Are you able to download already existing AVI onto Kindle Fire HD to watch them?

From the Amazon Kindle Fire product page these are the Content Formats the Kindle Fire HD supports:
Kindle (AZW), KF8, TXT, PDF, unprotected MOBI, PRC natively, Audible Enhanced format (AAX), DOC, DOCX, JPEG, GIF, PNG, BMP, non-DRM AAC, MP3, MIDI, PCM/WAVE, OGG, WAV, MP4, AAC LC/LTP, HE-AACv1, HE-AACv2, AMR-NB, AMR-WB, HTML5, CSS3, MP4, 3GP, VP8(.webm)

If you have any problems when enjoying videos on Kindle Fire HD 7"/8.9", pls refer to

Know Your Kindle - Apps, Tools, Tutorials for Viewing Movies on Kindle Fire HD

Anything you have not in one of these formats will need to be converted. With the new Kindle Fire HD are you able to download already existing AVI onto the device to watch them? The answer is “NO”. As neither Amazon nor its subsidiaries provide any content in .avi format that may be the reason it's not supported. If that is the case, Kindle Fire HD owners need to render AVI movies to MP4 for smooth playback on their Amazon tablets. MP4 is quite good, and you will find a lot of HD movies display beautifully in this format. It is beyond simple to download Pavtube Video Converter to quickly and easily convert AVI to MP4 for your Kindle Fire HD device. Here comes a step-by-step instruction.

Required software:
Pavtube Video Converter (here in this article we simply run it as an AVI to MP4 converter for Kindle Fire HD).

How to render AVI movies to MP4 for Kindle Fire HD?

1. Add DivX/Xvid AVI movies for AVI to Kindle Fire HD conversion
Launch Pavtube Video Converter as the best HD AVI to Kindle Fire HD Converter, and click “Add video” or “Add from folder” button to load your source files in .avi format. As a versatile HD video to Kindle Fire HD Converter, you can also import 1080p MKV files and other HD media into Pavtube software to do format conversion.

2. Select MP4 as output format for Amazon Kindle Fire HD
Pavtube Video Converter features optimal H.264 MP4 format for Amazon Kindle Fire HD. To choose a proper format for Kindle Fire HD, you can follow:
“Format menu” > “Android” > “Amazon Kindle Fire HD H.264 (*.mp4)”

Notes:
If you can not find the “Amazon Kindle Fire HD H.264 (*.mp4)” profile in the current version of Pavtube Video Converter you are using, you can download a profile patch here.

3. Custom image and sound quality for Kindle Fire HD (optional)
You can click “Settings” button and go to “Profile Settings” panel to adjust video and audio parameters. By default, the “Amazon Kindle Fire HD H.264 (*.mp4)” profile uses the following video and audio settings:
Video Encoder: H.264, Audio Encoder: AAC
Resolution: 1280*800, Video Bitrate: 1500 kbps, Frame Rate: Original
Audio Sample Rate: 44100 hz, Audio bit rate: 128000 bps, Audio Channels: Stereo

If you prefer to create 1080p videos for Kindle Fire HD 8.9”, you can reset video resolution to 1920*1080 to get 1080p quality; if you would like togenerate 720p videos for Kindle Fire HD 7’, you can reset video resolution to 1280*720 to acquire 720p quality.

4. Convert AVI files to Amazon Kindle Fire HD optimized H.264 MP4
Click “Convert” button to start rendering AVI video to Kindle Fire HD preferred MP4 video. If you don’t’ want to wait around for the entire conversion process, you can tick off the checkbox before “Shut down computer after conversion”. When conversion completes you can click “Open” button to get the generated files and transfer these MP4 videos to Your Kindle Fire HD via USB connection.

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