All formats
What is a MP3 file?
MP3 is the lossy audio format that made digital music portable, standardised as part of MPEG-1 in 1993. Newer codecs such as AAC and Opus sound better at the same bitrate, but nothing matches MP3 for sheer universality: it plays on essentially any device ever made.
At a glance
- Full name
- MPEG-1 Audio Layer III
- Extensions
- .mp3
- Type
- Audio
- Introduced
- 1993
- Created by
- Fraunhofer IIS and the MPEG working group
- Compression
- Lossy
- MIME type
- audio/mpeg
Strengths
- Plays on virtually every device and player in existence
- Small files at acceptable quality
- ID3 tags for title, artist and artwork are widely understood
Limitations
- Less efficient than AAC or Opus at the same bitrate
- Lossy, and re-encoding compounds the loss
- No native multichannel support in practice
When to use MP3
Use it when
Distributing audio that has to play anywhere without question: podcasts, voice recordings, music.
Avoid it when
Archiving or editing masters. Keep WAV or FLAC and export MP3 at the end.
MP3 conversions
Each page states what the target format cannot carry before you run it.
MP3 compared
Related audio formats
Last updated 2026-08-03