Optimize WebM for the web

Web-first video format that often compresses well and is common for modern browsers.

Last updated: 2026-03-18

To optimize WebM videos, run npx optimo video.webm. Optimo applies format-specific FFmpeg-powered compression that typically reduces WebM file size by 15–40% without visible quality loss. The original file is kept if the output is not smaller.

Command

Start here. Run optimo on a video file:

npx optimo video.webm

Tip: add --dry-run to preview changes.

When to use WebM

  • web delivery
  • background videos
  • high compression

Trade-offs

  • Some platforms prefer MP4 for maximum compatibility

Related formats

MP4
The most compatible web video container; a safe default for delivery.
MOV
Common container from cameras and editing tools; typically converted for the web.
MKV
Flexible container used in many workflows; commonly remuxed/converted for delivery.
AVI
Legacy container format; usually worth converting to MP4/WebM.
OGV
Ogg video container; occasionally used for open formats, but uncommon today.

Related conversions

Convert GIF to WebMConvert MP4 to WebMConvert MOV to WebMConvert MKV to WebMConvert AVI to WebMConvert WebM to MP4Convert WebM to MOVConvert WebM to MKV

More for WebM

Compress WebMResize WebMWhat is WebM?

Compare formats

If you're picking a delivery format, comparisons can help.

MP4 vs WebM

Frequently asked questions

How do I optimize WebM files?
Run "npx optimo video.webm" in your terminal. Optimo applies format-specific FFmpeg-powered compression that reduces WebM file size while preserving quality. The original file is kept if the optimized output is not smaller.
Is WebM optimization lossless?
By default, optimo uses lossless optimization for WebM. For additional compression, add the --lossy flag to allow minor quality trade-offs for significantly smaller files.
What tools does optimo use for WebM?
Optimo uses FFmpeg under the hood with format-specific settings tuned for WebM files.