MKV to MP4 Converter
Convert MKV video to MP4 for playback on iPhone, Apple TV, and any device that rejects Matroska, free and entirely in your browser.
What is MKV?
MKV (Matroska) is an open, flexible container popular for ripped Blu-rays, downloaded shows, and files with multiple audio tracks, subtitle tracks, or chapters bundled together. It supports almost any codec but isn’t natively playable everywhere.
Why convert MKV to MP4?
MP4 has far broader native support — iOS, most smart TVs, game consoles, and social platforms play MP4 out of the box, while MKV often needs a dedicated player like VLC. Converting to MP4 trades some of MKV’s flexibility (multiple audio/subtitle tracks) for guaranteed playback anywhere.
How to convert MKV to MP4
- Drop your MKV file. Drag and drop a MKV file, or click to browse. First use loads the ffmpeg.wasm engine (~31 MB, cached in your browser after).
- Confirm output is MP4. This page pre-selects MP4 as the output format — change it in the format picker if you’d rather export something else.
- Set quality and convert. Pick a quality or bitrate preset, then click Convert. Processing runs locally on your device and typically finishes in well under a minute for short files.
- Download. Click Download to save your MP4 file. Nothing was ever uploaded to a server.
Your file never leaves your browser — conversion runs locally via ffmpeg.wasm, not on a server.
Use Cases
- Play a downloaded MKV episode on an iPhone, iPad, or Apple TV
- Upload an MKV rip to a platform that only accepts MP4
- Simplify a multi-track MKV into a single-audio MP4 for easy sharing