Convert MKV files to MP4 instantly. Preserve subtitles, audio tracks & chapters. Free online converter with no quality loss.
Conversion settings — add a file to adjust
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.
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.
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.
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.
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.
| Device | MKV | MP4 |
|---|---|---|
| iPhone/iPad | No | Native |
| Android | Partial | Native |
| Windows PC | Partial | Native |
| Mac | Partial | Native |
| Smart TV | Partial | Native |
| Web Browser | No |
| Speed | Instant — MKV and MP4 share the same codecs, so we remux (copy streams) rather than re-encode. |
| Output size | Unchanged (measured 3.38 MB → 3.38 MB). |
| Quality | Lossless — no re-encode. |
| Engine | FFmpeg, server-side. |
Measured on our servers, June 2026, on a 10-second H.264/AAC MKV.
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 High Profile, AAC audio
Resolution: 1080x1920
Bitrate: 3.5 Mbps
Vertical 9:16, max 90 seconds
Resolution: 960x540
Bitrate: 1-2 Mbps
Max 16MB, keep under 3 minutes
Resolution: 1080x1920
Bitrate: 4-6 Mbps
Vertical, max 10 minutes
Resolution: 1920x1080
Bitrate: 5-8 Mbps
Max 512MB, max 2:20 minutes
Resolution: 1280x720
Bitrate: 2-4 Mbps
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.
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Fungerar overallt
| Native |
Max 25MB free, 100MB Nitro
Valfri webblasare, valfri enhet
| Funktion | MKV | MP4 |
|---|---|---|
| Fullstandigt namn | Matroska Video | MPEG-4 Part 14 |
| Filandelse | .mkv | .mp4 |
| Bast for | Multiple audio tracks | Universal compatibility |