ONE (OneNote)
Also known as: .one file, OneNote notebook, OneNote section
ONE is the file format Microsoft OneNote uses to store a notebook section — typed and handwritten notes, images, and clippings on freeform pages. Modern OneNote keeps notebooks in the cloud, so loose .one files are mostly local or exported copies.
- Microsoft OneNote notebook-section file
- Holds text, ink, images, and attachments
- Modern notebooks sync via OneDrive; export to PDF
What a .one file is
OneNote organizes content into notebooks made of sections, and each section is a .one file holding its pages. A page can mix text, ink, images, audio, and embedded files freely, without the rigid layout of a word document.
Today most notebooks sync through OneDrive rather than living as standalone files, so you usually interact with OneNote, not the .one files directly.
Opening and exporting
OneNote opens .one files natively. To share notes with people who do not use OneNote, export a page or section to PDF from the app.
Section files can grow if you paste in many images or attachments. For long-term archival or sending to others, a PDF export is the most portable option.