How to remove passwords from PDF

To remove password security from a PDF, follow these steps:
Launch Acrobat Reader to view the PDF.
Use the “Unlock” tool as follows:
Select “Tools” > “Protect” > “Encryption” > “Remove Security.”
Security should be removed:

The options differ depending on the type of password security associated with the document.
If the document has a Document Open password, remove it by clicking “OK.”

If the document requires a permissions password, enter it in the “Enter Password” box and click “OK.” To confirm the action, click “OK” once more.