Protect PDF with Password – 100% Free
Encrypt your PDF with AES-128 and a custom password. Set permissions for printing, copying, and editing – no watermark, no registration.
- Is it free to password protect a PDF?
- Yes, completely free. No sign-up, no watermark, no limits.
- What encryption does it use?
- AES-128 encryption (the PDF Standard Security Handler) – the same standard used by professional PDF editors like Adobe Acrobat. The password-protected PDF opens in all standard PDF viewers.
- What is the difference between user password and owner password?
- The user (open) password is required to open the PDF. The owner password controls permissions – it allows the owner to change printing, copying, and editing restrictions. If you only set a user password, the same password controls all permissions.
- Can I control what users can do with the PDF?
- Yes. You can individually allow or restrict printing, copying text, and editing or annotating the document. These permissions are encoded into the encrypted file.
- Are my files uploaded to a server?
- No. All encryption happens locally in your browser. Your PDF and password never leave your device.