How to Convert MKV to MP4 (Play on Any Device)

MKV files don't play on iPhones, most Smart TVs, or social media. MP4 plays everywhere. Upload your file to MegaConvert.io and select MP4 — done in seconds, free, no signup.

The Problem

You downloaded a video in MKV format. It plays fine on your PC in VLC, but your iPhone won't open it, your Smart TV shows an error, and you can't upload it to YouTube or Instagram. MKV is a great container but it has poor device support outside desktop players.

Why Convert MKV to MP4?

• Universal playback — MP4 works on iPhones, Android, Smart TVs, game consoles, and every browser.
• Social media — YouTube accepts MKV, but Instagram, TikTok, and Twitter need MP4.
• Smaller files — MP4 with H.264 is typically more compact than MKV.
• Streaming — MP4 supports progressive download for smooth web playback.

How to Convert Online

1. Go to megaconvert.io/mkv-to-mp4.
2. Drag and drop your .mkv file.
3. Download your .mp4 file.

No account needed. No watermarks. Files auto-delete after 1 hour for privacy.

Related Conversions

• AVI to MP4 — another legacy format.
• MOV to MP4 — iPhone/Mac video.
• WebM to MP4 — Google's web video.
• FLV to MP4 — old Flash video.
• MP4 to MP3 — extract just the audio.

For Developers: API

curl -X POST https://megaconvert.io/api/v1/convert/sync \
  -H "X-API-Key: YOUR_API_KEY" \
  -F "file=@input.mkv" \
  -F "output_format=mp4" \
  -o output.mp4

Free tier: 10 conversions/day. API docs → | SDKs →