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Free PDF tool

Protect PDF with Password

Add a password to your PDF so only authorized people can open it. Encryption runs entirely in your browser — your file stays private.

Private by default

Your files stay in your browser.

Fast

Built for quick document tasks.

Free

No account or paywall.

Click or drag a PDF here

Remember your password. There is no way to recover a lost PDF password once set.

How to use it

  1. 1Upload your PDF file by clicking or dragging it into the drop zone.
  2. 2Enter a strong password and confirm it.
  3. 3Click 'Protect PDF & download' — the password-protected file downloads instantly.

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FAQ

Is my PDF sent to a server?

No. The encryption is applied in your browser using pdf-lib. Your file and password never leave your device.

What happens if I forget the password?

There is no recovery option. Write your password down in a safe place before setting it.

What level of encryption is used?

pdf-lib applies standard PDF encryption. The result is compatible with Adobe Reader and all major PDF viewers.

Can I still print the protected PDF?

Yes, low-resolution printing is permitted. Copying text and editing are restricted by default.