Free MP4 to MKV Converter Online
Convert MP4 to MKV — lossless, retains all audio tracks and subtitles. Ideal for Plex and Kodi.
Works on Mac, Windows, Linux, iPhone, and Android — no download or install required.
Drag a MP4 file here or click to select
File should not exceed 1GB
Related Tools:
How to Use This Tool
1
Drag and drop your MP4 file onto the upload area, or click to browse your files
2
Click "Convert to MKV" to start the conversion
3
Wait while our servers copy the file into a MKV container — usually just a few seconds
4
Click "Download" to save your converted MKV file
What is MP4?
MP4 (MPEG-4 Part 14) is the most widely supported video format in the world. It uses H.264 or HEVC video with AAC audio and plays on virtually every device and platform. It's the standard format from cameras, phones, streaming downloads, and screen recorders. Converting from MP4 to MKV is usually motivated by wanting a more flexible container for media server use.
What is MKV?
MKV (Matroska Video) is an open-source container format that can hold an unlimited number of video tracks, audio tracks, subtitles, and chapters in a single file. It's the preferred format for Plex, Kodi, Jellyfin, and other media servers. MKV supports virtually every codec, making it ideal for archiving or managing a media library where you want to keep all audio and subtitle options intact.
Why Convert MP4 to MKV?
The most common reason to convert MP4 to MKV is for use with Plex, Kodi, or Jellyfin — media servers that handle MKV better and give you more control over multiple audio tracks and subtitles. MKV can also store chapters and metadata more flexibly than MP4. Our converter performs a lossless stream copy: no re-encoding, no quality loss, and the conversion is nearly instant regardless of file size because we're just changing the container. The resulting MKV will have identical video and audio quality to your original MP4. No account needed for files up to 1GB.
Key Features
Lossless Stream Copy
No re-encoding — video, audio, and subtitle data is copied directly into MKV with zero quality loss
Plex, Kodi & Jellyfin Compatible
Output is fully compatible with all major media servers and media players
No Account for Files up to 1GB
Convert immediately without creating an account or entering your email
Preserves Subtitle Tracks
MKV supports multiple subtitle streams — all tracks from your MP4 are preserved in the output
Secure & Private
Files are transferred over SSL and automatically deleted from our servers after download
No Watermarks
Your converted MKV is completely clean — no branding or logos added
Perfect For
Plex Media Server
Kodi & Jellyfin
Media Library Archiving
Multiple Audio Tracks
Subtitle Preservation
HandBrake Workflows
Free Usage Limits
Free (No Account)
1GB
max file size
3
conversions per day
3GB
bandwidth per day
14-Day Free Trial
5GB
max file size
5
conversions per day
25GB
bandwidth per day
14-day trial · cancel anytime
Frequently Asked Questions
Take Your Videos Further
Need more than just conversion? With vitelnk, you can embed your processed video on any website, add password protection, expiring links, viewer registration, and analytics.
14-day free trial · cancel anytime.
Privacy & Security
Your files are processed securely with SSL encryption and automatically deleted after download. We never store or share your files. All processing happens on our secure servers.