Audio File Inspector

This free audio file inspector shows the sample rate, bit depth, channels, duration and metadata of a WAV, AIFF, FLAC or MP3 file by reading its header in your browser, so the file is never uploaded.

What it reads

The tool reads only the header and metadata blocks of each file, never the whole audio, so even multi-gigabyte files open instantly. Values come straight from the file, not from your browser's audio engine, so the sample rate is the file's own and is never converted.

For WAV files it shows the format code, channel count, sample rate, bit depth, block alignment, bitrate, the speaker channel mask when there is one, the frame count and the chunks present. If the file has a Broadcast Wave bext chunk, it also shows the originator, the date and time and the time reference, which is the start position in samples since midnight that DAWs use to place the file on a timeline.

Questions

What is the difference between bit depth and container size?

A 24-bit file is often stored in a 32-bit container. The inspector shows the container size and, when the file states it, the number of valid bits.

Why does an MP3 duration say estimated?

An MP3 that has no frame count in its first frame is measured by assuming a constant bitrate, so a variable bitrate file without that header may be slightly off. An MP3 with a Xing or Info header gives an exact frame count.

Which formats are not supported?

M4A, AAC, Ogg, Opus and other formats are not read yet. MP3 layers I and II are recognised but not decoded for details.

Is anything uploaded?

No. The file is read locally by your browser and nothing is sent to the site.