MKV is the go-to container for home media servers (Plex, Jellyfin, Kodi) because it supports multiple audio tracks, soft subtitles, and chapters. Converting your MP4 to MKV with H.264 video keeps quality identical while adding those features.
Convert MP4 video to MKV — the preferred format for media servers like Plex and Kodi.
Upload your MP4 file using the tool above, make sure the output codec is set to H264 and the container to MKV, then click Convert. No software installation required — encoding runs on our GPU servers.
Yes. The public tool works without sign-up for capped preview jobs up to 720p and 200 MB. Create a free account to unlock up to 8K/120fps, larger files, starter credits, and production encoding workflows.
Encoding speed depends on file length, queue depth, codec, and selected resolution. Short public jobs usually finish quickly, while account jobs give you higher limits and production controls.
H.264 (AVC) is a modern video codec with broad compatibility across virtually all devices and platforms. Converting to MKV is ideal for maximum device compatibility — every TV, phone, browser and player supports H.264.
Yes. By default the tool re-encodes audio to AAC at 192 kbps for MP4/MKV/MOV, or Opus at 128 kbps for WebM. You can also choose to copy the original audio stream unchanged or strip it entirely using the Audio selector.
The public encoder is useful for quick previews. For larger files, up to 8K/120fps output, bulk jobs, API access, storage outputs, and webhooks, create an account and run production workflows with predictable NEU estimates.