WHAT THIS TOOL DOES

This tool checks an audio file locally in the browser.

It reads the first bytes of the file and matches common audio container signatures.

No upload is required for signature checks or browser metadata decode.

Choose or drop an audio file on page 1, then press ANALYSE.

Page 2 shows the header bytes. Page 3 shows the detected format.

Use DECODE only when you also want duration, sample rate and channel count.

Many file formats start with known bytes.

WAV usually starts with RIFF and WAVE. OGG starts with OggS.

FLAC starts with fLaC, while many MP3 files start with ID3.

MP3 can be detected from ID3 metadata or frame sync bytes.

Some MP3 files have clear headers, while others are harder to identify.

That is why frame-sync MP3 detection may show medium confidence.

A container is not always the same thing as a codec.

OGG may contain Opus or Vorbis. WAV may contain PCM or other audio.

The detector identifies the file wrapper first, then decode metadata if supported.

The detector checks MP3, WAV, OGG, FLAC, AIFF, AIFC, M4A, MP4, AAC and ASF/WMA style headers.

Unknown means no known signature matched in the first bytes.

A corrupt, renamed or unsupported file may still show UNKNOWN.

Use CHOOSE on phones and tablets to pick files from storage.

Header analysis is quick. Decode metadata may take longer on large files.

Desktop browsers are best for very large or unusual audio files.

If type is unknown, the file may be corrupt, encrypted, renamed or unsupported.

If decode fails, the browser may lack codec support.

Try a desktop browser or convert the file to WAV for compatibility.