Those who use an Amazon Kindle to read their e-books have surely noticed a small but sad detail: do not accept EPUB, the most popular e-book format. If we have a book in EPUB, the only way we have to put it on the Kindle is to pass it through Caliber and convert it to MOBI.

That, however, appears to be close to changing. And it is that Amazon has updated the official documentation of “Send to Kindle” to reflect that its eReaders already accept EPUB format. Not bad at all, it’s only taken Amazon 15 years to do it, but there are a few things to keep in mind.

EPUB yes, but with some things


To understand the importance of this support, we have to know that Amazon isn’t the only company selling e-books.. There are other stores and even authors that offer their digital books in EPUB format. That Amazon embraces (a little) this format is, without a doubt, good news for readers who use their devices.

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This format has been on the market since 2007, like Amazon’s Kindle. The problem is that Amazon decided to bet on MOBI (for a reason he bought Mobipocket in 2005) and AZW, which is an Amazon MOBI. But EPUB, which today is the most widespread format, no.

To date, users who wanted to send their EPUB to Kindle had to use some software like Caliber to convert it to MOBI, for example. Now with the “Send to Kindle” feature, we can send EPUB to our Kindle in a “native” way. Yes, with quotes.


“Send to Kindle” is a feature that allows you to send books, PDFs, or other documents to devices registered with your Amazon account. It’s as easy as sending the attachment in an email and even has dedicated apps for PC or Mac. This is the feature that EPUB will support, but it will convert the file to KF8 format (also called AWZ3).

Basically, AWZ3 is an EPUB file with certain technical characteristics from Amazon. It is somewhat similar to what happens with Kobo eReaders, which convert EPUBs to KEPUBs. In other words, there will be support for EPUB, but only halfway.

On the plus side, you won’t have to use additional software to send the book to your Kindle using the “Send to Kindle” feature, and you’ll be able to import books purchased from non-Amazon stores. The negative, and at least until further notice, is that if we want to export the file to the Kindle via USB we will have to continue going through Caliber and the conversion.

Via | Goodreader

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