Free MKV to MP4 Converter
Convert MKV to MP4 for free in your browser. Fix playback failures on Samsung Smart TVs, LG webOS, Sony Bravia, PlayStation 4/5, Xbox, and Windows Media Player. Works on Handbrake rips and scene downloads. No upload required.
Why MKV files fail to play — and where this matters most
MKV (Matroska Video) is the most common container format for high-quality rips from Blu-ray and DVD, and for files distributed via torrents and scene groups. The problem is that MKV is a container, not a codec — it can hold virtually any video and audio streams inside it. Most Smart TVs, game consoles, and streaming devices have a short list of supported containers hardcoded in firmware. Samsung Tizen TVs, LG webOS, Sony Bravia Google TV, and Hisense VIDAA will play MP4 and often MOV, but many firmware versions do not support MKV over USB or DLNA. PlayStation 4 and PlayStation 5 support MP4 and AVI via USB Media Player, but MKV is not on the official supported formats list. Xbox One and Xbox Series X|S support MKV in the Windows 11 Movies & TV app only if the appropriate codecs are installed via the Microsoft Store. Windows Media Player (WMP) on Windows 10 and earlier does not natively read MKV. Converting to MP4 eliminates all of these device-specific blockers because H.264 video in an MP4 container is the single most universally supported video format in existence.
What actually changes when you convert MKV to MP4
MKV and MP4 are both container formats — they wrap video streams, audio streams, subtitles, and chapter data in a structured file. When a Handbrake rip or a downloaded MKV contains H.264 video with AAC audio, the video and audio data itself is identical to what goes into an MP4. The only thing changing is the outer container. In a true remux scenario, FFmpeg would simply copy the streams without re-encoding. However, Konverton re-encodes using FFmpeg WebAssembly to ensure the output MP4 conforms to baseline playback profiles that all devices support. This means a small quality reduction relative to a lossless remux, but the output will play on every device without compatibility errors. If your MKV contains HEVC (H.265) video, the converter re-encodes it to H.264 for maximum compatibility — HEVC is not supported by all Smart TVs and streaming sticks even in MP4 containers.
MKV features that do not carry over to MP4
MKV supports multiple audio tracks (Japanese and English dubs simultaneously), multiple subtitle tracks (SRT, ASS, PGS bitmap subtitles), chapter markers, and forced subtitles. MP4 supports a subset of these features: multiple audio tracks are supported in MP4 but most players only show the first one; SRT-style text subtitles can be embedded in MP4 using the TTXT/tx3g format, but PGS bitmap subtitles (common in Blu-ray rips) are not compatible. Chapter markers are preserved. If your MKV contains a specific audio track or subtitle language you need, note that the converter selects the first audio stream by default. For multi-track MKV files where track selection matters, a desktop tool like Handbrake or MKVToolNix gives you precise control over which streams to include.
Why Use Konverton for MKV to MP4 Conversion?
Format Conversion
Convert between MP4, WebM, AVI, MKV, MOV, and other video formats. Adjust video bitrate and quality for optimal results.
Quality Control
Adjust video bitrate from 500k to 8M for optimal quality and file size. Choose the perfect balance for your needs.
100% Private
All conversions happen in your browser. Your files never leave your device.
Batch Processing
Convert multiple video files at once with batch processing. Apply the same settings to all files for efficient workflow.
Technical Specifications
- Matroska container (open standard)
- Supports H.264, H.265, VP9, and most codecs
- Multiple audio/subtitle tracks
- Common for Handbrake rips and downloads
- H.264 video (maximum device compatibility)
- AAC audio (universally supported)
- Plays on Smart TVs, PS4/5, Xbox, iOS, Android
- Accepted by YouTube, Instagram, and TikTok