit).
- 4
Download protected PDF
Download your password-protected PDF file.
核心功能
- 支持 PDF、DOCX、XLSX、PPTX 等格式
- 处理前实时预览
- 批量处理多个文件
- 保留原始格式
- 文件加密并自动删除
- 闪电般的处理引擎
为什么选择我们的工具
✓免费，无需注册
✓安全的文件处理
✓支持所有设备
✓无需安装软件
✓快速处理
✓高质量输出
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Protect PDF with Password
Add password protection and set permissions to secure your PDF documents
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Drop your PDF here
或点击浏览
Maximum file size: 100 MB
Your file will be encrypted and secured
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Strong Encryption
256-bit AES encryption protects your PDFs
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Custom Permissions
Control printing, copying, editing, and annotations
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密码保护
Secure documents with strong password authentication
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Fast Processing
Instant protection without quality loss