Yes! Convert999 works on any device with a web browser — iPhone, Android, iPad, or desktop. No app installation required. Simply open the converter, upload your MP4 file, and download the converted MKV file.
Will I lose quality converting MP4 to MKV?
Convert999 uses high-quality conversion algorithms to minimize quality loss. For lossless formats, the conversion is exact. For lossy formats like images and audio, we use optimized settings that balance quality and file size.
Can I batch convert multiple MP4 files to MKV?
Yes, Convert999 supports batch conversion. Select or drag & drop multiple MP4 files and convert them all to MKV format at once. Each file is processed locally in your browser.
What is the difference between MP4 and MKV?
MPEG-4 Video (MP4) and Matroska Video (MKV) differ in compression, compatibility, and features. MP4 is optimized for its native use cases, while MKV may offer different advantages. Visit our MP4 vs MKV comparison page for a detailed breakdown.
Why Convert MP4 to MKV?
Advantages
✓Matroska Video offers better compatibility with modern applications and workflows
✓Converting is completely free with no file size limits on Convert999
✓Your files never leave your device — 100% private and secure conversion
✓Instant conversion without waiting for server processing
Key Differences
→MP4 (MPEG-4 Video) is optimized for its native use cases
→MKV (Matroska Video) may offer different compression or feature set
→Choose based on your target platform, quality needs, and file size requirements