Removing encryption is useful for an approved archive, an automated workflow or a file you own. You need the current password, and you should only unlock documents you are authorized to change.
The unlocked result is easier to open—and easier for anyone who obtains it to read—so decide where it will be stored before processing.
Unlock the authorized file
Open Unlock PDF, select the encrypted document, enter its current password, and process it. The password should be used only to decrypt the input; it should not appear in the output filename or logs.
Confirm the result
Download the new copy, close the browser preview, and reopen it. It should no longer ask for the password. Check the page count, attachments, bookmarks and signatures. Changing an encrypted file can affect signature validation, so preserve the signed original when authenticity matters.
Handle the unlocked copy safely
Move it to its intended protected folder, restrict sharing permissions, and remove unnecessary temporary copies. If the purpose was only a one-time conversion, consider whether the unlocked file needs to be retained at all.