Password Protect PDF
Lock a PDF with a password so it can't be opened without one. Drop in the file, choose a password (and, if you like, restrict printing, copying or editing), and download the encrypted copy. The whole thing happens on your device — the PDF and your password are never uploaded.
- 100% free
- Private & safe
- Runs in your browser
Your files are processed securely in your browser and are not uploaded to our servers.
Why use Password Protect PDF?
Password Protect PDF works on your documents locally, so you get the result in seconds with no watermarks, no sign-up and no files leaving your device.
- 100% private: files are processed in your browser and never uploaded.
- Completely free, with no account, no watermarks and no usage limits.
- Handles Input/Output: PDF (.pdf); Encryption: standard PDF password encryption (AES).
- Add the PDF you want to protect (it must open without a password already).
- Works on any device — desktop, tablet and phone — and is fully keyboard accessible.
How to use Password Protect PDF
- Add the PDF you want to protect (it must open without a password already).
- Enter a password and confirm it — this is what people will need to open the file.
- Optionally choose whether readers may print, copy text, or edit the document.
- Click Protect & download to get the encrypted PDF.
Examples
- Adding a password to a contract before emailing it.
- Locking a financial statement so only the recipient can open it.
Supported formats & limits
- Input/Output: PDF (.pdf)
- Encryption: standard PDF password encryption (AES)
Limitations
- The source PDF must already open without a password.
- There is no way to recover the file if you forget the password — store it safely.
- Permission settings (print/copy/edit) are honoured by most, but not all, PDF readers.
Frequently asked questions
Is my PDF or password uploaded?
No. The file is encrypted entirely in your browser and neither the document nor the password ever leaves your device.
What if I forget the password?
It cannot be recovered. Anyone (including you) needs the password to open the file, so keep it somewhere safe.
Can I remove a password later?
You can remove owner/permission restrictions with the Unlock PDF tool, but only if the file opens without an open-password.