PDF vs. EPUB vs. Mobi Format Download Comparison for oreilly.com

UPDATE: Additional view showing relative volume, rather than percentage.

I’m honored to have been elected to the IDPF Board of Directors, and will use the occasion to share some interesting data about download formats from oreilly.com.

For most of our titles, we offer three different (DRM-free) formats: PDF, EPUB, and Kindle-compatible Mobipocket. PDF continues to be the most popular format, though it’s losing ground to EPUB (and to a lesser extent, Mobi). We’ve been tracking which of those three formats customers actually download after purchasing (it’s of course possible that they download multiple formats), and here’s the breakdown over the last 16 months:


And here’s the same data in terms of relative volume, rather than percentages:

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