Note: If you are using Mac OS X, please refer to how to convert AVI to iPad on Mac.
What is AVI?
AVI, which stands for Audio Video Interleave, is a Container format used by Microsoft's Video for Windows multimedia framework. Since it was developed for Windows 3.1 in 1992 it lacks some features found in newer containers like MPEG or MP4, but is still widely used by consumers and even supported by some standalone DVD players. Although still supported in Windows, and suitable for certain formats like DV, it's not a good general purpose container, and even Microsoft uses other containers for their own video formats.
from afterdawn.com
The Apple iPad can only play video and movie files in MP4, MOV or M4V format. If you want to transfer AVI files to your iPad for playback, you need to get a converter that will go from AVI to iPad video. The following guide will walk you through the steps to convert AVI to iPad MPEG-4 video for viewing on Apple iPad using AVI to iPad Converter.
Download and Install AVI to iPad Converter
Download the latest version of AVI to iPad Converter. Install and run it.
Download AVI to iPad Converter
Add AVI File
Click the "Add Video" button to import the AVI file. Alternatively, you can click "File -> Add Video Files..." to add the AVI file. You can also batch import AVI files by clicking "File -> Batch Add Video Files".
Choose MP4 as Output Format
From the "Profile" drop-down list, choose the Apple iPod/iPad category if you are going to convert AVI to iPad format for transferring to your iPad.
Note: You can also adjust the audio/video parameters to customize a specific profile that best fits your needs.
Start Converting AVI to iPad
Click the "Start Encode" button to start to convert AVI to iPad.
Wireless Transfer App
Wirelessly transfer photos & videos among iOS devices as well as between computer and device.
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