MOBI Reader

About MOBI Reader

MOBI Reader opens Kindle ebooks directly in your browser, with no Kindle app, no Amazon account and nothing to install. Drop in a DRM-free .mobi, .azw3, .azw or .prc file and start reading. The table of contents lists every chapter, including the chapters inside each part of the book, the arrow keys and the Previous and Next buttons move through the book, and full text search finds any word or phrase. Links inside the book, such as footnote references and contents entries, take you to the right place. You can switch between light, sepia and dark themes, choose a serif or sans serif font, and change the text size, line spacing and page width, and the reader remembers your settings and where you stopped in each book. Both the older MOBI format and the newer KF8 format used in AZW3 files are supported. The book is opened in your browser and never uploaded, and its content is cleaned and shown in a sandboxed frame. Books bought in the Kindle store are DRM protected and only open in Kindle apps. To keep the book in a format other reading apps understand, convert it with MOBI to EPUB Converter, and to print it use MOBI to PDF Converter.

MOBI files are everywhere in older ebook collections because the format was the Kindle standard for years, but outside Amazon software very few apps can open them. Apple Books cannot, Google Play Books cannot, and Windows and macOS have no built-in viewer. A browser reader fills that gap. This one unpacks the MOBI in your device memory: it decompresses the text records, rebuilds the chapters (from page breaks in older MOBI files, or from skeleton and fragment tables in KF8 and AZW3), restores links that the format stores as byte positions, and extracts the images and the cover from their records. The rebuilt chapters are then shown with the same engine as the EPUB Reader, with its themes, fonts, search and saved position. Two kinds of Kindle files cannot be opened. Books bought in the Kindle store are encrypted with DRM, and Topaz files (.azw or .tpz) store pages as glyph images rather than text. Every other MOBI, from public domain libraries to books exported from Calibre or sent by authors, opens without the Kindle app.

How to use MOBI Reader

  1. Drop a .mobi, .azw3 or .azw file into the box, or click to select it.
  2. Read with the contents list, the arrow keys, or the Previous and Next buttons.
  3. Adjust theme, font, text size, spacing and width, or search the whole book.

Frequently Asked Questions

How do I open a MOBI file?
Drop the .mobi file into the box above, or click the box and choose it. The book opens right away in this page, on Windows, Mac, Linux, Chromebook, Android or iPhone, without installing the Kindle app. AZW3 files open the same way.
Can I read MOBI files without the Kindle app?
Yes. This reader runs in any modern browser and needs no Amazon account. It works with DRM-free MOBI and AZW3 files, for example from Project Gutenberg, Calibre, authors and publishers. Books bought in the Kindle store are DRM protected and only open in Amazon apps and devices.
Will it remember where I stopped reading?
Yes. The chapter and scroll position are saved in this browser for each book, together with your theme and font settings. Opening the same book again on the same device continues from that place. Clearing your browser data resets it.
Does it work on a phone or tablet?
Yes. The reader works in mobile browsers, the toolbar adapts to small screens, and full screen mode hides everything except the book. On iPhone and iPad, where Apple Books cannot open MOBI files, this is a quick way to read one.
Why does my book show a DRM error?
Kindle store books are encrypted with Amazon DRM. Their text cannot be read by anything other than Amazon software, and this reader does not remove DRM. Only DRM-free MOBI and AZW3 files can be opened here.
Is the book uploaded anywhere?
No. The file is opened and displayed entirely in your browser and never leaves your device. Only your reading position and settings are saved, locally in this browser.

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