Free Online mkv to mp4 ConverterFree, Secure, and Fast

Convert videos in your browser while preserving quality, audio, and subtitles—no server uploads required. Perfect for playing mkv files on mobile devices, Smart TVs, sharing on social media, or easily distributing videos to others.

Recommended: Each file should be under 1.5GB. Maximum 10 files at a time.

How to Convert mkv to mp4 Online

1

Select Your mkv File

Click "Select File" or drag the mkv video you want to convert to mp4. You can add multiple files at once.

2

Click "Convert" and Wait a Few Seconds

The tool processes each video in your browser, and thanks to sequential processing, a 500MB file converts in just seconds.

3

Download Your mp4 Instantly

When everything's done, download each video separately or use "Download All." The mp4 retains the original audio and subtitles.

mkv to mp4 Converter Features

Completely Free

Convert mkv to mp4 without paying a dime or dealing with hidden subscriptions.

Always Available Online

Our online mkv to mp4 converter works from any browser—no software installation needed.

User-Friendly Interface

Just three clicks to convert mkv to mp4—no technical expertise required.

Fast Conversion

Even a 500MB file converts in seconds thanks to local processing power.

Batch Conversion

Add multiple mkv files and the system converts them one after another automatically.

Private and Secure

Conversion happens 100% in your browser—your videos never leave your device.

Responsive on All Devices

The interface adapts to mobile phones, tablets, and computers for a comfortable experience on any screen.

No Usage Limits

Ideal for unlimited mkv to mp4 conversion—we don't impose daily quotas or frequency restrictions.

No Registration Required

Start converting immediately—no email or account creation needed.

How to Get the Best Experience Converting mkv to mp4 Online

  • 1

    Keep Files Under 1.5GB

    The converter is most stable with medium-sized files. If your mkv is very large, compress or trim it beforehand using FFmpeg on your computer.

  • 2

    Avoid Canceling Mid-Process

    Each video converts in turn. If you stop a job in progress, refresh the page before starting another to free up browser memory.

  • 3

    Download When Done and Refresh the Tab

    After conversion completes, download the mp4 and reload the site to ensure browser resources are properly recycled.

  • 4

    Keep the Tab Active

    Use Chrome or Edge on desktop, prevent your computer from sleeping, and don't close the tab until you see the "Download" button.

  • 5

    Use FFmpeg for More Control

    When you need to adjust bitrate, resolution, or advanced subtitle settings, process the video with FFmpeg locally, then verify the result with the online converter.