MKV to MP4 Converter
Haikit converts MKV video to MP4 in your browser, for free. Add your video, choose the quality, and download the MP4. MKV files often will not play on phones, TVs and editing software, but MP4 will.
Drop a video here
MP4, MOV, MKV, WebM, AVI and more. Files up to 50 MB.
You can also paste with Ctrl+V.
Your files are converted on your device and are never uploaded.
How to use MKV to MP4
- 1
Add your MKV video. Files up to 50 MB are free.
- 2
MP4 is already selected. Choose a resolution and quality if you want a smaller file.
- 3
Click Convert and download the result. Larger videos take longer, because the work happens on your device.
What is free and what is paid
Free, no sign-up
- Convert one video at a time to MP4, MOV, MKV, WebM, AVI or GIF
- Choose the resolution and quality
- Make a video smaller
- Files up to 50 MB
Questions
Why won't my MKV video play on my phone or TV?
Many phones, TVs and editors do not support the MKV container. Converting to MP4 with H.264 video and AAC audio makes the video play almost anywhere.
Is MKV to MP4 free?
Yes. You can convert one video at a time, up to 50 MB, for free with no sign-up. Paid plans convert up to 10 videos at once and handle files up to 300 MB.
Are my files uploaded?
No. The conversion runs inside your browser, so your file never leaves your device. The converter itself downloads once (about 30 MB) and your browser keeps it for next time.
Do I need to install anything?
No. Haikit works in the browser on Windows, Mac, Linux, iPhone and Android. There is nothing to download or install.
Updated October 2026