Spectrogram Viewer

See the frequencies in a sound over time as a spectrogram.

The frequencies within a sound

A spectrogram shows which frequencies are present in a sound and how they change over time, revealing the frequency content that a waveform does not. This displays a spectrogram in your browser, processed locally so nothing leaves your device.

Load audio or use your microphone to see a spectrogram.

Reading the frequency picture

Where a waveform shows loudness over time, a spectrogram shows a far richer picture: time runs along one axis, frequency up the other, and brightness or colour shows how strong each frequency is at each moment — so you can actually see the pitches and harmonics in a sound. This reveals things invisible in a waveform: the individual notes and overtones of music, the distinctive patterns of different sounds and voices, the frequency ranges different instruments occupy, and telltale signs like the harmonics that give a sound its character. Spectrograms are used across music, audio engineering, science and even fields like birdsong analysis and speech study, because they make the hidden frequency structure of sound visible. Watching a live spectrogram of your voice or an instrument is a fascinating way to see sound's inner structure — the fundamental pitch and the stack of harmonics above it that define its timbre. Processing in the browser keeps even private audio local, letting you explore the frequency content of any sound on your own device, turning the invisible spectrum of sound into a picture you can read.