Use MKV to MP4 - free
Frequently asked questions
Will every MKV file convert successfully?
MKV can contain codecs like H.265 or VP9 that don’t fit inside a standard MP4 container. Files using H.264 video and AAC/MP3 audio, the most common case, convert reliably.
Does this preserve quality?
When the source uses compatible codecs, this is a fast, lossless container remux with no quality change.
Why would an MKV file fail to convert?
If the MKV uses a video or audio codec that MP4 doesn’t support, the conversion will fail rather than silently produce a broken file.