Convert any video file to MKV format online for free. Fast, secure, and easy-to-use video to MKV converter with no software installation required.
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Max file size: 50 MBMax duration: 30 min
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Drag and drop your MP4 file, or click to browse for it.
Choose MKV as the output and click Convert. The conversion runs on our servers, so your device does none of the work.
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Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
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How the two formats differ on the things that change your result.
| Specification | MP4 (source) | MKV (result) |
|---|---|---|
| Container | MPEG-4 Part 14 | Matroska |
| Developed by | MPEG | Matroska.org |
| Introduced | 2003 | 2002 |
| Video codecs | H.264, H.265, AV1 | H.264, H.265, VP9, AV1 |
| Audio codecs | AAC, MP3, ALAC | AAC, FLAC, Opus, AC-3, DTS |
| Max resolution | 8K UHD | 8K UHD |
| Typical bitrate (1080p) | 5–20 Mbps | 8–40 Mbps |
| Multiple audio tracks | Yes | Yes |
| Subtitle tracks | Embedded (soft) subtitles | Embedded (soft) subtitles |
| Chapter markers | Yes | Yes |
| Streaming optimized | Yes | No |
| Licensing | Patent-licensed | Royalty-free |
| Plays natively on | Native: Web browsers, Windows, macOS, iOS, Android, Smart TVs | Native: Windows · Needs a player: macOS, iOS, Android, Smart TVs |
| Best for | web delivery, social media uploads, sharing with anyone | media archives, multi-language releases, home theatre |
Both containers can carry H.264, so this conversion is largely a container change rather than a full re-encode. That keeps quality intact and makes it fast.
Expect the bitrate to move from roughly 13 Mbps to about 24 Mbps at 1080p, and file size to follow.
MKV dates from 2002 and is not natively supported by modern browsers, so plan on a desktop media player for playback.
Converting MP4 to MKV moves the video from the MPEG-4 Part 14 container, introduced in 2003, into Matroska, which arrived in 2002. Whether the picture is re-encoded or copied across depends on the codecs both containers accept.
Developed by MPEG in 2003, MP4 carries H.264, H.265, or AV1 video and AAC, MP3, or ALAC audio. That combination sets the upper bound on what any conversion can preserve.
MKV was introduced by Matroska.org in 2002. It carries H.264, H.265, VP9, or AV1 video with AAC, FLAC, Opus, AC-3, or DTS audio and plays natively on Windows.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
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