Convert MKV to MP4
Free, private, and entirely in your browser — no upload, no account, no watermark.
The converter opens with MP4 already chosen as the output. Just drop your MKV file and convert — nothing uploads.
How it works
Tap the button above — MP4 is pre-selected as the output format.
Your file stays on your device. Wait for the green “Engine ready” banner on first use.
Click Convert, then download your MP4 file straight to your device.
About MKV, and why convert to MP4
MKV (Matroska) is an open, flexible container that can hold almost anything — multiple audio tracks, subtitle tracks and chapters. It is popular for Blu-ray rips and downloads, and it is exactly what Apple devices, many TVs and browsers refuse to play.
Converting to MP4 keeps the video you actually watch and puts it in the container every device understands. The same film that would not open on an iPhone or in a browser plays everywhere as an MP4.
Quality guidance for this conversion
Balanced quality at Original resolution is the safe default: the video is re-encoded to H.264 and the audio to AAC, which every player supports. Do not expect the file to get dramatically smaller — MKV video is usually already well compressed — the win here is compatibility, not size.
Frequently asked questions
Will it play on my iPhone and TV after conversion?
Yes — that is the point. H.264 MP4 is the format Apple, Android, smart TVs and browsers all agree on.
What happens to extra audio and subtitle tracks?
The converter carries the video and audio. Extra tracks are not carried over, so if a subtitle track matters, extract it first with the Subtitle Toolkit.
Does conversion shrink the file?
Sometimes a little, sometimes not at all. MKV is already efficient, so think of this conversion as a compatibility fix, not a compression trick.
Is my file uploaded?
No. The whole conversion runs in your browser — a big MKV never leaves your device.