Accepted formats and choosing EPUB

Here are the formats in which you can publish your book:

  • ePub: the standard eBook format. We recommend this format as it is compatible with every one of our online bookstore partners and can be read on most devices. The ePub you upload must be validated by the ePubCheck tool

  • mobi: Amazon's proprietary format, for reading eBooks on Kindle apps and devices. In the case of the reflowable mobi file, the mobi you'll upload will be distributed to stores accepting this format but not to Amazon, who will instead create its own mobi file for its store. In the case of the fixed layout mobi (KF8), the file you'll upload will be the one used for sale on Amazon.

  • PDF: although not recommended, as it won't be published on major bookstores, you can upload a unprotected PDF file;

  • iBooks: you can also upload in Apple's proprietary format. This is only for iTunes' bookstore: for reading on iPads, iPhones and the iBook app on Mac. Note: The Apple iBookstore and app also sells and supports ePubs.

Why choose the .ePub format

We highly recommend the . ePub format because it is supported by most devices and reading apps.

Since 2007, .ePub has been the official standard of the International Digital Publishing Forum ( The main advantage is that it is “reflowable”. In simple terms, the flow of text is optimised and adapted to the display device and settings. This means that all your readers will have the optimum reading experience, whatever their device. For more information, visit and

There is also a Fixed Layout ePub, for books like comics or children books that need a fixed disposition in pages.

We also recommend the .ePub format because eBooks sold in PDF format could be not accepted by major stores.

How to get the .ePub format

So now you're convinced you want an ePub file, how can you get it?

There are 3 ways:

      1. You can create your own ePub eBook using StreetLib Write, the authoring tool to produce digital publishing content independently. Simply write your book with the editor of your choice (e.g. Word), sign up at, and build a professional-quality EPUB file. StreetLib Write is free, and requires no expert knowledge or skills of the software or formats.
      2. Alternatively, you can ask for the conversion from StreetLib Ready.
      3. You can create your ePub file using software such as InDesign, Calibre, or Sigil (if you are familiar with html and CSS coding). In this case, please be aware: 
      • We do not recommend building an ePub file using the tool provided by Google Docs because it will create an ePub that is not valid for sale and that cannot be used for publication. We do not recommend using automatic conversion tools provided by text editing software in general.
      • The fonts used in EPUBs can be easily extracted, therefore they must be license-free. In the case of licensed fonts, we suggest that you check what the license terms of use for digital files are. 
      •  If you decide to use InDesign or Calibre, please pay attention to all the technical details, but most importantly please make sure that the final ePub file is VALID from a structural point of view. Please remember that the ePub you upload must be validated by the ePubCheck tool

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