FFT spectrum analyser with peak hold, logarithmic frequency scale and selectable resolution. Drop an audio file or analyse mic input.
Drop a file, paste a URL, or use mic input.
Live magnitude vs. frequency, with peak hold.
FFT size, frequency scale and dB range — all adjustable.
Tradeoff between frequency resolution and update speed.
Catch transients you'd miss with smoothing alone.
Switch between perceptual log and engineering linear scales.
It decomposes the audio into its component frequencies and shows their magnitude — useful for spotting EQ imbalances, resonances or noise.
An envelope that 'remembers' the loudest value at each frequency over a short window — useful for spotting transient peaks.
Log scale matches human hearing (octaves are equally spaced). Linear is useful for engineering analysis at one specific band.
No — the mic stream stays in your browser. The FFT runs locally via Web Audio; nothing leaves your device.