Password Protect PDF Online — Free Encryption Tool
Add strong password protection to any PDF document. Set a user password that must be entered to open the file — all encryption happens locally with no server uploads.
Drop file here or click to browse
Files stay on your device · Up to 200 MB
Drop multiple files or click to browse
Select multiple files · Up to 200 MB each
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How to Use Protect PDF
Why Use Our Protect PDF Tool?
Confidential reports, HR documents, legal filings, and financial records should be encrypted before sharing. Our tool applies 128-bit AES encryption in your browser — your unencrypted file is never sent anywhere.
Frequently Asked Questions
128-bit AES, which is the standard used by enterprise PDF tools and is extremely strong.
Currently a single user-open password is set. Owner permissions (print, copy restriction) are planned.
No — everything runs client-side. The password is never sent to any server.
There is no recovery — keep your password safe. Use our Unlock PDF tool only if you already know the password.