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.

We all have run into a situation where we need a document in PDF format but we often have that file as an image in JPG format or as a document in word format. Sharing files in PDF format is ...

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 ...