MP4 vs MKV: Which Video Format Should You Use?

If you spend any time working with video files, you have probably come across both MP4 and MKV. They are the two dominant video container formats, and each has a clear set of strengths. The right choice depends entirely on what you are trying to do with the video.

Quick Comparison

Feature	MP4	MKV
Compatibility	Works on everything	Limited on Apple/iOS
Multiple audio tracks	Limited	Excellent
Subtitle support	Basic	Full (SRT, ASS, SSA)
Chapter markers	Yes	Yes
File size	Same (depends on codec)	Same (depends on codec)
Streaming support	Excellent	Limited
Standard	ISO standard	Open source

When to Use MP4

• Sharing videos with anyone (it works everywhere)
• Uploading to social media, YouTube, or streaming platforms
• Playing on phones, tablets, and smart TVs
• Embedding video on websites

When to Use MKV

• Storing movies with multiple audio tracks (different languages)
• Keeping subtitle files embedded in the video
• Archiving video at maximum quality with all metadata
• Playing on a computer with VLC or similar capable players

The Bottom Line

For sharing and compatibility, MP4 wins. For archiving and flexibility, MKV wins. The good news is that converting between them is usually fast and lossless since both containers support the same codecs. You can use Filoshi's MKV to MP4 converter to switch between them in seconds.