Protect PDF
Add password protection to your PDF files. Secure documents with 256-bit encryption.
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Secure your PDF files with password protection using 256-bit AES encryption. Recipients will need to enter the password to open the document.
Protect PDF — 使用方法
- 1 Upload your PDF file
- 2 Enter a strong password (min. 4 characters)
- 3 Click Protect to encrypt
- 4 Download the password-protected PDF
常見問題
We use 256-bit AES encryption, the same standard used by banks and government agencies.
Yes, use our Unlock PDF tool with the password to remove protection.