How to Convert MKV to MP4 Without Losing Quality

MKV is a fantastic format for storing high-quality video with multiple audio tracks and subtitles. But try to play an MKV file on an iPhone, Apple TV, or most smart TVs, and you will run into problems. These devices want MP4.

Why MKV to MP4 is Usually Lossless

This is the part that surprises most people. MKV and MP4 are both containers. Think of them as different shaped boxes that hold the same stuff inside. If your MKV file contains H.264 or H.265 video (which most do), MP4 supports those same codecs.

When the codecs match, the conversion is called "remuxing." It copies the video and audio streams directly into the new container without touching the actual data. This means:

• Zero quality loss, bit-for-bit identical video and audio
• The conversion takes seconds, not minutes
• The output file is roughly the same size

How to Convert

1. Head to Filoshi's MKV to MP4 converter
2. Drop your MKV file onto the page
3. Click Convert
4. Download the MP4

What About Subtitles?

MKV files often have embedded subtitle tracks. When converting to MP4, soft subtitles (SRT, ASS) may be dropped because MP4 has limited subtitle support compared to MKV. If you need subtitles preserved, the Filoshi desktop app can handle this better by burning them into the video or extracting them as separate files.

When Re-encoding is Needed

If your MKV uses a codec that MP4 does not support well (like VP9), the converter will need to re-encode the video. This takes longer and introduces minimal quality loss, but Filoshi uses high-quality settings to keep the difference invisible to the eye.