All toolsLocal · no upload
Encrypt PDF
Free · no watermark · files stay on your device
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About this tool
Password-protect a PDF so it cannot be opened without the password. Encryption runs locally — we never see the file or password.
How to use Encrypt PDF
- 1Open an unlocked PDF.
- 2Set a password you will remember.
- 3Encrypt and download the protected file.
You need
- An unlocked PDF
- A password you will remember
Honest limits
- Uses standard PDF encryption locally.
- If the file is already encrypted, unlock it first, then encrypt again.