Is the original changed?

No — you get a separate unlocked copy. Your original stays as it is.

What if I forgot the password?

Then start with recovery instead: give the hints you remember and we’ll try to find it first.

How to remove a password from a PDF permanently

If you own a PDF and know its password, you don’t have to type it every single time you open the file. You can save a clean copy with the password removed.

Here’s how to permanently remove the password from a PDF you own.

Remove my PDF password