MP4→MKV
MP4 to MKV
Repackage MP4 into MKV. Keeps subtitles and extra audio tracks without re-encoding.
or drag and drop your file
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How to convert MP4 to MKV
Three steps to an MKV file
11. Upload your MP4
Click “Upload” or drag a video onto the page. HD and 4K files up to 100 MB accepted.
22. Choose MKV output
MKV is pre-selected for lossless remuxing. Keep every subtitle and audio track, or deselect the ones you don't need.
33. Download the MKV
Hit “Convert”. Your .mkv file is ready in seconds, no quality loss. Works with Plex, VLC and Kodi.
Subtitles & multi-audio
MKV stores unlimited subtitle and audio tracks. Our converter remuxes them intact, good for bilingual movies or commentary.
Open, future-proof container
MKV is patent-free and supported by VLC, Plex, Kodi and most smart TVs. Also convert to WebM, AVI, FLV and audio formats here.
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Trim, resize or convert your files further. All tools work in the same browser workspace.
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CONVERTERAVI to MP4
Convert AVI files to MP4 for smaller size and wider device support.
CONVERTERMP4 to FLAC
Extract lossless FLAC audio from MP4 video. Keeps the original sound quality.
CONVERTERWebM to MP4
Convert WebM to MP4 for playback on any device. Drag in, convert, save.
CONVERTERMP4 to WMA
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CONVERTERMP4 to DivX
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CONVERTERMP4 to MOV
Convert MP4 to MOV for QuickTime, Final Cut and other Apple apps.
CONVERTERMP4 to M4A
Strip audio from MP4 and save as M4A. Small files, works on all Apple devices.
CONVERTERMP4 to AVI
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CONVERTERMP4 to WebM
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CONVERTERMP4 to WMV
Convert MP4 to WMV for Windows PCs and classic media players.
CONVERTERMP4 to MPEG
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CONVERTERMP4 to MPG
Convert MP4 to MPG for vintage devices and DVD authoring software.
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CONVERTERMP4 to FLV
Convert MP4 to FLV for legacy Flash and RTMP streaming setups.
CONVERTERMP4 to M4V
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CONVERTERMP4 to MKV
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CONVERTERMP4 to GIF
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CONVERTERMP4 to WebP
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CONVERTERMP3 to MP4
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CONVERTERWAV to MP4
Pair WAV audio with a static image as MP4. Smaller files, easier to upload.
CONVERTERGIF to MP4
Convert GIFs to MP4 for smaller files and sharper playback on any device.
FAQ
MKV supports multiple audio streams, soft subtitles, chapter markers and advanced codecs. Good for archiving or media servers.
No. By default we do a lossless remux, so quality and bitrate stay identical to the source.
Not yet. Existing subtitle tracks are kept, but you can add new ones later with tools like MKVToolNix.
Most modern smart TVs, Roku, Fire TV and players like VLC and Plex handle MKV. Older devices may need MP4.
Videos up to 100 MB are accepted. Larger files take a bit longer but follow the same process.
All transfers use HTTPS. Files are processed in memory and deleted from our servers within minutes after conversion.