With the file open in Pages, Numbers, or Keynote, select File and then Set Password to choose and apply your password.

Learn how to zip and unzip files on your Chromebook by reading this guide.

Don't how to create or unpack a ZIP file using a Chromebook? Here are easy instructions that don't require third-party software, along with two alternatives.

How to encrypt and password-protect ZIP files the right way This tip was originally published on IDG Answers, a reader-powered help desk for answering tech questions.

When you "zip" a file, you'll compress its data and reduce how much space it takes up on your computer or phone.