MP4 to MKV Converter
Convert MP4 videos to MKV format online for free. No upload needed – runs 100% in your browser.
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How to Convert MP4 to MKV
Upload your MP4 file
Drag and drop or click to select a MP4 video file from your device.
Confirm MKV as output format
The output format is set to MKV. You can change it using the dropdown if needed.
Download your MKV file
Click Convert and wait for processing. Once done, download your new MKV video file instantly.
MP4 to MKV Use Cases
Play MP4 files on any device
"Convert MP4 videos to MKV format for universal playback on smartphones, tablets, and smart TVs."
Share MP4 videos online
"Convert MP4 to MKV for easier uploading to social media platforms and video hosting sites."
Edit MP4 in video software
"Convert MP4 files to MKV for compatibility with popular video editing applications."
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MP4 to MKV — Frequently Asked Questions
?How do I convert MP4 to MKV?
Simply upload your MP4 file, confirm MKV as the output format, and click Convert. The tool processes everything in your browser.
?Is the MP4 to MKV conversion free?
Yes, it is completely free with no sign-up, no watermarks, and no limits.
?Will converting MP4 to MKV lose quality?
We use high-quality encoding settings to preserve video quality during the MP4 to MKV conversion.
?How long does MP4 to MKV conversion take?
It depends on the file size. A typical 1-minute MP4 video converts to MKV in about 10-30 seconds.
?What is the maximum file size for MP4 to MKV?
There is no hard limit. Very large MP4 files (over 500MB) may take longer since processing happens in your browser.
?Is my MP4 file uploaded to a server?
No. Your MP4 file never leaves your device. All MP4 to MKV conversion happens locally using WebAssembly.
?Can I convert MKV back to MP4?
Yes! We support all combinations. Simply use our MKV to MP4 converter page.
?Does the MP4 to MKV converter work on mobile?
Yes, it works on any modern browser including Chrome, Safari, Firefox on both desktop and mobile devices.