Free PDF Tool
Protect PDF
Add Password Free
Lock any PDF with a password using AES-256 encryption — the strongest PDF security standard. Perfect for protecting bank statements, salary slips, and sensitive documents before sharing. Runs entirely in your browser, nothing is uploaded.
Drag & drop your PDF here
or tap to browse
File never leaves your device
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Frequently Asked Questions
What encryption does this tool use?
AES-256 — the strongest PDF encryption standard, the same used by banks and government institutions. Your password is never sent to any server.
Can I protect a PDF that is already password-protected?
First remove the existing password using our Remove PDF Password tool, then add a new password here.
What happens if I forget the password I set?
There is no recovery option. Make sure to note down your password — or use our Remove PDF Password tool if you still remember the original.
Is the protected PDF compatible with all PDF readers?
Yes. AES-256 encrypted PDFs open correctly in Adobe Reader, Chrome PDF viewer, Apple Preview, and all major PDF applications.
Is my file safe?
The PDF is processed entirely in your browser. The password you set is used locally to encrypt the file — nothing is sent to any server.