WebM to MP4 Converter
Convert WebM to MP4 for free: screen recordings and web videos become H.264 MP4 files that play on iPhone, Windows and TVs. It all runs in your browser.
WebM is the web format of screen recorders, browsers and many downloads. Its VP8, VP9 or AV1 video and Opus audio do not play everywhere, so they are re-encoded to H.264 and AAC, the MP4 combination that every phone, computer, TV and editor accepts. Re-encoding takes about as long as the video, or less on a fast computer.
What it does
MP4 with H.264 video and AAC audio is the format that plays on every phone, computer, TV, editor and website. This converter reads MOV, MKV, WebM and MPEG-TS files. When the video inside is already H.264 or HEVC, it is copied into the MP4 container without re-encoding, which takes seconds and keeps the exact quality. Other codecs, such as VP8, VP9 and AV1, are re-encoded to H.264 by your browser's video encoder.
How to use it
- Choose the video you want in MP4.
- See whether it will be copied or re-encoded, and click Convert to MP4.
- Download the MP4 file.
Frequently asked questions
Can it convert AVI or WMV files?
No. AVI and WMV are old formats whose codecs browsers cannot read, so a tool that runs in the browser cannot open them. Use a desktop program such as VLC or HandBrake for those.
Is my video uploaded? Is there a size limit?
Nothing is uploaded: the file is read and converted on your device. The limit is your device's memory, since the result is built in memory before you download it. About 2 GB works on most computers; phones handle less.
Which browsers does it work in?
Copying, trimming, muting and rotating work in any modern browser. Re-encoding uses the WebCodecs video encoder of Chrome and Edge, Safari 16.4 or later and Firefox 130 or later. On a computer it is often faster than the video plays.
Which formats can I open?
MP4, MOV, MKV, WebM and MPEG-TS (.ts) files with H.264, HEVC, VP8, VP9 or AV1 video. HEVC needs a device with HEVC decoding, which most recent phones and computers have.
🗜️ Compress Video
✂️ Trim Video
🎞️ Video to MP4 Converter
🔇 Remove Audio from Video
🔄 Rotate Video
🎞️ MOV to MP4 Converter
🎞️ MKV to MP4 Converter
🎵 Video to MP3 Converter
🎬 Video to GIF Converter