Convert MKV to MP4
Select Files
Audio, Video and Image supported. Drag or click
Select a MKV file, confirm MP4 as the destination and check the downloaded result. No account or installation is required; keep the original if quality or metadata matters.
How It Works
Select the source
Choose one or more MKV files from your device. Start with a small file when testing a new browser.
Confirm the destination
Confirm MP4 as the output. A quality slider is available only for image output in JPG, JPEG or WebP.
Download and check
Keep the tab open during processing, then save the completed MP4 file. Check it in the destination application.
About These Formats
MKV (Matroska) is the container of choice for high-quality video releases because it can hold virtually any codec plus multiple audio tracks, embedded subtitles, chapters, and metadata in a single file. The problem is that most consumer devices were never designed to read all of that: iPhones, iPads, Apple TV, Roku boxes, Chromecast, smart TVs, and HTML5 video players almost universally expect MP4. Converting MKV to MP4 collapses that rich structure into something every screen can play. If your MKV already carries H.264 or HEVC video and AAC audio, FFmpeg can swap the wrapper without re-encoding (a remux), preserving 100% of the visual quality and finishing the convert MKV to MP4 job in well under a minute even for full-length movies. When the source uses unsupported codecs like FLAC audio or HEVC 10-bit, a re-encode is needed; H.264 plus AAC is the universally safe target. WeLoveConvert runs FFmpeg in your browser via WebAssembly, so multi-gigabyte MKV libraries never get uploaded. Pick the single audio track you want to keep before exporting — MP4 supports one primary stream cleanly.
Frequently Asked Questions
How do I convert MKV to MP4?expand_more
Upload your files, confirm the conversion settings, and download your converted files. All processing happens in your browser — no server upload required.
Is this MKV to MP4 converter free?expand_more
Yes, completely free with no hidden fees. No sign-up required, no usage limits. All conversion happens in your browser.
Is it safe to convert MKV to MP4 online?expand_more
Your files never leave your device. All conversion happens locally in your browser using WebAssembly technology. We have zero access to your files.
Will I lose quality converting MKV to MP4?expand_more
Quality depends on the target format and your settings. Lossless formats like PNG preserve original quality. For lossy formats like JPG, you can adjust the quality slider.
Can I convert multiple MKV files at once?expand_more
Yes, you can convert multiple files at once. Simply drag all your files into the upload area or click to select them.
Common Issues
- infoMultiple audio tracks collapse to a single default track — alternate dubs and commentary streams are dropped.
- infoSoft subtitles (SRT, ASS) are usually lost or must be burned into the picture before export.
- infoFLAC and other lossless audio tracks must be re-encoded to AAC, introducing a small but real quality drop.
- infoChapter markers may not survive the rewrap, breaking long-form navigation in players that supported MKV chapters.