The open-source EPUB e-book format is great for sharing books between different readers and making life easier on readers generally--but Amazon's Kindle, the big player, doesn't support it.

.PRC files are almost identical to the .AZW files that Amazon uses for Kindle books. This makes the Kindle capable of displaying .PRC files without having to convert them to another format. However, ...

PalmDoc Book (PDB) files are container files used to hold structured digital text files in a format that can include graphics with the text. Many older released texts are contained in the PDB format, ...

All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Mashable may earn an affiliate commission. Kindles used to only ...