Convert MKV to MP4 — Free & Private
Convert MKV to MP4 online for free. MKV is a flexible container format that supports multiple streams; MP4 is the most universally compatible video format. All processing happens locally in your browser — your files never leave your device.
How to convert MKV to MP4
- 1
Select your MKV file
Click or drag your MKV file onto the converter above.
- 2
Convert to MP4
The output format is pre-set to MP4. Click the convert button to process your file.
- 3
Save instantly
Your converted MP4 file is ready — save it to your device, no email required.
MKV to MP4 — FAQ
Is the MKV to MP4 converter really free?
Yes, completely free. No hidden fees, no watermarks, no file size limits. LocalConvert is open source and free forever.
Are my MKV files safe?
Absolutely. Your files never leave your browser. All MKV to MP4 conversion happens using WebAssembly running locally on your device — no uploads, ever.
How long does MKV to MP4 conversion take?
Most conversions finish in seconds. Larger files may take a little longer depending on your device's speed and memory.
What's the difference between MKV and MP4?
MKV is a flexible container format that supports multiple streams. MP4 is the most universally compatible video format.