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Audio Visualizer Bars - Online Live FFT Spectrum

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Frequently Asked Questions

This tool captures live audio from your microphone or an audio file and displays a real‑time FFT spectrum as animated bars. Each bar represents a frequency band, moving with the music intensity – perfect for understanding audio frequencies, making videos, or just having fun.

FFT (Fast Fourier Transform) converts the audio signal from the time domain into frequency domain. The AnalyserNode in Web Audio API splits the sound into many frequency bins, and we draw these as vertical bars – low frequencies on the left, high on the right.

Absolutely! This online spectrum visualizer runs entirely in your browser. No registration, no upload to any server – your privacy is protected.

Select “Microphone” source and click Start. Your browser will ask for microphone permission – allow it. The bars will instantly begin reacting to sounds around you or your voice.

We support formats your browser can decode natively, typically MP3, WAV, OGG, FLAC, AAC, and WebM. Upload a file and the visualizer will play it back while drawing the spectrum.

Make sure your microphone is connected and permission is granted. Also check that the input volume is not muted in your system settings. If you’re on a secure (HTTPS) site, browser policies allow microphone access; otherwise switch to a secure connection.

FFT size determines how many frequency bars are displayed and the frequency resolution. A larger value (e.g., 512) shows more detail in the high frequencies but may respond a bit slower. Smaller values (32–64) give a smoother, averaged look.

Yes. All processing happens locally in your browser using the Web Audio API. No audio data is ever recorded, stored, or sent to any server. Your microphone stream stays on your device.

Yes, the tool is fully responsive. On iOS Safari or Android Chrome, you can grant microphone permission directly. The canvas adjusts to your screen size for a great mobile experience.

Bars on the left represent bass (low frequencies, ~20–250 Hz), middle bars are midrange (vocals, guitars) and rightmost bars represent treble (hi‑hats, cymbals). The height shows the energy in that band – higher bar = louder sound at that frequency.
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