✳ SOURCE AGGREGATED · COMPARISON-V2.0 · 8 COMPARISONS
MP4 vs WebM - which container to upload?
MP4 is the safe default - every creator platform accepts it. WebM is supported by TikTok (with VP9) and is the web-native container. Choose MP4 unless you have a verified WebM pipeline.
What differs
| Criterion | MP4 | WebM | Verdict | Origin |
|---|---|---|---|---|
| Platform support | Universal. | TikTok (VP9 path), YouTube, limited others. | prefer-a | sourced / sourced |
| Browser playback | Universal. | Chrome / Firefox / Edge; Safari limited. | prefer-a | sourced / sourced |
| File size at equivalent quality | Baseline. | ~30% smaller with VP9. | prefer-b | guidance / measured |
Decision table
| Goal | Recommendation | Reasoning |
|---|---|---|
| Multi-platform creator publishing | prefer-a | MP4 is universal. |
| Web-native delivery + YouTube | depends | WebM is smaller on web-native platforms. |
Recommendation
Choose MP4 unless you have a verified WebM pipeline and a web-native target.
Measured vs sourced
Cells marked measured are Koldflux Media Lab measurements. Cells marked sourced derive from each platform / codec standards body. Cells marked guidance are expert guidance, not measured.
Sources
Verified at 2026-09-19.
Lead path
Inspect my file: /tools/validate
Convert / make correct version: /tools/convert
Create all target versions: /tools/pack