How Can I Remove a Forgotten Password from a PDF File?

I have an old PDF file that I protected with a password, but I’ve completely forgotten what it was. I need to access the file urgently for important information, but I can’t open it due to the password.

Is there any safe and effective PDF password remover tool or method that I can use to unlock the file without damaging it? I’d prefer a free or reasonably priced solution if possible.