How to Convert MP4 to MKV Online
Upload your MP4 video file
Click the upload area or drag and drop your MP4 file from your computer, phone, or cloud storage. Our MP4 to MKV converter runs in the browser, so you do not need to install any software or create an account.
Choose MKV as the output format
After your MP4 uploads, open the format list and select MKV as the target container. For quick online conversion, default settings are applied automatically to keep quality. Advanced export controls are available in the desktop app.
Start conversion and download your MKV
Hit the Convert button to change your MP4 to MKV. When the process finishes, download the MKV video to your device. For many files or custom codecs like H.265, switch to the desktop version for flexible batch processing.
MP4 vs MKV: What’s the Difference?
|
MP4
|
MKV
|
|
|---|---|---|
| File Extension | .mp4 | .mkv |
| Full Name | MPEG-4 Part 14 | Matroska Video |
| Description | MP4 is a widely supported container format for video, audio, subtitles, and metadata, optimized for streaming and device compatibility with small file sizes and efficient compression options. | MKV is a flexible, open-standard container that can hold multiple video, audio, and subtitle tracks, plus chapters and metadata, making it popular for high-quality archives and home media servers. |
| Associated Programs | VLC media player, Windows Media Player, QuickTime Player, iTunes, many mobile video apps | VLC media player, MPC-HC, KMPlayer, PotPlayer, Plex, Kodi |
| Initial Release | 2001 | 2002 |
| Developer | Moving Picture Experts Group (MPEG) | Matroska Project |
| Common Use Cases | Online streaming, mobile playback, social media video sharing, downloadable movies and TV episodes | High-quality movie backups, multi-audio releases, fansubs, Plex and Kodi libraries, advanced archival workflows |
| MIME Type | video/mp4 | video/x-matroska |
Why Use This MP4 to MKV Converter
Fast, browser-based MP4 to MKV conversion
Convert MP4 to MKV online directly in your browser with a simple upload-select-convert workflow. No installation or registration is required, and the tool is optimized for quick, hassle-free single-file conversions.
Preserve video quality when changing formats
The conversion engine is designed to keep your original quality as much as possible when switching from MP4 container to MKV. For many videos, the change focuses on the container, avoiding unnecessary re-encoding when feasible.
Simple, guided workflow for every user
A clean interface leads you through importing an MP4, selecting MKV, and starting conversion. Clear labels and minimal settings make converting MP4 file to MKV approachable even if you are new to video format conversion.
Secure, watermark-free online conversion
Use a secure connection for every upload and download, with no watermarks added to your converted MKV. Convert MP4 to MKV online free within the usage limits, without hidden branding overlaying your video content.
Desktop batch MP4 to MKV conversion
Install the desktop app to queue many MP4 videos and convert them to MKV in one batch. This offline workflow is ideal for large libraries, such as Plex collections, where processing each file individually online would be slow.
Advanced export control in the desktop app
On desktop, fine-tune codec choice, bitrate, resolution, audio tracks, and more when converting MP4 to MKV. Set H.264 or H.265, adjust compression, and customize profiles, features not available in the simplified online converter.
MP4 to MKV Conversion FAQs
Can I convert MP4 to MKV online for free?
Does converting MP4 to MKV increase video quality?
Will MP4 to MKV conversion reduce file size?
Why would you convert MP4 to MKV instead of staying with MP4?
Is MKV higher quality than MP4 and are there disadvantages?
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