MP4→MKVConverter
Convert your MP4 files to MKV format instantly. Free, fast, and secure - your files never leave your browser.
↔ Convert MKV to MP4 insteadDrop file or click to browse
Max 100MB • Auto-deletes after 3 min
How to Convert MP4 to MKV
Upload Your File
Drag & drop your MP4 file or click to browse. Files up to 100MB are supported.
Convert
Click "Convert to MKV" and wait a few seconds for processing.
Download
Download your converted MKV file instantly. No registration needed.
Why Convert MP4 to MKV?
Converting MP4 to MKV can improve compatibility, enable editing in specific software, or optimize file size for your target platform.
About MP4 and MKV
What is MP4?
MP4 (MPEG-4 Part 14) is the most universally-supported video container format, compatible with virtually all devices, browsers, and platforms. It typically uses H.264 or H.265 video codecs.
What is MKV?
MKV (Matroska Video) is a flexible, open-standard container format that supports unlimited video, audio, subtitle, and metadata tracks in a single file.
Frequently Asked Questions
How do I convert MP4 to MKV?
Upload your MP4 file using the converter above, then click "Convert". Your file will be processed and you can download the converted MKV file immediately. The entire process takes just seconds.
Is it free to convert MP4 to MKV?
Yes, ModConvert is completely free to use. There are no hidden charges, no registration required, and no watermarks on your converted files.
Is my MP4 file safe when converting?
Absolutely. Your files are processed securely and are never stored permanently on our servers. Files are automatically cleaned up after conversion to protect your privacy.
What is the maximum file size for MP4 to MKV conversion?
You can convert MP4 files up to 100MB in size. This covers most common use cases for video files.
Can I convert multiple MP4 files at once?
Yes, you can upload and convert multiple MP4 files. Each file will be converted to MKV format individually for the best quality results.