Yes, all UtilsHub tools are completely free. No registration, no hidden fees.

Do I need to sign up?

No, all tools work instantly without login or registration.

Do I need to download anything?

No, all tools run directly in your browser. No downloads required.

Yes, UtilsHub works on phones, tablets and computers. All tools are mobile-friendly.

Use Audio Spectrogram online for free, no download required. UtilsHub offers hundreds of fun online tools.

Decode audio and draw a spectral heatmap (x=time, y=frequency, color=intensity).

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Please choose an audio file.

Audio Spectrogram is a free online tool. Generate a spectrogram heatmap showing frequency over time.