AVI to WebM

Old footage to modern web video in one step. The size drop is the largest of any video pair here because the source codec is decades behind VP9.

Runs in your browser // nothing is uploaded

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What survives the conversion

Derived from what each format is able to store, not from what the conversion promises.

Kept

Audio track
Metadata, which AVI could not store
Alpha channel, which AVI could not store

Lost

Nothing AVI carries is dropped by WebM.

Settings used

VP9 at CRF 32 with constant quality, audio to Opus. Expect a long encode for old high-bitrate AVI.

When not to convert

Not if the video needs to play outside a browser. MP4 is the safer target.

About these formats

Video

What is a WebM file?

WebM is a royalty-free video container introduced by Google in 2010, normally carrying VP8, VP9 or AV1 video with Vorbis or Opus audio. At the same visual quality it is usually smaller than an H.264 MP4, and it supports true alpha transparency, which MP4 in practice does not.

Read the format guide

Common questions

Does converting AVI to WebM lose anything?

Nothing this conversion can preserve is dropped. Old footage to modern web video in one step. The size drop is the largest of any video pair here because the source codec is decades behind VP9.

Are my files uploaded when I convert AVI to WebM?

No. The conversion runs in your browser tab, so the file is never transmitted and the page works offline once loaded.

What settings does Filoven use for AVI to WebM?

VP9 at CRF 32 with constant quality, audio to Opus. Expect a long encode for old high-bitrate AVI.

When should I not convert AVI to WebM?

Not if the video needs to play outside a browser. MP4 is the safer target.