მთავარი მიღებული
- 01MKV (Matroska) is the preferred container for media servers like Plex, Kodi, and Jellyfin.
- 02Unlike MP4, MKV supports unlimited audio tracks, subtitles, chapters, and attachments in a single file.
- 03Conversion runs locally via FFmpeg WebAssembly — no upload, no account, no watermark.
- 04VLC, MPV, and most media players open MKV natively; install VLC for universal playback.
Why MKV Is the Format of Choice for Media Libraries
MP4 is the universal format for sharing and social media, but it has limitations when you're building a media library. The MP4 container supports only two audio tracks and a single subtitle stream, caps at limited chapter support, and is a proprietary standard. Matroska (MKV) was designed specifically to overcome these constraints: it's open, free, and can hold an unlimited number of audio tracks, subtitle streams, and chapters in a single file.
Plex, Kodi, and Jellyfin all favor MKV for these reasons. A movie rip with three audio languages and two subtitle tracks fits neatly in one MKV file — no separate subtitle downloads, no switching apps. For personal archives, MKV is also a future-proof choice: the format is openly documented and not controlled by any single company, meaning your files will still be readable decades from now.
How to Convert MP4 to MKV
Works with any MP4 file intended for media servers or long-term storage.
- 01
Open your MP4 file
Drag your MP4 onto the upload area or click Choose file. The file loads locally — nothing is uploaded.
- 02
Set the quality slider
For archiving, push the quality slider high (90–100) to preserve maximum detail. For streaming on a local network, 75–80 produces excellent results with smaller files.
- 03
Click Convert
FFmpeg WebAssembly re-encodes the video and packages it in a Matroska MKV container. Progress is shown on screen.
- 04
Download the MKV
Click Download when conversion is complete. Add the MKV to your Plex, Kodi, or Jellyfin library, or store it for long-term archiving.
Good Reasons to Convert to MKV
- 01Adding files to a Plex, Kodi, or Jellyfin media library
- 02Creating long-term video archives in an open, future-proof format
- 03Storing multi-language audio tracks and subtitles in a single file
- 04Reducing re-encoding cycles — MKV handles high-quality sources well
- 05Matching the format convention of existing MKV-based media collections
Local Conversion — No Server, No Upload
Online converters that upload your files to a server for processing create real privacy risks, especially for personal media libraries. Handytool's MP4 to MKV converter never touches a server. It runs fully inside your browser using FFmpeg compiled to WebAssembly — a local CPU conversion with no network step.
No account is required, no watermark is added, and the output file goes directly to your download folder. Large archive files — which can be several gigabytes — also benefit from local processing because there's no upload wait time and no server-imposed file size limit (only your browser's memory limits the file size you can process).
MP4 to MKV FAQ
How do I convert MP4 to MKV online for free?
Drop your MP4 onto the converter, set your preferred quality, click Convert, and download the MKV. No sign-up or install required.
Why convert MP4 to MKV?
MKV supports unlimited audio tracks, subtitles, and chapters — features MP4 limits. It's the preferred container for Plex, Kodi, and Jellyfin media libraries and is widely used for high-quality video archiving.
What players can open MKV files?
VLC, MPV, Plex, Kodi, Jellyfin, and PotPlayer all support MKV. Standard Windows and macOS players don't open MKV by default — install VLC for universal desktop support.
Will I lose quality converting MP4 to MKV?
Some, since the file is re-encoded. At a quality setting of 80 or above the difference is barely perceptible. For archiving, push the slider to 95–100 for maximum fidelity.
Is my video uploaded to a server?
No. The converter runs entirely inside your browser using FFmpeg WebAssembly. Your video files never leave your device and nothing is stored or logged.