Audio Tools

Audio Spectrogram Viewer

See any recording as a waveform and a spectrogram, scrub along the timeline and read the frequencies at any point.

Runs in your browser. Files you open stay on your device and are never uploaded.

Zoom
Frequency scale

No audio open yet.

Open an audio file (or the sample) to see its spectrogram.

This is a visualisation of sound. Patterns in a spectrogram have ordinary acoustic causes such as speech, interference or background noise; it cannot detect ghosts or anything paranormal.

How to use it

  1. 1. Open an audio file from your device.
  2. 2. Read the waveform (loudness over time) and the spectrogram (frequencies over time).
  3. 3. Click anywhere to jump there; press play to follow the playhead.
  4. 4. Zoom in for detail and hover to read time and frequency.

What a spectrogram shows

A spectrogram draws sound as a picture: time runs left to right, pitch runs bottom to top, and brightness shows how loud each frequency is. Voices appear as stacked horizontal bands, footsteps as vertical strikes, hum as a steady line near the bottom. It is how audio engineers find noise, and how people examine recordings that seem to contain something odd.

The analysis runs entirely in your browser with a fast Fourier transform. This is a visualisation tool: patterns in a spectrogram have ordinary acoustic causes, and the viewer cannot detect ghosts or anything paranormal. It can show you what a sound is made of.

Questions

Can this detect ghosts or EVP?

No. It visualises the frequencies in a recording. Any pattern it shows has a physical cause such as speech, interference or background noise.

Is my audio uploaded?

No. The file is decoded and analysed on your device.

How long a file can I open?

Files up to about ten minutes work well; very long recordings take more memory to analyse.