Video Converter — MP4, WebM & MKV in Your Browser
Turn a video into the format you need — MP4 for everything, WebM for the web, MKV for players and editors — without the file ever leaving your device.
Video Converter
MP4, WebM & MKV — converted locally
MP4 is the safe choice for phones, WhatsApp and the web. Audio is re-encoded to match each format.
First run downloads the local engine (~31 MB) once, then your browser caches it for next time. Processing speed depends on your device — short clips are quickest, and longer videos simply take longer. Everything happens in this tab; the network stays empty the whole time.
How to convert a video format in your browser
- Choose the video you want to convert.
- Pick the target format: MP4 for maximum compatibility, WebM for web players, MKV if you are moving the clip between players or editors.
- Run the conversion and wait for the progress bar. The picture is re-encoded at high quality; audio is converted to the codec each container expects (AAC for MP4/MKV, Opus for WebM).
- Preview the result and download it.
Formats matter less than people think, but they matter: a WebM recorded on a Linux desktop may not play on a phone, and a screen recording may arrive in a container your player refuses. This converter fixes that without the file ever touching a server.
Why it's private
Converting a video online means uploading the whole file so a data-centre can re-wrap it — and for sensitive footage that upload is the point of failure. Here the conversion is a local encode in your browser: the input never leaves, the output downloads directly, and closing the tab leaves no copy behind.
Who needs this
Developers normalising clips for a site (WebM), people exchanging footage with a player that only speaks MP4, and editors moving masters into MKV without a round-trip through the cloud.