MKV Converter
MKV carries every track and subtitle, and plenty of devices reject it.
Up to 50 MB per file. Sign up free to convert files up to 100 MB.
| File name | Size | Convert to |
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Checking files and selected output formats.
How to convert MKV files online
Convert Matroska MKV containers to widely supported formats while preserving audio tracks and subtitles.
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1
Upload your MKV video
Drag and drop MKV files with multiple audio tracks, embedded subtitles, and chapter markers. The converter reads H.264, H.265, VP9, and AV1 video streams inside MKV containers.
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2
Select your output format
Choose MP4 for universal playback on phones, tablets, and smart TVs. Select MOV for Apple ecosystem editing, or WebM for open-source web delivery. The primary audio track and first subtitle stream are carried over.
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3
Download converted video
Download your converted video file with audio in sync and subtitles preserved where the target format supports them. Chapter markers transfer to formats that support chaptering.
Video Format Comparison
Choose the right output format when converting MKV video files.
| Format | Compression | File size | Compatibility | Best For |
|---|---|---|---|---|
| MP4 | H.264/H.265 | Small–medium | Universal | Sharing, streaming, social media |
| MOV | H.264/ProRes | Medium–large | Apple, QuickTime | Mac editing, iPhone recordings |
| MKV | Multiple codecs | Large | PC, media players | High-quality archiving, subtitles |
| WebM | VP8/VP9 | Small | Web browsers | Web embedding, HTML5 video |
| AVI | Various | Large | Windows, legacy devices | Legacy compatibility, editing |
Reasons to convert MKV videos
Apple devices do not natively play MKV files. Convert MKV to MP4 or MOV for instant playback on iPhone, iPad, Apple TV, and in Safari without third-party apps.
Many smart TVs and streaming sticks struggle with MKV, especially those with complex codec combinations. Convert to MP4 for guaranteed playback on Samsung, LG, Roku, and Chromecast.
YouTube, Vimeo, and most social platforms prefer MP4 over MKV. Convert MKV to MP4 before uploading for faster processing, fewer errors, and optimal transcoding on the platform side.
MKV files with lossless audio tracks can be very large. Convert to MP4 with AAC audio to reduce file size significantly while keeping excellent audio quality for normal playback.
MKV containers often embed multiple audio and subtitle tracks. Convert to MP4 with your preferred audio track selected, or extract audio to MP3/FLAC for music or podcast use.
Convert MKV video online, no desktop apps, no plugins. Files up to 100 MB are always free, and all videos are deleted from our servers within 1 hour.
About the MKV Format
MKV (Matroska Video) is an open-source multimedia container format created in 2002 by the Matroska project. Named after the Russian matryoshka nesting dolls, MKV is designed to hold virtually unlimited numbers of video, audio, and subtitle tracks within a single file. It can encapsulate almost any video and audio codec, making it one of the most flexible container formats available today.
MKV is the preferred format for high-quality video archiving, HD and 4K content, and media libraries that require multiple audio languages or subtitle options. Its open-source nature and codec-agnostic design mean it can adapt to new compression technologies without format changes. The main drawback is compatibility, MKV is not natively supported by all devices, particularly older smart TVs, gaming consoles, and some mobile players. For broad distribution MP4 remains more universally playable, but for personal libraries and archival purposes MKV is often the superior choice.