MP4 vs WebM: which video format should you use?

Every video you've ever seen is probably one of these two containers. Understanding the difference saves bandwidth, storage, and headaches.

MP4 (H.264/AAC)

MP4 with H.264 video and AAC audio is the universal standard. Every phone, camera, browser, and social platform plays it. Its only real cost: the codecs carry patent licensing, and the format is less efficient than newer rivals.

WebM (VP9/AV1)

WebM is the open, royalty-free container championed by Google. VP9 gives roughly 30–50% better compression than H.264 at the same quality, and AV1 goes further still. The catch: not every device and editor supports it, and encoding AV1 is slow.

Which should you choose?

• Uploading to YouTube/IG/TikTok — MP4. Platforms re-encode anyway and MP4 is universally accepted.
• Embedding on your own website — WebM (VP9) for modern browsers, or offer both via <video> sources.
• Sending to friends — MP4. WhatsApp, Telegram and email clients all trust it.
• Long-term archiving — MP4 at high CRF, or a lossless format.

Quick conversion

Use our Video Compressor to convert MP4 ↔ WebM in seconds — set the output format and you're done. Everything runs in your browser, so your footage never leaves your device.