"Password protect this PDF" sounds like a single action, but it's worth understanding what it actually does before you rely on it. A password-protected PDF is encrypted — the content itself is scrambled and can only be read by software that has the correct password to decrypt it. That's different from a PDF that merely disables copy/paste or printing (a much weaker, cosmetic restriction). When most people say "protect," they mean the strong version: nobody can even open the file without the password.
How to add a password
- Open the Protect PDF tool and upload your file.
- Type a password and confirm it. Use something you'll actually remember — there's no recovery option if you forget it.
- Click Protect PDF & download. The password-protected copy downloads immediately.
Behind the scenes, this particular tool renders each page locally in your browser and re-encrypts the result with real PDF encryption — it never uploads your file to make this happen. The trade-off is that the output is image-based, so text won't be selectable afterward; for a document you're locking down to share securely, that's rarely a problem.
How to remove a password later
Once a protected PDF has served its purpose — you've shared it with the one person who needed it, or you no longer need the extra layer — you can strip the password with the Unlock PDF tool. Upload the file, enter the password when prompted, and an unprotected copy downloads automatically. If a PDF only has owner-level restrictions and no actual open password, the tool detects that and gives you a clean copy immediately, keeping the original text intact.
A few things worth knowing
- You must know the password to remove it — this only works for files you own or have legitimate access to.
- Password protection is not the same as redaction. A password stops someone from opening the file; it doesn't remove or black out sensitive content inside it.
- Both tools run entirely in your browser, so neither your file nor your password is ever transmitted anywhere.