MOV to WebM

The path from iPhone footage to a self-hosted web video. VP9 is slower to encode than H.264 but typically 30 percent smaller at matched quality.

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
Alpha channel

Lost

Chapters
Multiple tracks

Settings used

VP9 at CRF 32 with constant quality, audio to Opus. Encoding takes noticeably longer.

When not to convert

Not for a file someone needs to open in a desktop player. Convert to MP4 instead.

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 MOV to WebM lose anything?

Yes. Chapters, Multiple tracks cannot be carried into WebM and are dropped. The path from iPhone footage to a self-hosted web video. VP9 is slower to encode than H.264 but typically 30 percent smaller at matched quality.

Are my files uploaded when I convert MOV 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 MOV to WebM?

VP9 at CRF 32 with constant quality, audio to Opus. Encoding takes noticeably longer.

When should I not convert MOV to WebM?

Not for a file someone needs to open in a desktop player. Convert to MP4 instead.