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Lock your PDF with a password in the browser. Fast, private, and free.
Choose the PDF you want to lock. Processing stays on your device.
Enter a user password (and optional owner password) to open the file.
Get an encrypted PDF that prompts for a password in any reader.
RC4 128-bit PDF encryption that works in Adobe Reader, Chrome, and more.
Files never leave your browser. We never see your document or password.
Protect in seconds. Fair daily limits for guests and free accounts.
Optional separate owner password; defaults to your open password.
Quick answers about tools, privacy, limits, and pricing.
Yes. Daily usage limits may apply for guests and free accounts; Premium can raise them.
No. Encryption runs entirely in your browser. Your PDF and password never go to our servers.
Any standard PDF reader (Adobe, Preview, Chrome, Edge, etc.) should prompt for the user password.
No. We never store passwords. Keep a safe copy of the password yourself, plus an unencrypted original if you may need one.
The tool applies RC4 128-bit style PDF encryption commonly supported by desktop and browser readers.
Use our PDF Unlock tool with the correct password to download an unlocked copy you own.
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