The Kindle is very limited on the kinds of documents it is compatible with. Thankfully you can convert most file types for free.

• Microsoft Word (.DOC)
• Structured HTML (.HTML, .HTM)
• JPEG (.JPEG, .JPG)
• GIF (.GIF)
• NG (.PNG)
• BMP (.BMP)
• Compressed ZIP (.ZIP)

PDF, is not supported at all.

Send any of these file types to name@free.kindle.com to be converted. The converted document will be emailed to your computer at the email address associated with your Amazon.com account. You can then transfer the document to your Kindle using your USB connection.