Convert AVI to WebM Online
Free, private AVI to WebM converter. Your files never leave your browser. All processing happens locally on your device.
Drag & drop files here
images, PDFs, documents, audio, video, and more
No Server Uploads
FormatShift converts files directly in your browser. Your files never leave your device, so there's nothing to intercept or leak.
Instant Export
Files convert on your machine, so downloads are ready right away, even on slow connections.
High Fidelity
Good encoding keeps your files looking and sounding right, even at smaller sizes.
Built for Privacy
Your files are processed entirely in your browser. They never leave your device.
How to convert AVI to WebM
Drop your AVI file
Drag your file onto the converter above, or click to browse your files. Your files stay on your device.
Automatic conversion
FormatShift converts your file right in your browser using WebAssembly. No server involved, so your data stays completely private.
Download your WebM file
Once the conversion finishes, click the download button and you are done. The converted file is ready to use.
Why convert AVI to WebM?
AVI and WebM serve different purposes. Converting between them lets you use whichever format works best for your situation.
What is a AVI file?
Audio Video Interleave: AVI is an older video format from Microsoft. It has been around since 1992 and you may encounter it on older recordings or legacy systems. Modern formats like MP4 have mostly replaced it.
Created by: Microsoft, first released in 1992
Used for: Legacy video files, older Windows applications, archival footage
Technical details: Container format supporting various codecs. Lacks native support for modern codecs like H.265. Files tend to be larger than equivalent MP4.
Compatibility: Plays on Windows natively. Most media players handle AVI, but web browsers generally don't.
What is a WebM file?
WebM Video: WebM is Google's open video format designed for the web. It tends to produce smaller files than MP4 while keeping comparable quality, though compatibility outside of web browsers is more limited.
Created by: Google, first released in 2010
Used for: Web video, HTML5 video elements, web applications
Technical details: Container format using VP8/VP9 video and Vorbis/Opus audio. Open and royalty-free. Good compression efficiency.
Compatibility: Supported by all major browsers (Chrome, Firefox, Edge, Safari). Desktop media players like VLC handle it. Some mobile apps and editors may not.
AVI vs WebM
| Feature | AVI | WebM |
|---|---|---|
| Type | Audio Video Interleave | WebM Video |
| Best for | Legacy video files, older Windows applications, archival footage | Web video, HTML5 video elements, web applications |
| Compatibility | Plays on Windows natively. Most media players handle AVI, but web browsers generally don't. | Supported by all major browsers (Chrome, Firefox, Edge, Safari). Desktop media players like VLC handle it. Some mobile apps and editors may not. |
| Pros | Simple format, wide player support, good for legacy compatibility | Smaller files than MP4, open and royalty-free, excellent browser support |
| Cons | Large file sizes, outdated codec support, no native browser playback | Less compatible than MP4 outside of browsers, limited editing tool support |