Edit & secure PDFs
Lock a PDF with a password, remove one you know, stamp a watermark — plus sign, edit and redact.
Edit & protect — all tools
The Secure tools control who can open your document and how it’s marked. Protect adds strong password encryption, Unlock removes a password you already know, and Watermark stamps text like “CONFIDENTIAL” across the pages. You can also sign, edit and securely redact — all right in your browser.
These tools run in your browser, so your passwords and confidential files never leave your device — nothing is uploaded, and we never add a watermark of our own.
Frequently asked questions
How do I password-protect a PDF?
Protect PDF encrypts the file with a password you choose, so it can’t be opened without it.
Can I remove a password from a PDF?
Yes — Unlock PDF removes a password from a document you already have the password for.
Is my password sent to a server?
No. Protecting and unlocking happen in your browser, so the password and the file never leave your device.