Convert MKV to MP4 — Free Online Converter
Convert MKV files to MP4 instantly. Preserve subtitles, audio tracks & chapters. Free online converter with no quality loss....
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Supports: MKV files
Max: 100MB (free) · 2GB (Pro)
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How to Convert
Upload your .mkv file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mp4 file when it's ready.
About MKV to MP4 Conversion
MKV (Matroska) is beloved by video enthusiasts for its ability to store multiple audio tracks, subtitles, and chapters in a single file. However, this flexibility comes at the cost of compatibility—many devices and platforms struggle with MKV playback. Converting MKV to MP4 preserves your content while unlocking universal compatibility.
Our MKV to MP4 converter intelligently handles multi-track files, letting you select which audio and subtitle tracks to include. When your MKV already uses H.264 video, we perform a lossless remux that simply repackages the content in MP4 format—no quality loss whatsoever.
Why Convert MKV to MP4?
MKV files are common in video downloads, Blu-ray rips, and anime releases, but they frequently won't play on smart TVs, game consoles, or iOS devices. The "file not supported" error is frustrating when you just want to watch your content. Converting to MP4 eliminates these compatibility headaches.
MP4 is the universal language of digital video. Every smartphone, tablet, computer, smart TV, and streaming device plays MP4 without issues. Social media platforms, cloud storage services, and video hosting sites all accept MP4 natively. Your converted videos will work everywhere.
The conversion also simplifies multi-track files. MKV's support for 20+ audio tracks is overkill for most viewers. Our converter lets you extract just the tracks you need, creating a cleaner, smaller file that's easier to manage.
Common Use Cases
- Play MKV movies on smart TVs that only support MP4
- Watch anime with embedded subtitles on iOS devices
- Upload MKV content to video hosting platforms
- Stream MKV files to Chromecast or AirPlay devices
- Create smaller files by selecting specific audio tracks
- Fix MKV playback issues on PlayStation and Xbox
How It Works
For MKV files with H.264 video, we perform stream copy (remux) which preserves exact original quality in seconds. No re-encoding means no generation loss. The video bitstream is identical—only the container changes.
When re-encoding is necessary (for VP9, H.265/HEVC, or other codecs), we use high-quality x264 encoding with CRF 18-20. Audio tracks are converted to AAC 192kbps for compatibility, or you can keep the original audio with the "Preserve audio codec" option.
Subtitle handling offers three options: burn subtitles into the video (hardcoded), include as a selectable track (soft subtitles), or exclude entirely.
Quality & Performance
MKV to MP4 conversion is often completely lossless via remuxing. If your MKV uses H.264 video and AAC audio, the MP4 will be bit-for-bit identical to the source. Only files with incompatible codecs require transcoding, which our high-quality settings handle gracefully.
Don't let MKV compatibility issues stop you from enjoying your videos. Our converter transforms Matroska files into universally playable MP4s while preserving the quality and features you care about. Fast, free, and lossless when possible.