Easily protect any PDF file in your Google Drive with a password and add restrictions around printing, commenting, and annotations. Send the encrypted PDF files via email without leaving Google Drive. The PDF toolbox can also password protect native Google file formats include Google Documents, Google Spreadsheets and Google Slides presentations. The files are first converted to PDF files and then encrypted with the specified password. The Google Drive API can only export files that are 10 MB or less in size. Similar size restrictions thus apply to the PDF toolbox app as well. PDF toolbox is developed by Amit Agarwal, the developer behind several popular Google Workspace add-ons including Mail Merge with Attachments, Document Studio and Google Forms Notifications. The app is currently in beta and completely free during the beta period.