FileChange

WEBM vs MP4

WEBM and MP4 are both designed for web video delivery, but they come from different worlds. WEBM is Google's open-source, royalty-free format using VP8/VP9 video codecs. MP4 typically uses H.264/H.265, which involves patent licensing (though this is invisible to end users). In practice, both formats deliver excellent quality and similar file sizes. The key difference is ecosystem support: MP4 plays on every device and platform, while WEBM is primarily a web browser format with limited native OS and device support. For website video, both work well. For anything beyond the browser, MP4 is the safer choice.

WEBM vs MP4 — Feature Comparison

Feature	WEBM	MP4
Browser Support	Chrome, Firefox, Edge	All browsers
Mobile Device Support	Android (partial)	Universal
Licensing	Royalty-free	Patent licensing (H.264)
File Size (VP9 vs H.264)	Similar or slightly smaller	Similar
Video Quality	Excellent	Excellent
Streaming	Supported	Industry standard
iOS Support	Safari only (partial)	Native
Video Editing	Limited support	Universal
YouTube (internal)	VP9 used internally	H.264 for delivery
Smart TVs	Rarely supported	Universal

When to use WEBM

Use WEBM when you specifically need a royalty-free format, when targeting web-only delivery in Chrome and Firefox, or when using open-source infrastructure that prefers VP9. WEBM is also the default output of many browser-based screen recorders and WebRTC applications.

When to use MP4

Use MP4 for all general video delivery. MP4 with H.264 is the most universally supported video format -- it plays on every device, browser, OS, and platform. For website video, use MP4 as the primary source with optional WEBM as an alternative source in the HTML video element.

Verdict: WEBM vs MP4

MP4 is the safer choice for nearly every use case due to universal device and platform support. WEBM is an excellent alternative for web-only delivery and open-source workflows. For maximum compatibility, provide both in your HTML video element.

WEBM vs MP4 — Frequently Asked Questions

Is WEBM better quality than MP4?

VP9 (WEBM) and H.264 (MP4) produce very similar quality at similar bitrates. Neither has a clear quality advantage. VP9 may be slightly more efficient at lower bitrates.

Why does my screen recorder save as WEBM?

Browser-based screen recorders use the MediaRecorder API, which defaults to WEBM/VP8 in Chrome and Firefox because VP8 is royalty-free and built into the browser.

Can I play WEBM on iPhone?

Safari on iOS 15+ has partial VP8 support. For reliable iOS playback, convert WEBM to MP4.

Should I offer both WEBM and MP4 on my website?

It is a good practice. The HTML video element supports multiple sources, so browsers pick the best format they support. This maximizes compatibility and potentially reduces file size.