Why Amazon Dropped MOBI for EPUB and How Browsers Can Convert Files Privately

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Amazon formally phased out MOBI support for its Send to Kindle service in late 2022, pushing users toward the EPUB format instead. MOBI, originally created by Mobipocket in 2000 and later acquired by Amazon in 2005, lacked modern typography features such as CSS layouts, SVG support, and dynamic dark mode styling. EPUB, standardized by the W3C and IDPF, is built on HTML5, CSS3, and XML, making it far better suited to contemporary Kindle rendering engines. When users sought alternatives to convert their existing MOBI libraries, many turned to online tools that upload files to third-party servers, raising serious privacy concerns around data retention and exposure. Modern browser technologies like WebAssembly and FileReader APIs now enable fully client-side MOBI-to-EPUB conversion, meaning files never leave the user's device.

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