The ear is good at detecting that something sounds wrong, but terrible at diagnosing why. A spectrum visualizer turns sound into something you can look at, which makes obvious problems that are hard to pin down by ear alone — like knowing whether a recording is saturated or which frequency range dominates a mix.
Two ways to look at the same sound
Frequency bars: each bar represents the energy present in a specific frequency band, from bass (on the left) to treble (on the right), updating several times per second. It's the classic "visual equalizer" seen in music players. Internally it's computed with an FFT (Fast Fourier Transform), which breaks the audio signal down into its component frequencies.
Waveform: shows the signal's amplitude directly over time, exactly as it comes from the microphone or file, without breaking it down into frequencies. It's the classic view in any audio editor.
How to spot clipping at a glance
Clipping happens when an audio signal exceeds the maximum volume the system can represent and the wave gets "chopped off" instead of following its natural shape. In the waveform view, this looks like a signal that flattens abruptly at the top and bottom instead of curving smoothly — as if the tips of the waves had been sliced off. If you see that constant flattening in a recording, there's audible distortion, even if it's sometimes hard to identify by ear alone.
What the frequency bars tell you
- Activity concentrated on the left (bass): low end dominates — kick drum, low voices.
- Activity concentrated on the right (treble): cymbals, hiss, sibilant consonants in speech dominate.
- Bars that always max out in one specific zone: that frequency band is saturated or overrepresented — useful for spotting whether a voice recording has too much sibilance, for example.
- Total silence in a zone of the spectrum: can indicate an applied filter, a microphone with limited response, or simply that the frequency isn't present in the content.
Live microphone vs file
Besides analyzing a file, the tool can analyze the microphone in real time — useful for visually checking levels before recording, or for immediately spotting constant background noise at a specific frequency (electrical hum, for example, usually shows up as a fixed bar at a very specific spot in the spectrum).
Frequently asked questions
What's the difference between the bars and the waveform? The bars show which frequencies are present right now; the waveform shows the amplitude (loudness) of the whole signal over time, without splitting it by frequency.
Can I use the microphone without uploading a file? Yes, there's a dedicated mode for analyzing the live microphone.
Is audio or the microphone uploaded to a server? No, the analysis is done with the Web Audio API directly in your browser.
Can it tell me if an audio file has distortion? Yes, by checking the waveform: if the signal flattens instead of curving smoothly at the peaks, there's clipping.
Visualize any audio or your microphone in real time with the audio spectrum, in frequency bars or waveform mode.