Remove password protection from a PDF you already know the password to, so it opens without a prompt.
Yes — this removes protection from a file you can already open; it doesn't recover or crack an unknown password.
No — your password is only used to open the file for this operation and isn't stored afterward. Both the file and the password are handled inside your browser.
No. This tool is only for removing protection from documents you can already open with the correct password. It does not guess, crack, or bypass unknown passwords, and it shouldn't be used on documents you aren't authorised to access.
An open (user) password is the one a PDF asks for before it will display at all — that's what this tool removes when you supply it. Owner passwords that only restrict printing or copying are a separate mechanism and aren't the target here.
Usually so a document you own can be merged, searched, printed, or archived without retyping the password every time. Keep an eye on where the unlocked copy ends up if the contents are sensitive.