How do I convert WebM to AVI?

Upload your WebM file using the box above, confirm AVI as the output format, then select Convert. The converted file is ready to download as soon as processing finishes — usually in a few seconds.

Is converting WEBM to AVI free?

Yes, and there is nothing to sign up for. Every conversion route is free on every plan — paying raises limits such as file size and how many conversions you get, and removes advertising. It never unlocks a format, adds a watermark or degrades the output.

Will the quality change when converting to AVI?

AVI uses lossy compression, so some data is discarded to keep the file small. The default quality setting is tuned to be visually or audibly transparent for most material, and you can raise it in the conversion settings.

What happens to my file afterwards?

The uploaded file is deleted as soon as the conversion completes, and the converted file is removed automatically once its retention window ends. Download links are signed and expire within minutes.

webmavi

Convert WebM to AVI

Free online converter for WebM files. Legacy container with broad desktop support. Nothing to install, no watermark, and every file is deleted automatically.

Drag and drop your files

Upload a WebM file to convert it to AVI. Up to 3 files at once, 100 MB each.

Free · up to 3 files · 100 MB each · files deleted automatically after 1 hour.

About WEBM and AVI

WebM .webm

An open container built for the web, holding VP8, VP9 or AV1 video with Vorbis or Opus audio. Royalty-free by design.

Good for

Open and royalty-free
Smaller than H.264 MP4 at similar quality
Supports transparency, which MP4 does not

Trade-offs

Weaker support in desktop editors and older devices
Slower to encode than H.264
Not the safe choice for sending a file to someone

video/webm

AVI .avi

A Microsoft container from 1992. Still readable everywhere, but it predates modern streaming, subtitles and variable bitrate audio.

Good for

Opens in very old software
Simple, well-understood structure

Trade-offs

Much larger than MP4 for the same quality
No native subtitle support
Poor handling of variable bitrate audio and modern codecs

video/x-msvideo

WEBM and AVI side by side

WebM compared with AVI
	WEBM	AVI
Compression	Lossy (VP9 or AV1)	Container — usually older codecs
Transparency	Yes — with VP9 or AV1	No
Typically used for	Web video, background loops with transparency	Legacy video files

What changes when you convert WEBM to AVI

WEBM and AVI are unrelated containers

WEBM is built on a deliberately narrow subset of Matroska. AVI is RIFF, Microsoft's chunk format from 1992. A container is a box, not a compression method: what decides how a video looks and how large it is, is the codec stored inside, and these two boxes accept different ones.

This is a re-encode, not a repackage

Some tools can move a stream into a different container untouched when the codecs happen to line up. We do not — every job here is decoded and encoded again, so the conversion takes time in proportion to the length of the file and costs a small amount of quality even where a repackage would have been possible. In exchange the output is predictable: it plays everywhere, rather than inheriting whatever the source happened to contain.

What your AVI will contain

The output is MPEG-4 Part 2 video with MP3 audio — the codecs AVI was built around, both roughly a generation behind what an MP4 would give you. The video is encoded at a constant quality target rather than a fixed bitrate, so the size of the result follows the complexity of the footage rather than being decided in advance.

AVI costs you size and quality

MPEG-4 Part 2 is roughly a generation behind H.264, so an AVI will usually be larger than an MP4 of the same clip at the same quality — not smaller. AVI also has no proper support for chapters, subtitles or modern metadata. Convert to it when a piece of old software or hardware will read nothing else, not for quality, size or convenience.