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Password Protect PDF — Free Online
Lock a PDF with a password to prevent unauthorized access. Or remove a password from a PDF you already own. Free, instant, no account needed.
✓ Lock PDF with password✓ Unlock password-protected PDFs✓ No watermark✓ No signup
How to Protect or Unlock a PDF
Lock a PDF
- 1Upload your PDF
- 2Select "Lock PDF" and enter your password
- 3Click Apply — password is added immediately
- 4Download the protected PDF
Unlock a PDF
- 1Upload your password-protected PDF
- 2Select "Unlock PDF" and enter the current password
- 3Click Remove Password
- 4Download the unlocked PDF
Frequently Asked Questions
What encryption is used?
PDFs are protected with 128-bit RC4 or 256-bit AES encryption depending on the PDF standard version.
Can I remove a password I forgot?
No. Password removal requires you to know the existing password. This tool cannot bypass password protection.
Can I add an owner password too?
Yes. The Lock tool supports both a user password (to open) and an owner password (to restrict printing/copying).
Is this secure?
Files are processed in memory only. We do not store passwords or files after the operation.