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For a file you can already open: give cherrypdf the password once and get back a decrypted copy that does not ask for one, with the restrictions on printing and copying lifted too. This removes protection you are entitled to remove — it does not break into a document whose password you do not have.
Step by step
What it does
This tool runs entirely inside your browser tab. The file never leaves your machine, using it needs no sign-up, downloading needs only a free account, and nothing you download carries a watermark.
Questions
No. Removing the password only works on protection you are already entitled to remove. It is not a way into a document you are locked out of.
Then only the advisory permission bits are set and no password is needed. Removing the password lifts them too.
No. You get a new copy without the password, and can keep the original if you still need it.
No. The file is decrypted in this browser tab, so neither it nor the password leaves your machine.
The rest of them