AVI vs WebM: Which Should You Use?

Side-by-side comparison of AVI and WebM video formats — features, pros, cons, and conversion options.

Quick Answer

AVI is best for Legacy video storage and Windows compatibility. WebM is best for Web video embedding and HTML5 playback.

Quick Verdict

AVI Best for Legacy video storage and Windows compatibility

✓ Wide compatibility
✓ Simple container format
✓ Good for editing
✗ Large file size

Convert AVI to WebM →

WebM Best for Web video embedding and HTML5 playback

✓ Royalty-free
✓ Web-optimized
✓ Good compression
✗ Limited hardware support

Convert WebM to AVI →

Specs Comparison

Side-by-side technical comparison of AVI and WebM

Feature	AVI	WebM
Category	Video	Video
Year Introduced	1992	2010
MIME Type	video/x-msvideo	video/webm
Extensions	.avi	.webm
Container	✓	✓
Codecs	DivX,Xvid,MJPEG,H.264	VP8,VP9,AV1,Vorbis,Opus
Max Resolution	4K	8K
Streaming	✗	✓
Subtitle Support	✗	✓

Pros & Cons

AVI

Pros

✓ Wide compatibility
✓ Simple container format
✓ Good for editing

Cons

✗ Large file size
✗ Limited modern codec support
✗ No native streaming

WebM

Pros

✓ Royalty-free
✓ Web-optimized
✓ Good compression

Cons

✗ Limited hardware support
✗ Not supported on all mobile devices
✗ Fewer editing tools

When to Use Each

Choose AVI when...

You need files optimized for Legacy video storage and Windows compatibility
Wide compatibility
Simple container format

Choose WebM when...

You need files optimized for Web video embedding and HTML5 playback
Royalty-free
Web-optimized

How to Convert

Convert between AVI and WebM for free on ChangeThisFile

Convert AVI to WebM Server-side conversion — auto-deleted after processing Convert WebM to AVI Server-side conversion — auto-deleted after processing

Frequently Asked Questions

What's the difference between AVI and WebM?

AVI is best for Legacy video storage and Windows compatibility, while WebM is best for Web video embedding and HTML5 playback. Both are video formats but they differ in compression, compatibility, and intended use cases.

Is AVI or WebM better for video?

It depends on your use case. AVI is better for Legacy video storage and Windows compatibility. WebM is better for Web video embedding and HTML5 playback. Consider your specific requirements when choosing between them.

How do I convert AVI to WebM?

Go to the AVI to WebM converter on ChangeThisFile. Upload your file and the conversion processes on the server, then auto-deletes. It's free with no signup required.

Can I convert WebM to AVI?

Yes. ChangeThisFile supports WebM to AVI conversion. Upload your file for server-side conversion — files are auto-deleted after processing.

Which is smaller, AVI or WebM?

File size varies depending on the content, compression method, and quality settings of each format. In general, lossy formats produce smaller files than lossless ones. Test with your specific files to compare actual sizes.

Does AVI support streaming?

No, AVI does not support streaming, whereas WebM does. This may be an important factor depending on your use case.

Is AVI or WebM free to use?

Both AVI and WebM are supported file formats that are free to use. You can convert between them for free on ChangeThisFile — server-side conversions are free with no signup required.

Which format is newer, AVI or WebM?

WebM is newer — it was introduced in 2010, while AVI dates back to 1992. Newer formats often offer better compression and features, but older formats tend to have wider compatibility.