MKV to MP4 Converter - For Phones & Browsers

Convert MKV to MP4 for universal compatibility. Make high-quality videos play on smart TVs, phones, tablets. Browser-based, private, no uploads.

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Drop MKV file here or click to browse

Also supports other video formats

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All processing happens in your browser using FFmpeg WebAssembly. Your videos never leave your device—completely private and secure.

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Frequently Asked Questions

MKV (Matroska) is a powerful open-source container that supports multiple video tracks, audio tracks, subtitle streams, and chapter markers. While excellent for archiving, MKV has limited device support. Most smart TVs, streaming sticks, game consoles, and mobile devices don't play MKV natively. Converting to MP4 gives you universal compatibility without sacrificing quality.

MKV files are created by video downloaders, Blu-ray rippers (MakeMKV, HandBrake), screen recorders (OBS Studio), anime/movie downloads, and streaming capture tools. MKV is the preferred format for high-quality video archives because it preserves everything—multiple audio tracks, subtitles, chapter markers—without file size bloat.

Most smart TVs, Roku, Fire TV, and Chromecast have limited or no MKV support. The issue is complexity: MKV can contain any codec combination, and device manufacturers don't include decoders for all possibilities. MP4 with H.264 is universally supported because it's standardized and hardware-accelerated on virtually every device.

If your MKV contains H.264 video, conversion can be nearly lossless at 'High Quality' or 'Best Quality' settings—the same codec, just a different container. If your MKV uses other codecs (VP9, AV1, HEVC), some re-encoding occurs, but quality loss is typically imperceptible at default settings. You gain massive compatibility with minimal quality trade-off.

Conversion is slower than playback—a 10-minute video might take 15-45 minutes depending on your device. Desktop computers convert faster than laptops, which convert faster than phones. Higher quality settings and larger resolutions (4K) increase processing time. For frequent conversions or large files, desktop software like HandBrake offers better performance.

Embedded subtitle tracks are not automatically included in MP4 output. If you need subtitles, you'll need to either hardcode them (burn into video) using a subtitle tool first, or keep the subtitle files separate (.srt) and use a video player that supports external subtitles. Most MKV files contain soft subtitles that won't transfer to MP4 without special processing.

This tool converts the primary (first) audio track only. MKV files often contain multiple audio tracks—different languages, commentary tracks, or surround sound variants. MP4 technically supports multiple audio tracks, but this browser-based converter uses the default track. For advanced multi-track preservation, use desktop software like HandBrake.

For movie files you want to archive, use 'Best Quality' for near-lossless conversion. For everyday viewing, 'High Quality' provides excellent results with reasonable file sizes. If storage space is limited or you're sharing via messaging apps, 'Smaller File' maintains good quality at significantly reduced sizes.

No, never. All conversion happens entirely in your browser using FFmpeg WebAssembly. Your video files stay completely private on your device and are never transmitted anywhere. You can even use this tool offline after the initial page load. Perfect for movies, personal videos, or sensitive content.

MKV supports everything needed for high-quality distribution: multiple video tracks (different versions), multiple audio tracks (languages, commentary), unlimited subtitle streams (all languages), chapter markers, and metadata—all in one file. It's also open-source and royalty-free. For playback on common devices, converting to MP4 provides the same visual quality with better compatibility.

MKV to MP4 Converter - For Phones & Browsers

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