Amazon's Send to Kindle service began accepting EPUB files in 2022, announced through the service's own documentation and email to users ahead of the change — meaning every current Kindle can receive the open e-book format through Amazon's delivery channels, rather than only Amazon's store formats. The catch that matters: the service converts EPUBs into Amazon's own formats on delivery, per Amazon's help pages, so the open file becomes an Amazon-format file the moment it lands. Inkless Books covered this from Amazon's published documentation; no device was handled.
It closed a decade-long absurdity with a decade-long asterisk. Kindles were the last major e-readers that could not take an EPUB by any official route; now they can — through a pipe that rewraps the file on the way in.
What actually shipped?
A format change to the Send to Kindle pipeline, which delivers personal documents to registered devices by email, app upload, or web browser. Before the 2022 change, EPUB was the notable unsupported format — Mobipocket and PDF went through, and the standard workaround was converting EPUBs in third-party software first, a workflow the e-reader forums ran on for years. After the change, per Amazon's documentation, EPUB goes through natively and arrives readable. The MOBI format was retired from new sends in the same wave — Amazon's own docs note MOBI support ended for the newest devices, a detail of the same announcement that most coverage treated as a footnote.
What does the conversion mean for readers?
Mostly nothing visible, sometimes something. Conversion preserves the text but not always the typography: complex layouts, embedded fonts, and heavy formatting can shift in translation, a limitation conversion tools of every brand share. The deeper meaning is structural — an EPUB delivered this way enters Amazon's ecosystem as an Amazon-format file subject to the personal-documents system's storage terms, not as the portable open file it began as. Amazon's documentation describes the personal-documents service and its storage limits; what the file becomes after delivery is Amazon's question to answer in future policy, and 2024's documentation already shows personal-documents syncing evolving toward the "Books" library integration.
What does it change for DRM-free buyers?
The practical win is real: purchases from independent publishers, public-domain libraries like Project Gutenberg, and direct-from-author sales can now reach a Kindle without third-party conversion software — one fewer reason to leave the biggest device platform, which is precisely Amazon's interest in the change, an incentive worth naming plainly. What it does not change: DRM. Encrypted EPUBs from other stores still do not convert, by design — and removing that encryption is not something this publication advises on. The interoperability Kindle gained is interoperability on Amazon's conveyor.
What did the announcement not settle?
Native EPUB rendering — Kindle devices still do not open EPUB files placed on the device directly, per Amazon's format documentation; the conversion happens in the delivery service. And the long-term home of personal documents is in motion, per the service's own evolving terms. What the record establishes is a door opened in 2022, with the file changing clothes at the threshold. Whether Amazon ever lets the open format in without conversion is a question no documentation yet answers.
For more context, read Which E-Reader Handles Library Books Best?.
For more context, read Can You Read Library and Purchased Books on Any E-Reader?.
For more context, read How to Read Library E-Books on a Kindle (and When You Can't).