Free · no sign-up · runs in your browser, nothing uploaded
Lock a PDF with a password so only the right people can open it. Good for quotes, contracts and anything with personal details. Free, in your browser.
Prefer a full window? Open the tool on its own page →
It uses standard PDF encryption. Choose a password you can share safely by phone or text, not in the same email.
Can I remove a password later?Yes — the Unlock tool in the full PDF set does that, if you know the password.
Is the file uploaded?No. Encryption happens on your device.