Open ONE files in your browser
A section of a OneNote notebook, all its pages in one file. Read every page right here, without OneNote. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your section opens as its pages, each under its title and date, its text where OneNote placed it.
- Every page • Text, tables, pictures and ink
- Contents • Jump to a page by its title
- Attached files • Each in its own viewer, never run
- Export • Save as PDF, PNG or JPEG
About ONE
OneNote keeps each section of a notebook in a .one file of its own: every page and its subpages, the boxes of text typed anywhere on them, tables, pictures, handwriting and the files dropped on them. A notebook is a folder of these beside a .onetoc2 that lists them, and Microsoft documents the format as MS-ONESTORE and MS-ONE.
People come across .one files in notebooks copied off a computer, in OneNote's backups, which it writes as .one files, and attached to emails. In 2023 attackers sent .one files with a program hidden under a picture that said to double-click it, and OneNote has blocked the riskiest attachments since.
Filepeek reads the section in your browser and sets each page under its title and date, its boxes of text where OneNote placed them, with their lists, tables, pictures and ink. Files attached to a page are listed in their place, an amber note names them, and each opens in its own viewer here, never run. Contents lists the pages, Search finds words on all of them, and Export saves them as PDF.
OneNote section
.one
Format
- MIME type
- application/onenote
- Made by
- Microsoft
- Released
- 2003
Inside the file
- Holds
- A section's pages and subpages
- Each page
- Boxes of text, tables, pictures and ink
- Attachments
- Files dropped on a page
- Written by
- OneNote on Windows
Opens in every browser
Filepeek opens OneNote sections in Chrome, Edge, Firefox and Safari. On their own, browsers download them, and only OneNote opens them.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Apps that open ONE
- WindowsOneNote, with a double click
- MacNo app opens it • OneNote for Mac only opens notebooks on OneDrive
- iPhone and iPadNo app opens it
- AndroidNo app opens it
Questions
How do I open a .one file without OneNote?
Drop it on this page or choose Peek a ONE. Its pages open with their text, tables and pictures, on a Mac or a phone too.
What happens to the files attached to a page?
Nothing in them runs. Each is listed where it was dropped, an amber note names any program or script, and it opens in its own viewer here only when you pick it. In OneNote, a double click on an attachment hands it to its own app, which runs a program.
Can it open a section downloaded from OneDrive?
Yes. A section downloaded from OneDrive or SharePoint comes packed the way OneNote syncs it, and it opens here like one saved by OneNote on Windows.
Can I open a whole notebook?
Drop the notebook's folder or all its .one files together, and each section opens in the file list. A .onepkg, the package OneNote exports a notebook in, opens as a folder of its sections.
Can I save the pages as PDF?
Yes. Choose Export, then Save as PDF. Every page is saved with its text, so the PDF can still be searched.