Free MKV to MP4 Converter

Convert Matroska MKV files to universally compatible MP4. Instant remux, H.264, or H.265 — you choose the mode.

FreeNo signup required3 conversion modes

Drop your MKV file here

or click to browse • .mkv files only

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Instant Remux

Remux mode repackages MKV to MP4 in seconds with zero quality loss — no re-encoding required.

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3 Encode Modes

Remux for speed, H.264 for compatibility, or H.265 for smaller files — pick the right mode for your use case.

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Universal MP4

Output MP4 plays on every device, browser, and platform — YouTube, Instagram, Windows, Android, iOS.

Frequently Asked Questions

What is the fastest way to convert MKV to MP4?

Use Remux mode — it simply repackages the MKV container into MP4 without re-encoding the video or audio. This is instant regardless of file size and preserves 100% of the original quality.

When should I use H.264 or H.265 mode?

Use H.264 when you need broad compatibility across all devices, browsers, and platforms. Use H.265 when you want a smaller file size and are targeting modern devices that support HEVC playback.

Will audio tracks be preserved when converting MKV to MP4?

Yes. In Remux mode all audio tracks are copied as-is. In H.264 and H.265 modes audio is re-encoded to AAC 192k, which is compatible with all devices and platforms.

Why convert MKV to MP4?

MP4 is the most widely supported video format for web browsers, social media, Windows, Android, and iOS. MKV files often cannot be played or uploaded directly on many platforms — converting to MP4 fixes this.