Convert Video to MKV

Convert MP4, WebM, MOV, and AVI videos to Matroska (MKV) container format in your browser.

How to Use

Upload video file

Choose MP4, WebM, or MOV video.

Set MKV options

Choose resolution or keep original video quality.

In-browser packaging

Package video and audio streams into Matroska container.

Download MKV

Save the MKV file directly to your device.

Convert Videos to Versatile Matroska (MKV)

Matroska (.MKV) is a world-renowned open-standard multimedia container format capable of holding an unlimited number of video, audio, picture, and subtitle tracks inside a single file. Unlike proprietary formats, MKV is completely open-source and flexible.

Convert your MP4, WebM, MOV, or AVI files into MKV format directly inside your browser tab without server uploads.

Real-World Examples & Use Cases

High-Definition Video Archiving

Archive master movie files, home recordings, and high-definition 1080p/4K media inside robust, open-source MKV containers.

Multi-Track Media Preparation

Prepare video assets for HTPC media servers (Plex, Kodi, Jellyfin) that recommend MKV for multi-audio and subtitle stream support.

Lossless & Future-Proof Archiving

Preserve media assets in an open format that will remain accessible across future operating systems and open-source media software.

Screen Recording & Stream Packaging

Package desktop and webcam recordings into crash-resistant MKV files that prevent corrupted files if power drops.

How It Works

Matroska MKV Architecture & Specs: Container Format: Matroska Media Container (.mkv) Base Syntax: Extensible Binary Meta Language (EBML) Supported Codecs: Unlimited (H.264, H.265/HEVC, VP9, AV1, AAC, MP3, FLAC, PCM, SubRip, ASS) Key Advantage: EBML parser allows streaming, indexing, and partial file recovery even if the container is truncated.

Frequently Asked Questions

What is the main advantage of MKV over MP4?▼

MKV supports an unlimited number of audio tracks, subtitle files, and chapters, and is less vulnerable to file corruption during recording.

Can I play MKV files on Windows and Mac?▼

Yes! Popular free media players like VLC, IINA, and PotPlayer play MKV files natively on Windows, macOS, and Linux.

Is video conversion private?▼

Yes. Processing is handled 100% locally on your computer via client-side WebAssembly. No files are uploaded to cloud servers.

Does converting to MKV reduce video quality?▼

No. Remuxing into an MKV container preserves full original video and audio quality without degradation.

Can I convert MKV back to MP4 later?▼

Yes! ConvertWithMi offers bidirectional conversion, allowing you to convert MKV back to MP4 anytime.

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