MP4 en WebM

Convertissez vos vidéos MP4 en WebM. Créez des vidéos prêtes au HTML5 pour des diffusions web modernes.

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Fichier trop volumineux. La limite est de 100 Mo.

Supporté : .mp4 (Max 100 Mo)

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info À propos de cet outil
Créez des vidéos WebM de haute qualité idéales pour la balise video HTML5.

File size: WebM output is typically 30–40% smaller than the source MP4 at comparable visual quality using VP8 encoding.

Quality: VP8 (WebM) quality is comparable to H.264 at the same bitrate. Encoding introduces one generation of quality loss from the source MP4.

format_list_numbered Comment convertir
  • 1
    Importez une vidéo MP4.
  • 2
    Convertissez en WebM.
  • 3
    Téléchargez le fichier.
help FAQ

Which browsers support WebM?

Chrome, Firefox, and Edge all support WebM natively. Safari has limited support — for full browser coverage, provide both WebM and MP4 sources in your <video> tag.

How do I serve both MP4 and WebM for maximum compatibility?

Use the HTML5 <source> element: <video><source src='video.webm' type='video/webm'><source src='video.mp4' type='video/mp4'></video>. Browsers use the first format they support.

Does WebM support transparency (alpha channel)?

Yes — WebM with VP8/VP9 supports an alpha channel for transparent video, which MP4 does not. This is a key advantage for overlay graphics.

Is WebM better than MP4 for web?

WebM achieves better compression than H.264 MP4 and is royalty-free. VP9 (WebM) vs H.264 (MP4) compression is roughly equivalent to the WebP vs JPG comparison for images.
lightbulb Common use cases
  • check_circle Serving video in HTML5 <video> elements for open web standards
  • check_circle Reducing bandwidth costs with smaller web video files
  • check_circle Creating transparent video overlays (WebM supports alpha channel)
  • check_circle Self-hosting web video without codec licensing concerns
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