The oddities of eBook file sizes

When I started building the .mobi and .epub version of Pay Me, Bug! I immediately noticed a disparity in file sizes. The .epub weighed in at 600K–not too bad, in my opinion–while the .mobi, which was essentially the exact same book, only in a different format, was 1.2mb. I thought that was an amazing delta–what was .mobi doing that was making the file so large? It wasn’t DRM, because I don’t use it.

Anyway, when I sent the .mobi file in to the Kindle Direct Publishing tool, Amazon technology took the file and converted it into the new kindle standard, and it came out the other end at… 600K.

“Huh,” I said.

When I sent the .epub file in to the PubIt Publishing tool, Barnes and Noble technology took the file and converted it into the nookbook format, and it came out the other end at… 1.2mb.

“Huh,” I said.

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