See a sound as an image
A spectrogram makes pitch visible — voices, bird calls, and hums drawn as frequency over time.
Tools used in this guide
The job
A waveform shows loudness; a spectrogram shows pitch. Each vertical column is an FFT of a short window — bright bands are energy at that frequency at that moment.
File plus window
Drop audio ≤ 200 MB. Pick the FFT size (larger = finer frequency, coarser time) and whether to show the full spectrum or the lower half where speech lives.
Worked example
A spoken sentence renders bright horizontal bands — vowels as stacked harmonics, sibilants as broadband noise above 4 kHz. A 50/60 Hz hum shows as a flat line at the bottom.
Where it stops
Decoded in-browser (WAV/MP3/M4A/OGG); ≤ 6,100 columns and the 256 MiB PCM budget cap long files — split hour-long audio first. Frequency axis is linear with a dB color scale. The PNG is a visualization, not spectral editing.