Google Chrome has a built-in PDF reader* and a PDF writer and we can combine the two features to remove the password from any PDF document.
Just follow the steps outlined below:

1. Drag any password protected PDF file into your Google Chrome browser. If you can’t find one,
use this sample PDF file – the open password is “labnol” without the quotes.
2. Google Chrome will now prompt you to enter
the password of the file. Enter the password and hit Enter to open the file.
3. Now go to the File menu in Google Chrome and
choose Print (or press Ctrl+P on Windows or Cmd+P on Mac). Choose the destination printer as “Save as PDF” and click the Save button. Google Chrome will now save the PDF to your desktop but without the password protection. If you re-open this PDF in Chrome, it would no longer require a password to open.

Alternatively, if you have enabled Google Cloud
Print, you can choose the destination as “Save to
Google Drive” in the print dialog and the unprotected version of the PDF will be sent straight
to your Google Drive from Chrome.
[*] Open the special page chrome://plugins and
enable the option that says “Chrome PDF Viewer”
to let Chrome natively handle PDF files.