WebM to MP4

Convert a WebM video to an H.264 MP4 that plays everywhere — in your browser.

Seleccioneu un fitxer de vídeo

WebM (VP8/VP9) — converted to H.264 MP4 in your browser

Fes clic per triar o deixa anar un fitxer aquí

Com WebM to MP4

1
Add your WebM
Drop in the .webm file — it's read in your browser.
2
Convert
Click Convert to MP4; the video is decoded and re-encoded as H.264/AAC with the WebCodecs API.
3
Download
Save the MP4 — it plays on iPhone, in Premiere, on social media, everywhere.

Related PDF tools

Compress VideonewShrink an MP4, MOV or WebM by re-encoding it at a lower bitrate — in your browser, nothing uploaded.MP4 to WebMnewConvert an MP4 to a smaller VP9 WebM for the web — in your browser.Video to GIFnewTurn a short video clip (MP4, MOV, WebM) into an animated GIF — in your browser.Trim VideonewCut a video down to just the part you want, in your browser.

WebM to MP4 — preguntes freqüents

Is my file uploaded?+

No. The WebM is decoded and re-encoded to MP4 entirely in your browser with the WebCodecs API.

Why convert WebM to MP4?+

WebM (VP8/VP9) doesn't play on iPhones, in most video editors, or on some social platforms. H.264 MP4 plays essentially everywhere.

Is quality lost?+

It's a re-encode, so there's a small generational loss. At the default quality it's hard to notice; the file size is usually similar or a little larger.

Which browsers work?+

Chrome, Edge and Safari 17+. The tool tells you if your browser can't encode H.264.

Pugeu els meus fitxers a un servidor?+

No: cada eina aquí processa els teus fitxers totalment al teu dispositiu, i no es puja res a un servidor. L'única excepció són les eines d'IA, que envien el text extret (no el fitxer) a Claude per fer la seva feina.

Hi ha un límit de mida de fitxer?+

No imposem cap límit artificial, però com que el processament passa al teu navegador, els fitxers molt grans (500+ MB o 1.000+ pàgines) estan limitats per la memòria del teu dispositiu, no per nosaltres.