or drop a PDF here · up to 95 MB
Files are deleted as soon as they are done
How to protect a PDF
- Choose your PDF. Select it or drop it into the box.
- Type a password. Type it twice to be sure. Use at least 8 characters, mixing letters and numbers.
- Download. The protected PDF asks for the password whenever someone opens it.
When to password-protect a PDF
Before you email a bank statement, salary slip, ID card scan, medical report or contract, add a password and share it by phone or a different chat. Even if the email is forwarded or the file leaks, it cannot be opened without the password.
How strong is it?
The PDF is encrypted with AES-256, the same encryption Adobe Acrobat uses. A long password (12 characters or more) cannot be guessed in any practical time. Short passwords like 1234 or your name can be guessed, so choose a good one.
Remember your password
We do not keep your password or your file, so nobody (not even us) can open the PDF if you forget it. Keep a copy of the original. To remove the password later, use Unlock PDF.
Frequently asked questions
How do I put a password on a PDF?
Select the PDF here, type your password twice and click Protect PDF. The downloaded PDF asks for that password when opened.
Is it free?
Yes. Protecting PDFs is free, with no sign-up and no watermark.
What encryption is used?
AES-256, the strongest encryption in the PDF standard, supported by Adobe Reader, Chrome, Edge, Preview and phone PDF apps.
Do you keep my password or file?
No. The file is encrypted on our server over HTTPS and deleted straight away; the password is not stored or logged.
What if I forget the password?
The PDF cannot be opened without it, by anyone. Keep the original file or write the password down somewhere safe.
Can I protect a PDF on my phone?
Yes. It works in the browser on Android and iPhone.