Convert MKV to MP4 Online
To convert an MKV file to MP4, upload it below, choose MP4 in the output menu, and download the result — no software required, everything happens in your browser on any device.
MKV is a flexible container popular for recordings and downloads, but that flexibility is exactly why smart TVs, iPhones, iPads, and editors like iMovie or Premiere often reject it. Moving the same video into an MP4 container solves the compatibility problem in one step, without hunting for the right playback app on every device.
How it works
- 1
Upload the MKV file
Drop your MKV into the uploader — files up to 500 MB are supported. The upload runs directly from your browser, so large recordings transfer fast.
- 2
Choose MP4 output
Pick MP4 from the format list. MOV, AVI, WebM, and MKV are also available if a specific device or editor asks for something else.
- 3
Download and play anywhere
Start the conversion and grab the MP4 when it finishes. Copy it to a USB stick for your TV, sync it to your phone, or import it into your editor.
Why use Video-Matic
Fixes TV and phone playback
Many smart TVs and all iPhones ignore MKV files. The same content in an MP4 container plays immediately, with audio and video in sync.
Editor-friendly output
iMovie, Premiere, and most timeline editors import MP4 without complaint, so you can finally cut that MKV recording instead of fighting import errors.
Works in the browser
No VLC converter, no desktop suite. Upload, convert, download — from Windows, macOS, Linux, or even a tablet.
Private by default
Files are processed on EU servers and automatically removed within 24 hours. Nothing is shared, and no watermark is added to your video.
Frequently asked questions
Why does my TV not play MKV files?›
TV manufacturers license a limited set of formats, and MKV support is inconsistent — some models play it, some play only certain codecs inside it, and many refuse it outright. MP4 with standard compression is on virtually every compatibility list, so converting the file is more reliable than testing codec combinations on your TV.
Will the subtitles inside my MKV survive the conversion?›
The conversion focuses on the main video and audio tracks. Soft subtitle tracks embedded in the MKV container are not carried into the MP4. If you need visible subtitles, convert the file first and then use the Add Captions tool, which burns AI-generated captions directly into the picture.
How much does it cost to convert MKV to MP4?›
One conversion costs 1 credit, and a free account starts with 3 credits — enough for three conversions at zero cost. When those run out you can buy a one-time credit pack; there is no recurring subscription. Converted files never carry a watermark.
Is there a file size limit for MKV uploads?›
You can upload MKV files up to 500 MB each. If your recording is bigger than that, trim it into parts first or compress it with a desktop tool before uploading. For most episodes, screen recordings, and camera files, 500 MB is plenty of headroom.