OneNote is one of the most effective tools for staying organized. How to Organize OneNote for a Productive System OneNote has organizational features that let you do more with it than just keep notes. We show you how to use them effectively. Read more. You can use it to record recipes, manage to-do lists, and file receipts. 6 of the Best Apps to Scan, Track and Manage Receipts These receipt scanner apps will help you scan, save and organize each receipt for your personal or business needs. Read more.
However, if you're using OneNote for highly sensitive documents, extra precautions are essential to prevent data from falling into the wrong hands.
One of the most reliable ways to secure your notes is by adding a password.
Unfortunately, you can't password-protect entire notebooks. Protection is limited to individual sections within a notebook.
Adding a password is straightforward. Open OneNote, locate the section you want to protect, right-click its name, and select Password Protect This Section.

A panel will appear on the right. Click Set Password, enter your password twice, and hit OK. To remove it later, go to Password Protect This Section > Remove Password.

Lock all password-protected sections instantly with Ctrl + Alt + L, or right-click a section and select Password Protect This Section > Lock All.
Before relying on passwords in OneNote, consider these key points.
First, Microsoft fully encrypts password-protected sections. If you forget your password, Microsoft cannot recover it or unlock your notes. Always use a trusted password manager. You Need to Start Using a Password Manager Right Now Now everyone should be using a password manager. In fact, not using a password manager puts you at higher risk of being hacked. Read more.
Second, locked sections won't appear in OneNote's search results. You must unlock them first to access or search their content.
Are OneNote passwords a valuable part of your workflow? Do you trust them for security, or do they slow you down? Share your experiences in the comments below.