Convert AVI to WEBM online

To convert AVI to WEBM, upload the AVI file, start the conversion and download the result: Converter.now writes a WebM with VP9 video (CRF 32) and Opus audio at 160 kbps. 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

AVI to WEBM at a glance

Converts: AVI video container → WebM video
Output: A WebM with VP9 video (CRF 32) and Opus audio at 160 kbps
Compression: AVI: lossy → WEBM: lossy
Engine: FFmpeg
Privacy: Private download link; files are deleted after 6 hours. No account needed.

AVI to WEBM: The timed-stream transcoding route explained

Decoding AVI recovers the picture, sound, and timing streams it carries; writing WEBM means re-expressing that under a different codec and container profile. Duration commonly survives untouched even while compression, channel mapping, cadence, metadata, or auxiliary streams do not. AVI is reconstructed from RIFF indexes and interleaved chunks; codec tags, frame timing, keyframes, and audio alignment determine whether seeking remains stable. WebM output pairs web-oriented video and audio codecs with Matroska-derived timing and cues, prioritizing browser delivery over broad editing-suite interchange.

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

Need a different output? See all AVI conversion options, or check which other files convert to WEBM.

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

AVI

AVI video container

Used for recorded motion video with an accompanying soundtrack.

Family: Video
MIME: video/x-msvideo

→

WEBM

WebM video

Designed for open web video delivery.

Family: Video
MIME: video/webm

AVI source facts versus WEBM output requirements

What can fail when AVI video container is interpreted

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

What WebM video cannot safely promise

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

How the WEBM writer handles this route

The verified WebM profile uses VP9 video at CRF 32 and Opus audio at 160 kbit/s.

Acceptance evidence for the converted WEBM

Record the AVI evidence before conversion

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

Test the WEBM file in its receiving workflow

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

Deciding when AVI to WEBM is the right conversion

Confirm the receiving player, editor, or publishing service actually names WEBM's container and codecs before switching; stay with AVI if extra tracks or original encoding need to survive intact.

What changes between the AVI model and the WEBM 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.
Treat AVI-specific metadata fields as optional in the WEBM result until you have actually confirmed they survived.