WebM vs MP4
Google's royalty-free web format vs the universal standard — which video format should you embed on your website?
Feature-by-Feature Comparison
Compression
WebM
Lossy (VP8, VP9, AV1)
MP4
Lossy (H.264, H.265)
Typical File Size
WebM
Small to Medium
MP4
Small to Medium
Video Quality
WebM
Good to Excellent
MP4
Good to Excellent
Chrome / Firefox / Edge
WebM
Yes
MP4
Yes
iOS / Safari Support
WebM
Limited
MP4
Yes
BetterLicensing
WebM
Royalty-free, open-source
BetterMP4
Patent licensing required
Best Use Case
WebM
Open-source web projects
MP4
Universal web distribution
When to Use WebM
- HTML5 web video where iOS support is not required
- Open-source projects that need royalty-free media
- Web games and interactive media on desktop or Android
- Providing an alternative format alongside MP4 in video elements
- Google-centric platforms and YouTube integration
When to Use MP4
- Maximum cross-device video compatibility including iOS and Safari
- Any video that needs to play on all browsers and devices
- Social media uploads and streaming platforms
- Mobile video content for iOS users
- Default choice when targeting the broadest possible audience
The Verdict
For maximum compatibility, MP4 is the clear winner — it works on iOS, Safari, Android, and all browsers. WebM's advantage is being royalty-free and open. The best practice is to provide both: serve WebM to modern non-Apple browsers and MP4 as the universal fallback using the HTML5 video element's source tags.
Frequently Asked Questions
Common questions about WebM and MP4
Why use WebM at all if MP4 is more compatible?
WebM uses royalty-free codecs (VP8, VP9, AV1) which carry no patent licensing fees. For companies building large-scale video platforms, this reduces legal and financial complexity. WebM with AV1 also delivers excellent compression efficiency.
Does iOS support WebM in 2026?
Safari on iOS still does not natively support WebM. While some iOS browsers with their own rendering engines may support it, you cannot rely on WebM for iOS users without an MP4 fallback.
Is WebM's VP9 compression better than MP4's H.264?
VP9 and H.265 are comparable in efficiency and both significantly better than H.264. WebM with AV1 can outperform both. However, H.264 MP4 remains the most practical choice for universal delivery.
How do I serve both WebM and MP4 on my website?
Use the HTML5 video element with multiple source tags. Browsers will pick the first format they support. List WebM first for modern browsers, MP4 as the fallback.
Can I convert MP4 to WebM?
Yes. Our free online converter can convert MP4 to WebM in your browser. This is useful when you need a royalty-free WebM version of existing MP4 video content for web projects.
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