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Audio Format Inspector

See an audio file’s format, bitrate, length, tags and loudness.

MP3, WAV, M4A, FLAC, OGG, Opus, and videos

Drop another image anywhere on this page, or

Runs on your device. No upload wait.

What you get

  • The real format
  • Loudness in LUFS

Questions

Why does it say my .mp3 file is M4A?

The tool reads the file’s contents, not its name. Some apps save AAC audio with an .mp3 extension, and most players cope, but some devices refuse such files. The Audio Converter can turn it into a real MP3.

What do the loudness numbers mean?

Integrated loudness (in LUFS) is how loud the whole file sounds on average, weighted like human hearing (ITU-R BS.1770). Streaming services turn music down to about −14 LUFS. Peak is the highest sample; at 0 dBFS the file may be clipping.

Is the bitrate exact?

It’s the average the file declares or that its size and length give. Variable-bitrate files (VBR) change bitrate from moment to moment; the figure shown is their average.

Are my audio files uploaded anywhere?

No. Your audio files are opened and processed on your device, and the results are saved straight back to it. Nothing is uploaded. How to check.

Is it free? Do I need an account?

It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.

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