Convert MKV to MP4 online in seconds — free, with no sign-up. MP4 is lossy and ideal for sharing and publishing video anywhere. Your files are encrypted and deleted automatically after 24 hours.
MKV
Matroska Video — A flexible container that holds multiple audio, video and subtitle tracks.
MP4
MPEG-4 (H.264) — The universal video container — plays on virtually every device, browser and platform.
How to convert MKV to MP4
- 1Upload your MKV file
Click “Choose a file” or drag and drop your MKV file onto the page — no sign-up or email needed.
- 2Convert to MP4
MP4 is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your MP4 file
Your MP4 file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
MKV vs MP4
| MKV | MP4 | |
|---|---|---|
| Full name | Matroska Video | MPEG-4 (H.264) |
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Best for | archiving films with multiple tracks; converted to MP4 for compatibility | sharing and publishing video anywhere |
Frequently asked questions
Does converting MKV to MP4 lose quality?
Both MKV and MP4 use compression, so re-encoding discards a little more data. For a single conversion the change is virtually invisible; just avoid repeatedly re-converting the same file.
What's the difference between MKV and MP4?
Matroska Video (MKV) is lossy and best for archiving films with multiple tracks; converted to MP4 for compatibility. MPEG-4 (H.264) (MP4) is lossy and best for sharing and publishing video anywhere. Convert MKV to MP4 when you need a video for sharing and publishing video anywhere.
Is the MKV to MP4 converter free?
Yes — converting MKV to MP4 is completely free. There's no watermark, no sign-up and no email required, and you can convert as many files as you like.
Are my MKV files private and secure?
Yes. Your uploads are encrypted in transit, processed privately, and automatically deleted within 24 hours. We never share, sell or look at your files.
Can I convert MKV to MP4 on iPhone, Android, Mac or Windows?
Yes. The converter runs entirely in your browser, so it works on any device — iPhone, iPad, Android, Mac, Windows or Linux — with nothing to download or install.
How long does it take to convert MKV to MP4?
Most files convert in a few seconds. Larger files take a little longer, and your upload speed is usually the limiting factor. There's no queue and no waiting for an email.
What else can I convert MKV files to?
Besides MP4, you can convert MKV to AAC, AVI, FLAC, FLV, GIF, JPG and more — see the full list of MKV conversions below.
Other conversions
Last updated July 2026