Convert MKV to MP4
Turn your MKV file into an MP4 that plays where you need it, with nothing to install.
- Free to start
- Nothing to install
- Up to 1GB
How to convert MKV to MP4
Upload your MKV file
Drag and drop a MKV file to turn into MP4, or click to browse. Anything under 1GB, and nothing is installed.
Confirm MP4 as the output
MP4 is already selected, so there is nothing to configure. Switch to another format in the panel if MKV needs to go somewhere else.
Convert and download
We convert the MKV on our servers, usually in under a minute. Create a free account to download the MP4.
Why convert MKV to MP4?
MKV (Matroska) is an open container that can hold any codec plus unlimited audio tracks, subtitle tracks and chapters. That flexibility makes it great for archives and useless for sharing.
The practical problem: Browsers, phones and social uploads reject MKV almost universally. Editing tools often refuse to import it, or import picture without audio. Nobody can preview it without installing VLC first.
MP4 solves that. Plays natively on every phone, browser, TV and editing app with no extra codecs. Every upload form accepts it, from YouTube and LinkedIn to Slack and email. H.264 keeps files small enough to send while still looking sharp at 1080p.
MKV can hold several audio tracks and a stack of subtitle tracks, and MP4 handles that far less gracefully. The conversion keeps the picture and the primary audio track, which is what you want for sharing or uploading. If your MKV is a multi-language archive you care about keeping intact, keep the original as well as the MP4.
Container
Typical codecs
Best for
Plays on
File size
| Feature | MKV | MP4 |
|---|---|---|
| Container | Matroska | MPEG-4 Part 14 |
| Typical codecs | Almost anything: H.264, HEVC, AV1, VP9 | H.264 video, AAC audio |
| Best for | Archiving with multiple audio and subtitle tracks | Sharing anywhere, uploads, web embeds |
| Plays on | VLC and desktop players; rarely anywhere else | Every phone, browser, TV and editor |
| File size | Depends entirely on the codec inside | Small for the quality |
MKV to MP4 questions
Is the MKV to MP4 converter free?
Yes. Convert and preview the result for free, then create a free account to download it. There is no per-file charge and no watermark on the MP4 itself beyond the free-plan badge.
Do I need to install any software?
No. The conversion runs on our servers and you use it from a browser tab, so it works the same on Windows, macOS, Linux, iPhone and Android. Nothing to install at either end. Where MKV plays: VLC and desktop players; rarely anywhere else. Where the MP4 you get back plays: Every phone, browser, TV and editor.
Does converting MKV to MP4 reduce the quality?
Converting re-encodes the video, so it is not bit-for-bit identical. We encode at a high quality target, which keeps the result visually indistinguishable from the MKV on normal viewing. What changes is the container and the codec. MP4 holds: H.264 video, AAC audio. Converting the same file back and forth repeatedly will eventually show, so keep your original.
How large a file can I convert?
Anything under 1GB per upload, which is more footage in some formats than others. MKV: Depends entirely on the codec inside. MP4 coming back: Small for the quality. For anything bigger, trim or compress it first, both are free tools here.
Is my file kept private?
Your upload is processed and then held only as long as your project needs it. Nothing is published, indexed or shared unless you create a share link yourself.
What happens to the subtitles in my MKV?
Soft subtitle tracks are not carried into the MP4. If you need captions on the output, run the file through REQO’s transcription and burn styled captions into the video instead.
Other formats
Everything else you can do here.
Every conversion for a format
Convert to MP4
Convert to WebM
Convert to AVI
Convert to WMV
Convert to 3GP
Convert to M4V
Convert to MPEG
Convert to GIF
Convert to MP3
Convert to WAV
Convert MKV to MP4 now
Free, nothing to install, and the file stays open in a full video editor afterwards.