What kind of files can be send to Kindle

Images that are of type JPEGs (.jpg), GIFs (.gif), Bitmaps (.bmp), and PNG images (.png).
Adobe PDF (.pdf) documents are delivered without conversion to Kindle DX, Second Generation and Latest Generation Kindles.

Adobe PDF (.pdf) can be converted to Kindle format and delivered on an experimental basis.

If the document that failed belonged to one of the above document types, please ensure the document is not password protected or encrypted. Note that the Latest Generation Kindles support password protected PDFs.

Helpful tips for personal document attachments:

• The file size of each attached personal document should be less than 50MB (before compression in a ZIP file)
• The email submitted should not contain more than 25 attached personal documents

You can learn more about transferring personal documents to your Kindle in our help pages:
http://www.amazon.com/kindlepersonaldocuments/

If you would like immediate assistance, please contact customer support at +1-866-321-8851 (US customers) or +1-206-266-0927 (International Customers).

Sincerely,
Amazon Kindle Support


Learn more about Amazon Kindle
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If you have further questions about Kindle, please visit the Amazon Kindle Help pages
The Help pages will provide you with answers to common questions and provide you with a direct link to Amazon Kindle specialists.
To contact Amazon Kindle Customer Service, simply click a button in the Contact Us box on the Help pages to receive assistance by e-mail or phone.