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MKV to MP4

Convert MKV videos to MP4 right in your browser, with no upload.

or drag and drop here · Ctrl+V to paste

Processed on your device. Your files aren't uploaded to any server.

How to use: MKV to MP4

  1. Select your MKV video.
  2. Click Convert to MP4.
  3. Download the converted video.

About this tool

What is MKV? Matroska Video is a flexible video container that supports multiple audio tracks and subtitles. It's ideal for movies with multiple audio tracks and subtitles. For compatibility, players like VLC can play just about anything, but phones, TVs, and social platforms often don't support it.

Why convert to MP4? MP4 is the most widely compatible video format, supported by phones, YouTube, Instagram, and WhatsApp. It's the best choice for sharing videos anywhere—it works on almost every device and social platform.

Frequently asked questions

What's the difference between MKV and MP4?

Both use lossy compression. For compatibility: MKV—players like VLC can play just about anything, but phones, TVs, and social platforms often don't support it; MP4—works on almost every device and social platform.

Does it work in all browsers?

It works in current versions of Chrome, Edge, Firefox, and Safari that support WebCodecs. Processing uses your device’s video acceleration, so it’s usually faster than uploading the file to a website.

Is there a file size or video length limit?

We don’t set a limit. Very large files (several GB) depend on your device’s memory; on phones, we recommend videos that are a few minutes long or less.

Will the video lose quality?

When the codecs are compatible, the data is copied without recompression—so there's no quality loss, and it only takes seconds. Otherwise, the video is re-encoded in high quality.

Are my files uploaded to a server?

No. This tool runs entirely in your browser: your file is read and processed on your device, and not a single byte is sent over the internet. You can even disconnect from the internet after the page loads.

Is it really free? Is there a daily limit?

It's free with no daily limits. Processing happens on your device, so there's no per-use cost and no need to limit you.

Does it work on phones?

Yes. The site works in any modern browser on Android, iPhone, Windows, Mac, and Linux—no installation needed.

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