Runs in your browser · nothing uploaded
Convert Video
Convert common video files to MP4 or WebM. A media engine loads from a CDN into your browser — your file never leaves this device.
Convert to
MP4 is best for phones and sharing. WebM suits web use. Conversion re-encodes the video, so it is slower than Trim Video and heavy on large files — prefer shorter videos on phones. Your file never leaves this device.
How to convert video to MP4 or WebM privately
Convert everyday video files to MP4 or WebM in your browser with ffmpeg.wasm. Your file stays on the device — useful when a platform only accepts a specific format.
How to use it
- Drop a video such as MOV, MKV, WebM, AVI, or MP4.
- Choose MP4 (best compatibility) or WebM (web-friendly).
- Wait for conversion, then download the result.
When it helps
Handy when a share target wants MP4, a site prefers WebM, or a camera export will not play where you need it.
FAQ
- Which format should I pick?
- MP4 plays almost everywhere (phones, WhatsApp, most apps). WebM is a solid choice for web pages in Chromium browsers.
- Why is this slower than Trim Video?
- Trim can often copy streams without re-encoding. Convert rebuilds the video and audio for the target format, which takes more time and memory.
- Are my files uploaded?
- No. The media engine loads from a CDN into your browser; processing stays on your device.
- What if conversion fails?
- Some codecs are too exotic for the browser engine. Try another export (for example MP4 from the camera app) or a shorter file.
- Does it work on mobile?
- Yes on modern phones, but large videos may be slow or run out of memory. Shorter files are safer.