MKV to MP4 Converter

Questions fréquemment posées

Does converting MKV to MP4 reduce quality?

If the MKV already contains H.264 video and AAC audio, the streams are copied into a new MP4 container without re-encoding — that takes seconds even for long recordings and loses no quality.

Is there a file size limit?

No fixed limit. The video is read in small slices and the result is streamed to your disk, so even multi-gigabyte files work without filling up memory.

Is my video uploaded to a server?

No. The file is read and written inside your browser tab using WebCodecs — nothing is uploaded, there is no account and no watermark. Once loaded, the page also works offline.