MKV to MP4
- Step 1: Select your MKV video and upload it. Large files over 1 GB are welcome.
- Step 2: We start converting automatically. If your MKV already uses H.264 video and AAC audio, the process is lossless and very fast.
- Step 3: Download the MP4. If playback fails on your device, try Expert Settings with H.264 video and AAC audio.
Fast MKV to MP4 Converter
Pick a file and convert right in your browser - no software or extensions. If your tracks are MP4-compatible, it finishes in seconds. You’ll see live progress in the tab.
Lossless when your MKV is MP4 ready
Our online MKV to MP4 tool is fast and keeps the original quality whenever possible by avoiding re-encoding. If conversion is needed, we tune it to closely match the source - all in your browser.
Free to use
Converter App is free to use, with no sign-up, no watermarks, and no artificial limits beyond fair use.
No Hard Cap: Built for large MKVs over 1 GB
Upload large MKV videos - including files larger than 1 GB - with no fixed size limit on our side. Built for big uploads with clear in-browser progress. Start your next video as soon as this one finishes.
Want to tweak settings?
Choose H.264 encoding with an AAC codec for the best compatibility. Want smaller files? Try H.265 (HEVC) - just note some older devices won’t play it. VP9 is a great choice for the web.
Privacy first
Your files are processed securely and deleted automatically after conversion. We do not inspect your videos and we do not share them.
MKV to MP4 Online: Further Instructions
In most cases, the three steps above are enough for getting a great result with our MKV to MP4 online converter. If you want a specific video or audio codec for your MP4 output simply click on "Expert Settings" and choose the desired codec there. The available codecs are:
Audio Codecs
- AAC
- OPUS
- MP3
Video Codecs
- VP9
- H.264
- H.265
Choosing a codec by hand is only recommended if your target device cannot play the video created by our converter. Otherwise, the default settings give the best result. If you do not know which codecs to choose take: AAC/H.264.
Alternative Method: MKV to MP4 with VLC
Usually, an online converter is the best choice for your video conversion; If you want to do the conversion on your local computer, we also have an MKV to MP4 converter download recommendation for you: The VLC Media Player.
VLC is a free, open-source video player that can convert videos between different formats. The tool is available for MAC, Linux, and Windows; To convert MKV to MP4, VLC includes its own video converter. We assume here that you already have a VLC installation on your system:
1. Open VLC and click: Media and then Convert/Save in the drop-down menu.
2. In the dialogue click "Add" to select the MKV video you want to convert. You can add one or more videos.
3. Next, click the "Convert/Save" button.
4. Now select the profile "Video - H.264 + MP3 (MP3)" in the settings field.
5. After selecting the profile click browse to define an output file name and then "Start".
Video Tutorial
Our video tutorial above explains both approaches, the usage of our online video converter and VLC for converting MKV to MP4. The video is in English, and the explanations about VLC start at 1:20.
MKV vs. MP4
Both, MKV and MP4 are container formats for video and audio data and subtitles. The following table compares the most important features of both formats.
The MKV Format |
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| Name | Matroska video |
| Extension | .mkv |
| MIME Type(s) | video/x-matroska |
| Description | An MKV file is a video file saved in the Matroska multimedia container format. It supports several types of video and video codecs and may include SRT, SSA, USF (Universal Subtitle Format), or VobSub subtitles. MKV files are typically used for storing short video clips, TV shows, and movies. |
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The MP4 Format |
|
| Name | MPEG-4 Part 14 |
| Extension | .mp4 |
| MIME Type(s) | video/mp4 |
| Description | The MP4 file extension stands for the MPEG-4 video file format. MP4 is a very common video file format used for downloading and streaming videos across the internet. |
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MKV to MP4 converter quality rating
4.9 /
5 (based on
940 reviews
)