Convert WEBM to AVI online

To convert WEBM to AVI, upload the WEBM file, start the conversion and download the result: Converter.now writes an AVI with Xvid (MPEG-4 Part 2) video and MP3 audio. The first video and audio tracks are re-encoded; extra audio tracks and embedded subtitles are not copied. Both formats are lossy, so this adds a second round of compression; convert from the best original you have rather than an earlier export.

Choose Files or drop a video file here Preview it before choosing the output settings

Max file size 1 GB. Sign in to save your results.

By proceeding, you agree to our Terms of Use.

◈ Encrypted transfer◷ Short retention⊘ No watermark◎ Works on every device

WEBM to AVI at a glance

Converts: WebM video → AVI video container
Output: An AVI with Xvid (MPEG-4 Part 2) video and MP3 audio
Compression: WEBM: lossy → AVI: lossy
Engine: FFmpeg
Privacy: Private download link; files are deleted after 6 hours. No account needed.

How WEBM turns into AVI: Timed-stream transcoding

The picture, sound, and timing streams inside WEBM is decoded first, then re-encoded into AVI's own codec and container profile. Duration typically holds steady even as compression, channel mapping, frame cadence, or auxiliary streams shift underneath it. WebM parsing follows Matroska-derived clusters and cues while enforcing web-oriented VP8/VP9/AV1 picture and Vorbis/Opus audio expectations. AVI output interleaves indexed audio and video chunks in a legacy RIFF container whose subtitle, modern metadata, and variable-frame-rate behavior is limited.

Decoded media - An open web container written here with VP9 video and Opus audio when available. Encoded delivery profile - An older Microsoft media container commonly paired here with Xvid video and MP3 audio.

For related jobs, compare other WEBM converters with the full list of AVI conversions.

Before converting a whole batch, read choosing between H.264, VP9 and AV1; it explains how to balance reach, quality and file weight.

WEBM

WebM video

Used for open web video delivery.

Family: Video
MIME: video/webm

→

AVI

AVI video container

Designed for recorded motion video with an accompanying soundtrack.

Family: Video
MIME: video/x-msvideo

Reading WEBM correctly and satisfying what AVI expects

What can fail when WebM video is interpreted

Encoding can be slower and older Apple or editing software may not support WebM reliably.

What AVI video container cannot safely promise

AVI has limited support for modern metadata, captions, variable frame rates, and some web players.

How the AVI writer handles this route

The verified AVI profile uses Xvid video and MP3 audio for compatibility with older AVI workflows.

Acceptance evidence for the converted AVI

Record the WEBM evidence before conversion

Test browser playback, seeking, VP9/Opus support, dimensions, and audio sync.

Test the AVI file in its receiving workflow

Test seeking and audio sync in the target player, not only the opening frame.

The delivery decision for this WEBM to AVI route

Switch to AVI only once the destination player, editor, or service has confirmed support for its exact container and codecs. If extra tracks or the original encoding must survive, WEBM remains the safer choice.

What changes between the WEBM model and the AVI deliverable

The first video and audio tracks are re-encoded; extra audio tracks and embedded subtitles are not copied.
Both formats are lossy, so this adds a second round of compression; convert from the best original you have rather than an earlier export.
WEBM and AVI use different metadata conventions, so application-specific fields should be treated as optional until verified.