Kobo scores over competition in supporting the maximum types of file formats. Kobo supports EPUB, PDF, JPEG, GIF, PNG, BMP, TIFF, TXT, HTML, RTF, MOBI, CBZ, and CBR formats. In contrast, Sony supports only EPUB, PDF, BBeB Book, TXT, and RTF, and Nook supports only EPUB, PDF, PDB, JPEG, PNG, and BMP. Kindle 3 supports a different set of AZW, AZW1, TXT, MOBI, PRC, AA, AAX, PDF files and, unlike other e-book readers, does not allow importuning books from other open-standard bookstores. To compensate, Kindle offers file-conversion support that converts some type of files to make it readable on Kindle.
All offer free book preview. All except Kindle offer access to the public library (EPUB extensions) and allow borrowing library books. Nook even allows sharing and lending books to others.The advantage of Kindle and Nook is the support offered by Amazon and Barnes & Nobles respectively. Visiting the local Barnes & Nobles, for instance, allows the Nook to download the latest book news, freeebook and reviews, and much more. Barnes & Nobles also offers the unmatched facility of reading any Barnes & Nobles e-book for an hour a day. Amazon, being the world’s largest online bookseller offers more e-Books than anyone else does. Nook and Sony, not brought out by booksellers, do not offer such support.