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MKV to MP4 Converter

Convert Matroska video to MP4 for phones, smart TVs and editors.

Converters Reviews Free · no sign-up

Drop an MKV here, or click to choose one

Converted on your device — the video is never uploaded

Result

Quick Tool Overview

The MKV to MP4 Converter re-encodes the first video and audio track of a Matroska file to H.264 and AAC, and says plainly what MP4 cannot carry across.

What it does
Converts MKV video to MP4
You give it
A .mkv file of any size
You get back
An MP4 for phones, TVs and editors
Best for
Playing high-quality rips on a TV
Converters Free, unlimited use No sign-up Runs in your browser

About the MKV to MP4 Converter

MKV is the container of choice for high-quality video: it holds several audio tracks, subtitles, chapters and almost any codec. That flexibility is exactly why phones, smart TVs, consoles and editing software so often refuse it.

The conversion runs in your browser through ffmpeg.wasm — the real ffmpeg, compiled to WebAssembly. Nothing is uploaded: a wedding video, a client recording or an unreleased track never leaves your machine. The engine is a one-off download of about 32 MB, after which your browser caches it and every later conversion starts immediately.

The first video and audio tracks are converted to H.264 and AAC in an MP4 with faststart metadata. Extra audio tracks, subtitles and chapters are left behind, because MP4 has nowhere to put them — the page says so rather than quietly dropping half your file. Choose the quality and speed, scale down, change the frame rate, trim, or remove the audio.

Key features of the MKV to MP4 Converter

Honest about losses

Extra audio tracks, subtitles and chapters are reported, not hidden.

Quality control

Choose the trade-off between size and picture.

Resize and reframe

Scaling down speeds the encode up a great deal.

Trim as you convert

Give a start time and a length to take just the part you need.

Nothing is uploaded

ffmpeg runs inside the browser tab, so the file never leaves your computer.

How to use the MKV to MP4 Converter

  1. 1

    Drop the MKV in

    Any Matroska file, any size.

  2. 2

    Choose quality and size

    Scaling to 1080p or 720p speeds things up a great deal.

  3. 3

    Trim if you want a section

    A start time and a length.

  4. 4

    Convert and download

    An MP4 for the TV or the phone.

Frequently asked questions

They are not carried over. MP4 subtitle support is limited and inconsistent; extract them separately with a subtitle tool if you need them.

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