MKV to MP4 Converter
Convert MKV video to MP4 right in your browser. MKV is a flexible container that can hold many codecs and tracks, while MP4 is the universal video format that plays on virtually every device. Conversion uses your device's built-in video encoder where available, so it's fast — and because it runs locally, your video is never uploaded.
Drop a video here or click to browse
Converted on your device. Nothing is uploaded. Large files run best on desktop.
How to convert MKV to MP4
- Drop your MKV file into the box above, or click to browse.
- Choose MP4 as the output format.
- Click “Convert to MP4”. Your device does the work — no upload.
- Download your MP4 video. No watermark, no sign-up.
Frequently asked questions
Is this MKV to MP4 converter free?
Yes — completely free, no account and no watermark. The only limit is your device's memory and CPU/GPU, since it runs locally.
Are my videos uploaded?
No. Your MKV video is processed entirely in your browser and never leaves your device.
Why is it faster than other converters?
Where your browser supports it, conversion uses the device's hardware video encoder (WebCodecs). If not, it falls back to a built-in software engine.
What size videos can I convert?
Short to medium clips work well. Very large or long videos use a lot of memory — a desktop browser is recommended.