Microsoft OneNote

Overview

OneNote was first released by Microsoft in 2003 as part of the Microsoft Office suite, built around the idea of a free-form digital notebook rather than a linear document — pages can hold typed text, handwriting, images, and audio placed anywhere on the page, organized into a notebook/section/page hierarchy similar to a physical binder. It has since been bundled free with Windows and offered as a separate free download on other platforms, while remaining tied to a Microsoft account for sync.

OneNote is closed source, and notes are stored in a proprietary binary .one file format inside OneDrive; there’s no self-hosted or offline-first storage option, and exporting years of notes to another tool typically means converting away from that format. Microsoft has increasingly gated newer features — including its Copilot AI tools inside OneNote — behind a paid Microsoft 365 subscription, while core notebook, section, and page functionality remains free.

Key Features

• Free-form pages — Text, handwriting, images, and audio can be placed anywhere on a page, not just top-to-bottom
• Notebook/section/page hierarchy — Notebooks contain sections, which contain pages and page tabs, mirroring a physical binder
• OneDrive sync — Notebooks sync automatically across devices through a Microsoft account
• Microsoft 365 integration — Links with Outlook, Word, Excel, and Teams for embedding and referencing content
• Handwriting and drawing — Native ink support for stylus and touch input on tablets
• Search across notebooks — Full-text search, including text found inside images

Use Cases

• Meeting notes — Freeform pages for notes during calls, often referenced from Outlook or Teams
• Handwritten notetaking — Stylus-based note-taking on tablets and 2-in-1 laptops
• Personal organization — Notebooks split into sections for different areas of life or work
• Microsoft 365 users — Teams already using Outlook, Word, and Excel who want notes integrated with those tools

Who It’s For

OneNote is aimed at people already using Microsoft 365 who want a free-form digital notebook tightly integrated with Outlook, Word, and Teams. It’s a weaker fit for anyone who wants to own their note files in an open, portable format or avoid dependency on a Microsoft account and OneDrive, since all storage and sync run through Microsoft’s closed infrastructure.