MP4 to MKV
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Step 1: Upload your MP4 video file
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Step 2: Wait briefly while the conversion completes. The process will begin automatically.
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Step 3: Download the ready-to-use MKV file
Free & Instant MP4-to-MKV Converter
Drop your MP4 file onto the page and press “Convert”. Our server will create an MKV version for you within a few moments – ready to download and watch anywhere.
Why Pick MKV over MP4?
The Matroska (MKV) container keeps the original picture quality, multi-channel audio, subtitles, and chapters in one tidy file – perfect for archiving or high-quality streaming.
Always 100 % Free – No Limits, No Signup
Converter App is completely free to use. We never add watermarks, cap your file size, or ask you to create an account.
Preserved Quality, Finished Fast
Our data centres use dedicated hardware and GPU acceleration. Even large Full-HD or 4 K movies are converted in record time while keeping every detail intact.
Part of the Converter App Toolbox
Need a different format? Converter App hosts dozens of one-click tools for video, audio, images, documents, and more – all just as quick and free.
Your Privacy Comes First
Files are automatically removed from our servers within two hours of conversion. Only you can access the download link – your data stays yours.
What to expect when converting MP4 to MKV
Real numbers from every conversion on this tool since 24 October 2026. Nothing here is estimated: we record how long each job took and how large the files were. File names and contents are never stored.
Expected time by file size
How long conversions take
share of all conversions
- under 1 s53%
- 1–10 s46%
- 10–60 s1%
- 1–5 min<1%
- over 5 min<1%
Times are server processing only, measured after the upload finished; upload and download are not included. Large files take longer, but the limit is the same for everyone: no account, no queue priority to buy. Updated 2026-11-07