MKV to MP4

MKV commonly carries several audio tracks and subtitle tracks. MP4 takes the first audio track only, and the subtitles do not come across.

Runs in your browser // nothing is uploaded

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What survives the conversion

Derived from what each format is able to store, not from what the conversion promises.

Kept

Audio track
Metadata
Chapters

Lost

Multiple tracks
Subtitle tracks

Settings used

H.264 at CRF 23, preset veryfast, first audio track to AAC.

When not to convert

Not if you need the alternate audio or subtitle tracks. MKV is the container that holds them.

About these formats

Video

What is a MP4 file?

MP4 is a container rather than a codec: it usually holds H.264 video with AAC audio, which is the single most widely playable combination on the internet. It supports subtitles, chapters and multiple audio tracks, and streams well because metadata can sit at the front of the file.

Read the format guide

Common questions

Does converting MKV to MP4 lose anything?

Yes. Multiple tracks, Subtitle tracks cannot be carried into MP4 and are dropped. MKV commonly carries several audio tracks and subtitle tracks. MP4 takes the first audio track only, and the subtitles do not come across.

Are my files uploaded when I convert MKV to MP4?

No. The conversion runs in your browser tab, so the file is never transmitted and the page works offline once loaded.

What settings does Filoven use for MKV to MP4?

H.264 at CRF 23, preset veryfast, first audio track to AAC.

When should I not convert MKV to MP4?

Not if you need the alternate audio or subtitle tracks. MKV is the container that holds them.