SweetcraftVideo to MP4
Convert MOV, WebM, MKV and AVI containers to H.264 MP4 locally.
About this tool
This converter turns MOV, WebM, MKV and AVI files into standard MP4 — H.264 video with AAC audio — the combination that plays on practically every phone, browser and messaging app. The work is done by an FFmpeg engine that runs inside your browser tab, so screen recordings, camera exports and downloaded clips can be standardized without being uploaded anywhere.
Conversion re-encodes the video rather than copying it, which has two consequences worth knowing: subtitle tracks are not carried over, and the resolution you select is a ceiling, not a target — smaller sources are never enlarged. Common codecs inside those containers are supported; encrypted, damaged or unusual streams may fail, and the page tells you per file when one does.
How to use Video to MP4
- Choose up to four video files from your device (MOV, WebM, MKV or AVI, up to 150 MiB each).
- Review the output settings. The resolution is a maximum — pick a lower one only if you need a smaller file.
- Run the conversion, preview each MP4 in the page to check picture and sound, then download the finished files.
Keep the original files and inspect the exported result before publishing or sharing it.
Frequently asked questions
Will every MOV, AVI or MKV work?
These are containers, and the codec inside determines compatibility. Common inputs work with the bundled FFmpeg engine; encrypted, damaged or unusual streams may fail.
Does converting preserve the original quality?
No. Video is encoded to H.264 and audio to AAC, which are lossy. The selected resolution is a maximum; small sources are not enlarged. Subtitle tracks are not copied.
Are my files uploaded?
No. FFmpeg runs on your device. The engine assets download on first use; your selected media stays in browser memory. Each file is limited to 150 MiB and each batch to 250 MiB.