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, ...

Kindle devices appeal to many people. When everything works, they're great. But Amazon is becoming more and more finicky, both in terms of supported formats and the freedom to manage your own books.

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 ...