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eBook File Types

eBook files are digital books designed to be viewed on eReaders, such as the Amazon Kindle, Sony Reader, Barnes and Noble Nook, and the iPad. However, they can often be viewed on a PC using eReader software as well. While many eBook formats can be viewed on multiple devices, some proprietary eBook formats can only be viewed using specific hardware or software.

Common eBook file extensions include .EPUB, .AZW, and .LIT.

Extension File Description Popularity
.acsmAdobe Content Server Message File★★★★☆
.aepActiv E-Book Project★★☆☆☆
.apnxAmazon Page Number Index File★★★☆☆
.avaAvaaBook eBook★☆☆☆☆
.azwAmazon Kindle eBook File★★★★★
.azw1Amazon Topaz eBook★★★★☆
.azw3Amazon KF8 eBook File★★★★☆
.azw4Amazon Print Replica eBook★★★★☆
.bkkBookBuddi eBook File★★★☆☆
.bpnuebPNU eBook File★★☆☆☆
.cbcComic Book Collection★★☆☆☆
.cebApabi eBook File★★★☆☆
.dnlDNAML eBook File★★★☆☆
.ebkeBook Pro eBook File★★★☆☆
.ednAdobe eBook Activation File★★☆☆☆
.epubOpen eBook File★★★★★
.etdAdobe Reader EBX Transfer Data File★★★☆☆
.fb2FictionBook 2.0 File★★★★☆
.fkbFlipkart eBook File★★★☆☆
.html0Book Designer File★★☆☆☆
.htmlzZipped HTML eBook★★★☆☆
.htxtHanvon eBook File★★☆☆☆
.htz4HyperMaker 4 Publication★☆☆☆☆
.htz5HyperMaker 5 Publication★★☆☆☆
.koobKoob E-Book File★☆☆☆☆
.liteBook File★★★★☆
.lrfSony Portable Reader File★★★★☆
.lrsLibrie Reader Source File★★★☆☆
.lrxSony Portable Reader File★★★☆☆
.martMartView eBook File★★★☆☆
.mbpMobipocket Notes File★★★☆☆
.mobiMobipocket eBook★★★★★
.ncxEPUB Navigation Control XML File★★★☆☆
.oebOpen eBook File★★☆☆☆
.opfOpen Packaging Format File★★★☆☆
.pefPEF Braille Book File★★☆☆☆
.phlKindle Popular Highlights File★★★☆☆
.pmlPalm Markup Language File★★☆☆☆
.pmlzZipped Palm Markup Language File★★☆☆☆
.pobiKindle Touch Periodical File★★☆☆☆
.prcMobipocket eBook File★★★★☆
.qmkYanCEyDesktop Quickmarks File ★★☆☆☆
.rzbRed Zion Book File★★★☆☆
.rzsRed Zion Security File★★★☆☆
.snbShanda Bambook eBook★☆☆☆☆
.tcrPsion Series 3 eBook File★★★☆☆
.tk3TK3 Multimedia eBook★★★☆☆
.tpzKindle Topaz eBook File★★★★☆
.trTomeRaider 2 eBook File★★☆☆☆
.tr3TomeRaider eBook File★★★☆☆
.vbkVitalSource eBook★★★☆☆
.webzWEBZ Compressed eBook File★★☆☆☆
.ybkYanCEyWare eBook★★★☆☆