MKV to MP4 Converter

About this converter

MKV (Matroska) is a flexible container that can hold almost any video codec, several audio tracks, and multiple subtitle streams in one file. That makes it the favourite format for HD movies and TV rips - but it is also why MKV will not open in QuickTime, the iPhone Photos app, most smart TVs, or older versions of Premiere and Final Cut.

MP4 is the opposite: the most broadly supported video container in the world. Converting MKV to MP4 keeps your video but puts it in a wrapper that plays virtually everywhere.

Here is the part most converters will not tell you: if your MKV already contains MP4-friendly streams (H.264 or H.265 video with AAC audio, which most modern rips do), EasyConvert simply remuxes it - copying the existing streams into an MP4 container with zero quality loss, in seconds even on a multi-gigabyte file. Only when the streams are not MP4-compatible does it re-encode.

MKV to MP4: good to know

• Subtitles: MKV often carries soft subtitles (SRT/ASS). MP4 has limited subtitle support, so embedded subs may not carry over - keep the original .srt if you need them.
• Multiple audio tracks usually survive, but some players only read the first track, so the primary one is safest.
• Instant vs slow: instant means a remux (compatible streams); slower means a re-encode, only needed for unusual codecs.

How it works

1. Drop your file(s) in the box above (or click to browse).
2. Make sure MP4 is selected as the output.
3. Click Convert, then Download your file.

Frequently asked questions

How do I convert MKV to MP4?

Drop your MKV file in the box above, make sure MP4 is the output, and click Convert. When it finishes, click Download. Nothing is installed and nothing is uploaded.

Will converting MKV to MP4 reduce quality?

Usually not. If your MKV already uses H.264/H.265 video and AAC audio, EasyConvert copies the streams into MP4 without re-encoding, so the result is identical to the source. Quality only changes when the original codecs are not MP4-compatible and must be re-encoded.

Why does MKV to MP4 sometimes finish in seconds?

Because compatible files are remuxed, not re-encoded - the existing video and audio are repackaged as-is. Re-encoding, needed only for incompatible codecs, takes longer.

Do subtitles and multiple audio tracks survive?

Multiple audio tracks generally carry over, though some players only play the first. Soft subtitles embedded in the MKV may not transfer because MP4's subtitle support is limited - keep your .srt file if you need captions.

Is there a file-size limit?

Free conversions support files up to 1 GB, with 5 conversions per day. EasyConvert Pro ($5/month) removes both limits.

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