A common, everyday need
Banks, HR departments, and government portals often send PDFs locked with a password — usually something predictable like the last four digits of an ID number. That's useful for the first time you open the file, but annoying every time after. Once you know the password, there's no reason to keep re-entering it, especially for a document only you will ever access.
What this does and doesn't do
Removing a password with a tool like this requires the correct password as input — it decrypts the file and saves a clean copy without protection. It is not a way to break into a file you don't have permission to open; without the right password, the tool simply won't be able to unlock it.
Before you remove the password
Consider whether the document should stay protected. If you'll be storing or forwarding the file somewhere less secure than where it currently lives, keeping the password might still be worthwhile. Removing it makes sense mainly for personal, private storage where the extra step of entering a password each time isn't adding real security.
Unlock your file
The PDFGuy Unlock PDF tool removes a known password from a PDF entirely in your browser — your file and password are never uploaded anywhere.