Video

The MP4 format

The most widespread video format in the world: phones, TVs, browsers and social networks all play it. It usually contains H.264 video and AAC audio, a pairing that gives good quality with compact files.

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Fact sheet

MP4

MPEG-4 Part 14

Best for: Sharing videos anywhere: chats, social media, email, websites.
Limits: Every lossy re-encode reduces the quality a little.
Type: video container
Typical codecs: H.264, H.265, AAC
Compatibility: universal
Extensions: .mp4
MIME type: video/mp4
Since: 2001

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Tools for MP4 files

Questions about the MP4 format

How do I open a MP4 file?

Usually a double click is enough: operating systems and the most common programs recognise it. If the program or website you use won’t accept it, you can convert it here to a more common format, for example WEBM.

What extension do MP4 files have?

.mp4. The MIME type is video/mp4.

Does converting a MP4 lose quality?

It depends on the target format: to lossless formats (PNG, FLAC, WAV) nothing is lost; to compressed formats (JPG, MP3, MP4) you can choose the quality to balance size and result.