What's WebM?
WebM is a multimedia container format designed to provide a royalty-free, high-quality open video compression format for use with HTML5 video, a WebM file consists of VP8 video and Vorbis audio streams, in a container based on a profile of Matroska.
If you want to convert AVI to WebM, and do not know how to and which software is the best. AVS Video Converter is the best choice to convert AVI to WebM, follow the tutorial below, you just need some simple steps.
Tips: Please download the software, and then follow the wizard to complete the installation.
Step 1: Launch and add files
After launching the AVI to WebM Converter, click the "Browse..." to browse your computer to find the AVI files your want to convert.

Step 2: Output settings
The "To WebM" is not on the toolbar, you can choose it from the drop-down button after "To Blu-ray" button as output format. click the button circled to specify a destination folder.

Step 3: Start converting AVI to WebM
Hit the "Convert Now!" button on the right corner at the bottom of the main interface to start to convert AVI to WebM.
When AVI to WebM conversion is done. You can enjoy WebM videos in your PC, Android devices, or upload to Youtube now! Is it pretty simple? try the Video Converter to convert AVI to WebM immediately.
Related Links: Convert AVI to DPG, AVI to AMV Converter