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AVI
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WEBM

AVI to WebM Converter — Free, Online, No Upload

Old AVI files are dead weight on the modern web — WebM brings them back to life in any browser.

Free · no signup2 free files a day100% in-browser · no upload

Tap to select AVI files

or click to browse

2 free files per day (2 left today) · Up to 10 MB each · Upgrade for more

✓ Files never uploaded✓ 100% browser-based✓ No account required
Need the reverse?WEBM → AVI

How to convert AVI to WEBM online

  1. 1

    Drop your AVI file

    Drag your Audio Video Interleave file onto the box above, or click it to pick a file.

  2. 2

    Wait a few seconds

    Conversion starts on its own and runs on your device, not on a server.

  3. 3

    Download your WEBM

    Click Download to save the WebM Video Format file.

AVI vs WEBM: format overview

AVI

Audio Video Interleave

Microsoft · 1992

Compression
lossy
Transparency
No
  • ✓ Universal Windows compatibility
  • ✓ Simple container format — widely supported
  • ✗ Large file sizes (minimal compression)
WEBM

WebM Video Format

Google (On2 Technologies) · 2010

Compression
lossy
Transparency
No
  • ✓ Royalty-free codec (VP8/VP9/AV1)
  • ✓ Excellent web streaming support

AVI magic bytes: 52 49 46 46 xx xx xx xx 41 56 49 20

WEBM magic bytes: 1A 45 DF A3

Why convert AVI to WEBM?

AVI files have no place in a modern web workflow. Browsers cannot play AVI using the HTML5 video element — Chrome, Firefox, Safari, and Edge all require a different format for native video embedding. Old footage, archived recordings, and digitized video in AVI format must be converted before it can be served on a website, embedded in a web app, or shared via a web player.

WebM is the open web video standard designed for HTML5. Chrome, Firefox, and Edge play it natively with no plugins. It holds VP8, VP9 or AV1 video; this converter writes VP8, which is newer than the DivX or Xvid codecs common in old AVI files. Because it is royalty-free, there are no licensing complications for web distribution.

Converting AVI to WebM transcodes the video to VP8 and the audio to Opus, producing a file that embeds directly in an HTML5 video element. This is a full re-encode with fixed settings: the video is capped at about 2 Mbps, which keeps standard- and HD-ready footage clean. Note that Safari support for WebM, while improving, is not complete — provide an MP4 fallback if full browser coverage is required.

Quality & file size: AVI to WEBM

Typical sizes (1 minute 1080p): AVI 200–600 MB → WEBM 50–200 MB.

Frequently asked questions

Is WebM a good format for videos converted from AVI?
For web pages, yes — it plays in all modern browsers without plugins. This converter writes VP8 video with Opus audio, capped near 2 Mbps; compared with an old Xvid AVI the size can go either way.
What happens to the audio when converting AVI to WebM?
The AVI's audio (typically MP3 or PCM) is re-encoded to Opus, which is WebM's native audio codec. The output is a single self-contained WebM file with both video and audio.

Your AVI file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works