See the frequency spectrum of any track — or plug in your mic for a live view.
How it works
Upload a file or use your microphone to see a real-time frequency spectrum from 20 Hz to 20 kHz. The dominant frequency is shown as the nearest musical note. Useful for checking what's happening in a mix, finding resonances in a room, or just seeing what a sound actually looks like.
A spectrum analyzer is the fastest way to see the tonal balance of a track: too much low end shows up as tall bars on the left, harsh treble as spikes on the right. Producers use it to spot a boomy resonant frequency, check that a mix translates, and find narrow problem bands to cut with an EQ. Musicians and AV techs use the nearest-note readout to tune instruments and to track down electrical hum or feedback frequencies.
Frequently asked
What am I looking at?
A breakdown of your audio by frequency — how loud each frequency is at any moment, from the lowest bass to the highest treble. Think of it as an X-ray of the sound.
Can I use my microphone?
Yes. Click "Use microphone" and grant permission. The analyzer shows the live spectrum of whatever the mic picks up — your voice, an instrument, a room.
What does the note name show?
The dominant frequency converted to the nearest musical note (standard A4 = 440 Hz tuning).
Why does the bass end take up more space on the screen?
The frequency axis is logarithmic — the same way human hearing works. Octaves appear as equal steps, so bass frequencies get more visual space.
Is my audio uploaded?
No. All processing happens locally in your browser. Microphone audio is never transmitted.
What do Peak dB, RMS and crest factor mean?
Peak dB is the loudest instantaneous sample, RMS is the average (perceived) loudness, and crest factor is the gap between them. A high crest factor (over 15 dB) means punchy, dynamic audio; a low one (under 6 dB) signals heavy compression or distortion. The clipping indicator lights up when the signal hits the digital maximum.
How do I find a room resonance or mains hum?
Play pink noise or a slow sine sweep through your speakers and watch for peaks that stick out — those are room resonances. A sharp spike at exactly 50 Hz or 60 Hz, plus its harmonics, is electrical mains hum picked up by your gear.
What do FFT size and smoothing do?
A larger FFT size (8192, 16384) gives finer frequency detail but reacts more slowly; a smaller one (2048) is faster but coarser — 4096 is a good default. Smoothing averages the display over time, so raise it for a calmer picture or lower it to catch fast transients.
How accurate is the frequency reading?
The peak is refined with parabolic interpolation between FFT bins, so a pure tone reads very close to its true frequency, and the note is shown with a cents offset (A4 = 440 Hz). For very low bass, raise the FFT size for more resolution.