: Visit onenote.com and sign in with your Microsoft account.
While Microsoft does not officially release a "OneNote Portable" .exe file, the term generally refers to: Microsoft Onenote Portable
: Requires zero local files, making it ideal for devices where you cannot install software. : Visit onenote
where you can't install software, or are you just looking for a way to keep a physical backup of your notes? Microsoft Onenote Portable