How do I open a .MOBI file?

Drop a .MOBI file onto Analyser at https://lab.valjdakosta.com/ and it opens directly in your browser - no upload, no account and no software to install. Open Kindle and Mobipocket e-books (MOBI, AZW, AZW3 / KF8) in the browser: reads the title, author, publisher, language and cover, then renders the book section by section with prev/next paging. MOBI 6 and KF8 (including combo .mobi) are decoded on-device - nothing is uploaded.

Can I open a .MOBI file online for free?

Yes. Analyser is a free online .MOBI opener and viewer that runs entirely in your browser - your .MOBI file never leaves your device, so there is nothing to upload and no software to install. It even works offline once installed.

.MOBI file - what it is and how to open it online

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Home › Formats › .MOBIFull

What is a .MOBI file?

MOBI is an e-book format once used by Amazon Kindle. Opened by calibre and older Kindles.

Did you know: MOBI came from Mobipocket in 2000; Amazon adopted it for the Kindle, then retired it in 2022.
The format descends from PalmDOC, the document format of Palm OS handhelds, which is why MOBI books can also carry the .prc extension.
Amazon’s early Kindle AZW files were essentially Mobipocket books using its high-compression option, the two being near-identical without DRM.
What Analyser shows you: Open Kindle and Mobipocket e-books (MOBI, AZW, AZW3 / KF8) in the browser: reads the title, author, publisher, language and cover, then renders the book section by section with prev/next paging. MOBI 6 and KF8 (including combo .mobi) are decoded on-device - nothing is uploaded.
Open a .MOBI file: Drag a .MOBI file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
Related formats: .AZW · .AZW3. See all supported file types.