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The fourth generation Kindle, Kindle Touch and Kindle Touch 3G are able to display Kindle (AZW), TXT, PDF, unprotected MOBI, and PRC files natively.
Amazon offers an email-based service that will convert JPEG, GIF, PNG and BMP graphics to AZW. Amazon will also convert HTML pages and Microsoft Word (DOC) documents through the same email-based mechanism, which will send a Kindle-formatted file to the device via 3G for $0.15 per MB or via WiFi for free. These services can be accessed by sending emails to "kindleusername"@kindle.com and to "kindleusername"@free.kindle.com for Whispernet-delivered and WiFi-delivered file conversion, respectively — and are available to true Kindle devices, Apple IOS devices running Kindle app version 2.9 or greater and not to other devices running the Kindle application (i.e., android, etc.).