Tools

Video Conversion

MP4 to MKV

Convert MP4 video to MKV container format.

Browser-sideFFmpeg WASMNo account
Input0 B
OutputNot ready

MP4 to MKV in your browser

Convert MP4 video to MKV container format. This page follows the same ILoveTools structure used by the existing PDF, image and JSON tools: Bootstrap cards, breadcrumb navigation, related links, focused metadata and browser-first processing.

Video files can be large, so processing speed depends on your device, browser memory and clip duration. For best results, start with a short MP4, close unused tabs and keep the page open until the download buttons appear.

Your selected MP4 is not uploaded to ILoveTools. The page loads a client-side FFmpeg WebAssembly engine only when you run the tool, then performs the conversion or edit inside your browser whenever the browser supports the required APIs.

How to use MP4 to MKV

1. Add video

Choose an MP4 file from your device. Merge tools accept multiple MP4 files.

2. Set options

Adjust the fields shown for this workflow, then click Process video.

3. Download

Preview supported outputs and download the processed file directly.

Related tools

MP4 to MP3

Extract audio from MP4 video and save it as an MP3 file.

MP4 to WAV

Extract clean WAV audio from MP4 video in your browser.

MP4 to GIF

Convert a short MP4 clip into an animated GIF.

MP4 to WEBM

Convert MP4 video to browser-friendly WEBM format.

FAQ

Yes. MP4 to MKV is free to use in a modern browser with no account required.

No. The page uses browser-side processing. Your MP4 is read locally by your browser and processed with a client-side FFmpeg engine when available.

Video conversion is CPU-heavy. Large videos can take several minutes and require enough browser memory to complete.

Recent versions of Chrome, Edge and Firefox usually work best because they support the APIs needed by FFmpeg WebAssembly.