Convert MP4 to MKV
Select Files
Audio, Video and Image supported. Drag or click
Transform MP4 files to MKV format right in your browser. Zero upload, zero storage, zero risk. Just select your files and convert.
How It Works
Drop Your MP4 Files
Drag and drop or click to browse. We accept multiple files at once.
Review & Convert
Preview your files, adjust quality if needed, and start the conversion to MKV.
Download Converted Files
Your MKV files are ready. Download them all in one click.
About These Formats
MKV supports multiple audio tracks and subtitles. Ideal for media libraries and advanced video management.
Frequently Asked Questions
How do I convert MP4 to MKV?expand_more
Upload your files, confirm the conversion settings, and download your converted files. All processing happens in your browser — no server upload required.
Is this MP4 to MKV converter free?expand_more
Yes, completely free with no hidden fees. No sign-up required, no usage limits. All conversion happens in your browser.
Is it safe to convert MP4 to MKV online?expand_more
Your files never leave your device. All conversion happens locally in your browser using WebAssembly technology. We have zero access to your files.
Will I lose quality converting MP4 to MKV?expand_more
Quality depends on the target format and your settings. Lossless formats like PNG preserve original quality. For lossy formats like JPG, you can adjust the quality slider.
Can I convert multiple MP4 files at once?expand_more
Yes, you can convert multiple files at once. Simply drag all your files into the upload area or click to select them.