加密PDF
为PDF文件添加密码保护，AES-256加密
设置密码后，打开PDF需要输入此密码
拖拽文件到这里
或点击选择文件
最大 30MB · 文件不上传到服务器
为PDF文件添加AES-256密码加密保护敏感文档。只有知道密码的人才能查看。适合机密报告和法律文件。
如何使用
1
Upload PDF
Select the PDF file you want to protect.
2
Set Password
Enter and confirm a strong password (min 4 characters).
3
Download Protected
Your PDF is now encrypted and password-protected.
常见问题
Is the encryption secure?
Yes, we use AES-256 encryption - the same standard used by governments and banks.
Can I remove the password later?
Yes, use our Unlock PDF tool with the correct password to remove protection.
Can I still edit a protected PDF?
The protected PDF allows viewing, printing, and copying. Unlock it for full editing.