Spectrogram

See sound as a frequency-over-time picture — FFT of an audio file rendered and downloadable as PNG.

Drop an audio file here, or

WAV / MP3 / M4A / OGG up to 200 MB. Decoded in this tab — never uploaded.

Everything runs in this browser.

How to use

  1. Drop an audio file.
  2. Pick the FFT window and frequency range.
  3. Render and download the PNG.

What it supports

Audio ≤ 200 MB decoded in-browser, PCM ≤ 256 MiB, ≤ 6,100 time columns. FFT 1024/2048/4096 with Hann windowing; linear frequency axis, dB color scale, full or partial range.

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