Convert MKV to MP4 Online (Without Quality Loss)

Stuck with an MKV video that won’t play on your TV, phone, or editing software?
MKV is powerful, but not always compatible. By converting it to MP4, you keep great quality while making the file readable almost everywhere.
In this guide, you’ll see how to convert MKV to MP4 online, without installing any software, using IloveMP4.

Quick steps: convert MKV to MP4

1. Upload your MKV file

   • Open IloveMP4 in your browser.
   • Drag and drop your .mkv file or click to select it from your computer.

2. Select MP4 as output format

   • Make sure MP4 is selected as the output format.
   • When possible, keep the same resolution (1080p, 4K…) and video codec to limit quality loss.

3. Start the conversion

   • Click “Convert now”.
   • Wait for the processing to finish, then download your new .mp4 file ready to play everywhere.

Ready to go?
Convert MKV to MP4 now

Why convert MKV to MP4?

MKV (Matroska) is often used for:

• movies or TV shows,
• high‑quality recordings,
• files with multiple audio tracks or subtitles.

But many devices don’t handle MKV well.

Switching to MP4 gives you:

• Maximum compatibility: TVs, phones, tablets, browsers, game consoles, and more.
• Smoother playback: fewer errors like “unsupported format” or random freezes.
• Easier sharing: upload and send via WhatsApp, Google Drive, social networks, etc.
• Simpler editing: most video editors are optimized for MP4.

How to keep quality as high as possible

Any video conversion involves re‑encoding at some point. To keep quality close to the original:

• Match the resolution
  Don’t upscale. If your source is 1080p, keep 1080p. Upscaling to 4K won’t magically improve quality.

• Use a reasonable bitrate
  For a standard Full HD video, you can target for example:

  • 5–8 Mbps for web / social content,
  • 8–12 Mbps for fast‑moving scenes or higher quality demands.

• Avoid chained conversions
  Convert MKV → MP4 once, instead of multiple hops (MKV → AVI → MP4), which degrade quality each time.

When to keep MKV vs switch to MP4

Keep MKV if:

• you rely on multiple audio tracks (original + dubbed, commentary, etc.),
• you store videos on a media server or player that fully supports MKV,
• you never share the files outside your own setup.

Prefer MP4 if:

• you want smooth playback on TVs, phones, or laptops,
• you regularly send videos to clients, teammates, or friends,
• you upload to YouTube, TikTok, Instagram, or similar platforms.

Advanced option: convert MKV to MP4 with FFmpeg

For advanced users, FFmpeg lets you convert videos from the command line, sometimes without re‑encoding (so no quality loss):

ffmpeg -i input.mkv -c copy output.mp4

• -c copy tries to copy audio and video streams as‑is, without recompressing.
• If some tracks or subtitles aren’t compatible with MP4, you may still need re‑encoding.

If you don’t want to touch the terminal, IloveMP4 gives you the same goal — MKV to MP4 — through a simple web interface.

Why use IloveMP4 for MKV → MP4?

• Fully online: no software install required.
• Batch conversion: convert multiple MKV files in one go.
• Optimized for large files: great for camera, gameplay, or screen recordings.
• Simple workflow: upload, choose MP4, click convert.

Save time on every export:
Convert your MKV files to MP4

FAQ: MKV to MP4

Is the conversion truly “lossless”?

It can be lossless when the existing streams can be copied directly into an MP4 container.
In most cases, IloveMP4 aims for visually lossless quality — differences are negligible for normal viewing.

How long does the conversion take?

It depends on:

• your MKV file size,
• your upload speed,
• the processing time on the server.

For most standard videos, it only takes a few minutes.

Can I convert several MKV files at once?

Yes — batch conversion lets you upload and process multiple MKV files in a single session, ideal for whole libraries or series.

Will my subtitles still be there?

If your subtitle format is compatible with MP4, it can be preserved.
Otherwise, the video will still play perfectly, but some advanced subtitle tracks may be dropped.