Protect PDF file
Encrypt your PDF with a password to prevent unauthorized access to the file content.
or drop PDFs here
Your files are processed in your browser and never uploaded to any server.
How to use Protect PDF
- 1Select your PDF file.
- 2Type a password and choose the permissions you allow.
- 3Click “Protect PDF” and download the encrypted file.
About Protect PDF
Documents are encrypted with AES-256, the strongest standard PDF encryption, which is supported by Adobe Acrobat and all modern PDF readers.
- No upload – 100% private processing on your device
- Free with no watermark and no sign-up
- Works on Windows, Mac, Linux, Android and iOS
Frequently asked questions
Is my password sent anywhere?
Never. Encryption is performed on your device, so neither your file nor your password is transmitted.
Is Protect PDF free to use?
Yes, completely free. No registration, no watermarks and no daily limits.
Are my files safe?
Your files never leave your device. All processing happens locally in your web browser, so nothing is uploaded to any server.
Does it work on mobile phones?
Yes. It works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux – no app installation needed.