AVI to WebM Converter

Turn a heavy legacy AVI into a light WebM for the web, free and right in your browser, with no signup and no watermark.

Select AVI file →

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We support most file types including: MP4, MOV, WEBM, AVI, MP3, WAV, PNG, JPEG, GIF, MKV, PDF, FLAC, TIFF!

EchoWave is used by creators, marketers, educators, and businesses to convert and edit media online.

Updated June 2026

AVI is a legacy Microsoft container with older codecs like DivX or Xvid, while WebM is the open format built for the web, using VP8 or VP9 video with Vorbis or Opus audio. Converting AVI to WebM usually shrinks the file a lot at the same quality and gives you a clip that plays inline in Chrome, Firefox, Edge, and modern Safari with no plugin. EchoWave does it in your browser, free and with no signup.

Free, no sign-upNo account, no trial

Runs in your browserNothing to install

Works on every devicePhone, tablet, laptop

No watermarkClean output, every time

How it works

How to convert AVI to WebM

1
Upload your AVI
Drag your AVI onto the converter or pick it from your device. Nothing to install.
2
Choose WebM and convert
Select WebM as the output and start. Free, with no sign-up and no watermark.
3
Download your WebM
Save the finished WebM, or open it in the editor to trim, crop, or resize it first.

Try it

Estimate your WebM

Pick a video bitrate and a length to see the WebM file size before you convert.

Video bitrate

Length5 min

1 min30 min

Estimated WebM size183MBSharp 1080p

An estimate. Real size varies with resolution, frame rate, and how much the picture moves.

The formats

AVI vs WebM

AVI

Audio Video Interleave

A legacy Microsoft video container

Type: Legacy video container
Holds: Older codecs like DivX or Xvid with MP3 or PCM audio
Typical size: Large for the quality it gives
Plays on: Windows and VLC, patchy on phones

Best for:Playing older Windows video files

WebM

Open video built for the web

Type: Open web video container
Holds: VP8 or VP9 video with Vorbis or Opus audio
Typical size: Small at good quality
Plays on: Chrome, Firefox, Edge, and Android

Best for:Video embedded on web pages

Will it lose quality?

When the codecs already match WebM, the converter can change the container without re-encoding, so the picture stays identical.
When the video has to be re-encoded for WebM, a high bitrate keeps it visually close to the AVI.
Converting cannot add detail the AVI never had. The output is at best as good as the source.

Use cases

What people use it for

Play anywhereMake a clip your device supports

Video editorsGet footage your software accepts

Web videoUse a format browsers play

CourseworkHand in a standard video file

SharingSend a clip people can open

Troubleshooting

If something looks off

The WebM will not play

Some players are picky about codecs. Try it in VLC, which opens almost anything, or convert again and let the converter re-encode the video.

The file got larger

A format change can shift the size, and re-encoding at a high bitrate adds overhead. Lower the bitrate or trim the clip for a smaller file.

Audio and video drift out of sync

Re-download the source and convert again. If a long recording drifts, splitting it into shorter pieces usually fixes the sync.

FAQ

AVI to WebM questions

Why convert AVI to WebM?

AVI is a legacy container that is large for its quality and patchy on the modern web, while WebM is built for HTML5 video and compresses far better. Converting gives you a smaller file that embeds cleanly in a web page and plays inline in current browsers without any plugin.

Will the WebM be smaller than the AVI?

Usually by a wide margin. AVI often uses older DivX or Xvid codecs that are inefficient by today's standards, while WebM's VP9 packs the same picture into far less space. The exact saving depends on the source and the bitrate you choose, which you can preview in the size estimator on this page.

Does converting AVI to WebM reduce quality?

The picture is re-encoded into VP8 or VP9, so the WebM can only be as good as the source AVI, never sharper. A reasonable bitrate keeps it visually close to the original while still ending up much smaller, since modern codecs are more efficient than AVI's.

Which browsers play WebM?

WebM plays natively in Chrome, Firefox, Edge, and Opera, and in Safari 14.1 and later. That broad browser support is the main reason to choose WebM for video you embed on a site. On the desktop, VLC also opens it without any extra setup.

Is the AVI to WebM converter free?

Yes. EchoWave converts AVI to WebM with no signup, no account to create, no trial, and no watermark. Upload your AVI, convert it, and download the WebM from your browser.

How do I convert AVI to WebM?

Upload your AVI, choose WebM as the output format, and start the conversion. When it finishes, download the WebM, or open the clip in the editor first to trim, crop, or resize it.

Does the AVI to WebM converter work on iPhone, Android, Mac, and Windows?

Yes. The converter runs in any browser, so you can convert AVI to WebM on iPhone, iPad, Android, macOS, Windows, Chromebook, and Linux with nothing to install.

Should I use WebM or MP4 for my site?

Both are good web formats. WebM is open and often slightly smaller, while MP4 has the widest reach across older devices and apps. Many sites serve WebM with an MP4 fallback, and you can convert your AVI to either here.