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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 Rating
.azwAmazon Kindle eBook File4 stars4.1111
.epubOpen eBook File3.5 stars3.6451
.ibooksMulti-Touch iBook3.5 stars3.625
.mobiMobipocket eBook4 stars4.0182
.acsmAdobe Content Server Message File3.5 stars3.3636
.azw1Amazon Topaz eBook2.5 stars2.5
.azw3Amazon KF8 eBook File4 stars3.7895
.azw4Amazon Print Replica eBook4 stars3.75
.fb2FictionBook 2.0 File4 stars3.8687
.liteBook File3.5 stars3.7
.lrfSony Portable Reader File4 stars3.8
.prcMobipocket eBook File4 stars3.7826
.tpzKindle Topaz eBook File4 stars4
.apnxAmazon Page Number Index File4 stars4
.bkkBookBuddi eBook File3 stars3
.cebApabi eBook File3 stars3.1667
.dnlDNAML eBook File3.5 stars3.5
.ebkeBook Pro eBook File4 stars4.2
.etdAdobe Reader EBX Transfer Data File3 stars3
.fkbFlipkart eBook File1.5 stars1.6667
.htmlzZipped HTML eBook2.5 stars2.5
.lrsLibrie Reader Source File4 stars4
.lrxSony Portable Reader File3 stars3
.martMartView eBook File3 stars3
.mbpMobipocket Notes File3.5 stars3.3333
.ncxEPUB Navigation Control XML File4 stars4
.opfOpen Packaging Format File3.5 stars3.4444
.phlKindle Popular Highlights File3.5 stars3.5
.rzbRed Zion Book File3 stars3
.rzsRed Zion Security File3 stars3
.tcrPsion Series 3 eBook File3 stars3
.tk3TK3 Multimedia eBook3 stars3
.tr3TomeRaider eBook File3 stars3
.vbkVitalSource eBook3 stars3
.ybkYanCEyWare eBook3 stars3
.aepActiv E-Book Project4 stars4
.bpnuebPNU eBook File2 stars2
.cbcComic Book Collection3.5 stars3.5
.eaKindle End Actions File2 stars2
.ealKindle End Actions File2 stars2
.ednAdobe eBook Activation File2 stars2
.html0Book Designer File3.5 stars3.5
.htxtHanvon eBook File2 stars2
.htz5HyperMaker 5 Publication2 stars2
.nvaNVA Document4 stars4
.oebOpen eBook File2 stars2
.oebzipZipped Open eBook File2 stars2
.pefPEF Braille Book File2 stars2
.pmlPalm Markup Language File1.5 stars1.5
.pmlzZipped Palm Markup Language File2 stars2
.pobiKindle Touch Periodical File2 stars2
.qmkYanCEyDesktop Quickmarks File 2 stars2
.trTomeRaider 2 eBook File2.5 stars2.6667
.webzWEBZ Compressed eBook File3.5 stars3.5
.avaAvaaBook eBook1 star1
.htz4HyperMaker 4 Publication3 stars3
.koobKoob E-Book File1 star1
.snbShanda Bambook eBook1.5 stars1.6667