MKV to MP4 Converter

How to use MKV to MP4 Converter

1. Open MKV to MP4 Converter — it runs entirely in your browser with no setup.
2. Paste or type your input into the text area, or upload a file where supported.
3. Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server.
4. Review the output instantly; large inputs are handled locally without lag.
5. Copy the result to your clipboard or download it. Your data never leaves the page.

Why use MKV to MP4 Converter?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full media studio suite, so related mkv to mp4 tasks are one click away.

What people use MKV to MP4 Converter for

• Playing an MKV file on a device or TV that will not open it.
• Preparing a video for editing software that rejects MKV.
• Converting for upload to a platform requiring MP4.

MKV to MP4 Converter: limits and things worth knowing

• MKV is a flexible container that can hold almost any codec, several audio tracks and subtitle streams. MP4 is more restrictive, which is exactly why it plays on more devices.
• When the video is already H.264 or H.265, this is a remux rather than a re-encode — fast and with no quality loss at all.
• Extra features often do not survive: multiple audio tracks may be reduced to one, and subtitle formats MP4 does not support are dropped.
• Everything runs locally through FFmpeg in your browser.

Supported formats

Reads: MKV. Writes: MP4.

Is it private and secure?

Your privacy is built in. MKV to MP4 Converter runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Why Browser-Based Tools Are Safer for Your Files — Most online converters upload your files to a server. Client-side tools don't. Here's why that difference matters for privacy.