How to add or remove a PDF password online
To protect a PDF with a password:
- Select "Protect" mode — Choose the protect option.
- Upload your PDF — Click to select or drag and drop your file.
- Enter a password — Type and confirm the password you want to set.
- Download — Click "Protect" and download the encrypted PDF.
To remove a PDF password:
- Select "Unlock" mode — Choose the unlock option.
- Upload your protected PDF — Click to select or drag and drop your file.
- Enter the existing password — Provide the current password to unlock the file.
- Download — Click "Unlock" and download the unprotected PDF.
Why use desPDF for PDF password protection?
- 100% private — All encryption and decryption runs locally in your browser. Your PDF and password never leave your device.
- AES-256 encryption — Industry-standard encryption, the same level used in professional PDF software.
- No server risk — Because nothing is uploaded, there is zero risk of your confidential document being intercepted or stored.
- Completely free — No subscription, no account, no hidden fees.
- Works on all devices — Desktop, tablet and smartphone in any modern browser.
Frequently asked questions
Is my PDF uploaded to a server?
No. Everything — encryption, decryption, processing — happens entirely in your browser. Your PDF and your password never leave your device.
What encryption standard is used?
AES-256, the same standard used in professional PDF editors like Adobe Acrobat.
Can I recover a PDF password I forgot?
No. The unlock feature requires the correct existing password. It cannot bypass or crack an unknown password.
What happens if I enter the wrong password in unlock mode?
The tool will show an error. You must enter the correct password to unlock the file.