PDF Tools
Protect PDF
Lock a PDF with a password so the protected copy asks for the password before it opens. Choose whether to allow printing, copying, or editing.
Free · Runs in your browser · No signup · Files stay on your device
Select a PDF to lock with a password.
Upload a PDF and enter a password to lock it.
How to use
How to use Protect PDF
- 1Upload a PDF file.
- 2Enter and confirm the open password.
- 3Choose whether readers can print, copy, or edit the protected PDF.
- 4Click 'Protect PDF and Download' to create the encrypted copy.
Tips
Quick tips
- The protected PDF is encrypted with a user password.
- Printing, copying, and editing permissions can be allowed or blocked before download.
- Keep the password somewhere safe. The file cannot be opened without it.
- Use Test lock to confirm your PDF viewer asks for the password.
FAQ
Frequently asked questions
Does this add real password protection?
Yes. The output PDF is encrypted with an open password, so PDF readers should ask for that password before showing the document.
Can I stop printing, copying, or editing?
Yes. Turn those permissions off before creating the protected PDF. Some PDF readers may handle permissions differently, but the password lock is applied to the file.
Is my file uploaded?
No. The PDF is encrypted in your browser with a QPDF WebAssembly engine. Your file and password stay on your device.
Should I compress before or after protecting?
Compress before protecting. Once a PDF is encrypted, other tools usually need the password or an unlocked original before they can process it.
Does this change the visible PDF pages?
No. Protect PDF encrypts the file and applies permission settings. It does not add a watermark, flatten forms, or lower image quality.
Can I recover a forgotten password?
No. Keep the password somewhere safe. If you forget it, use your original unprotected file.
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