⇧Drop your MKV file hereor choose a file
STEP 01
Upload Your MKV
Drag your MKV file into the upload area or choose it from your device.
FAST MEDIA TOOLS · MADE SIMPLE
MKV to MP4 Converter
Convert MKV to MP4 in your browser. Choose your settings, then preview and download the result.
Convert MKV to MP4 in your browser
▶Your preview appears hereChoose an MKV file to get started.
OutputMP4
Video codecH.264
H.264 video · First audio track preserved or converted to AAC · No subtitles
Files are processed locally in your browser.
How to Convert MKV to MP4
MKV → MP4Original resolutionH.264 video · Keep qualitySTEP 02
Choose MP4 Settings
Keep the original size or choose a smaller resolution. Compatible H.264 video is copied when possible; otherwise it is re-encoded.
✓ MP4 READYPreview your videoDownload MP4 ↓STEP 03
Convert and Download
Click Convert to MP4. When it finishes, preview and download the MP4.
MKV to MP4: See the Result
Watch a real espresso clip converted from MKV to MP4. See what changes in the file and what stays the same.
REAL CONVERSION · ORIGINAL RESOLUTION
One espresso clip, two containers.
The same video frames, before and after conversion from MKV to MP4.
01 / ORIGINAL MKVSource frame · MKV playback may not be supported in your browser
Source frame · MKV playback may not be supported in your browser02 / CONVERTED MP4
Video codecH.264 → H.264
Resolution1280 × 720 → 1280 × 720
AudioNo audio in sample
Here, the video stream was copied into an MP4 container without re-encoding. The visual quality is unchanged; the file is not necessarily smaller. Other MKV codecs may require re-encoding.
MKV vs MP4
| Feature | MKV | MP4 |
|---|---|---|
| Container | Matroska | MPEG-4 |
| Video codec support | Wide range of codecs | Commonly H.264, HEVC and others |
| Audio tracks | Can contain multiple tracks | Can contain multiple tracks |
| Subtitle support | Supports multiple subtitle formats | Supports selected subtitle formats |
| Device compatibility | Varies by player | Widely supported |
| Typical use | Flexible video archives | Sharing and playback |
MKV and MP4 are containers. This tool copies compatible H.264 video when possible; otherwise it re-encodes. It keeps only the first audio track and does not copy subtitles.
FAQ
Does converting MKV to MP4 lose quality?
When H.264 video is compatible and Original is selected, the video can be copied without re-encoding. Other video codecs or a resolution change require re-encoding, which can reduce quality.
Why won't my MKV play on an iPhone?
Many iPhone apps do not support the MKV container. An MP4 with H.264 video and AAC audio is more widely supported.
Can I convert MKV to MP4 without uploading it?
Yes. The converter reads and processes the file locally in your browser.
Does MKV to MP4 keep subtitles?
No. This converter does not include subtitle tracks in the output. It uses the first video track and, if present, the first audio track.
Is MKV to MP4 free with no watermark?
Yes. The converter is free and does not add a watermark or require an account.
What codec should I choose for MKV to MP4?
This tool outputs H.264 video. It copies compatible H.264 video when possible, or re-encodes to H.264 when needed.
How long does MKV to MP4 take in the browser?
It depends on the file, your device, and whether the video needs to be re-encoded. Copying compatible tracks is usually faster.
Can I convert an MKV larger than 500 MB?
You can try, but large files can exceed browser memory or take a long time. If conversion fails, try a smaller file or a desktop converter.