Password Protect PDF
Add strong password protection to your PDF — encryption happens in your browser, so the file never leaves your device.
Drop a PDF here
or browse your computer · PDF only
One PDF · up to 650 MB
PDFCreature's free Protect PDF tool adds password-based encryption to any PDF in seconds. Lock confidential documents, share PDFs safely, and keep printing and copying restricted to people you trust — all from your browser.
Why use this PDF tool?
Add a strong PDF password
Encrypt your PDF with a user password so only people who know it can open the file.
Password strength meter
Get instant feedback so you choose a password that's actually secure.
Restrict copy and edit
Protected PDFs disable copying, editing, and unwanted modifications by default.
Free and private
Encryption happens in your browser — your PDF is never uploaded to a server.
How to password protect a PDF
- 1
Upload the PDF you want to protect.
- 2
Choose a strong password (8+ characters with mixed case and a number or symbol).
- 3
Confirm the password and click "Protect PDF".
- 4
Download the password-protected PDF and store the password safely.
Frequently asked questions
How strong is the PDF encryption?
The Protect PDF tool applies standard PDF password encryption supported by all major PDF readers.
Can I unlock a PDF without the password?
No. If you lose the password, the protected PDF can't be opened. Always keep a copy of the password somewhere safe.
Is the password sent to a server?
No. Your password and PDF stay in your browser — encryption runs locally.
Can I protect a PDF that's already encrypted?
Remove the existing password first using your PDF reader, then re-protect it with PDFCreature.