Online Spectrum Analyzer – Real-Time Audio Frequency Analyzer
Real-time FFTReady
- Allow the mic in the address bar
- Choose the right input device
- Audio never leaves the tab
- Runs inside your browser
- No upload, no account
- Nothing saved after you close
Real-time audio spectrum analyzer
See which frequencies are present in a sound. Whistle, sing or play an instrument and watch the bars and the peak frequency.
How an FFT analyser works
A Fast Fourier Transform splits a short block of audio into frequency bins.
Finding hum and feedback
A steady peak at 50 or 60 Hz (and multiples) is mains hum.
Microphone limits
Laptop mics filter bass and apply processing; we turn off echo cancellation and noise suppression where the browser allows.
How to Use the
Spectrum Analyzer
- 01
Start
allow microphone access.
- 02
Make sound
speak, whistle or play a tone.
- 03
Read
bars show level per frequency band; the peak shows the strongest frequency.
- 04
Analyse
use it to find hum, feedback or resonances.
How an FFT analyser works
A Fast Fourier Transform splits a short block of audio into frequency bins. We use 2048 samples and logarithmic band grouping.
Finding hum and feedback
A steady peak at 50 or 60 Hz (and multiples) is mains hum. A sharp peak that grows during feedback shows the frequency to cut.
Microphone limits
Laptop mics filter bass and apply processing; we turn off echo cancellation and noise suppression where the browser allows.
Related guides and fixes
Learn more in these guides: Microphone not working, Microphone settings, Discord mic fixes, Decibel levels chart, What is LUFS.
Frequently Asked Questions
Q.Can it analyse system audio?
Only via a loopback device.
Q.Why no bars below 50 Hz?
Most built-in mics filter deep bass.
Q.Is it accurate?
Frequency is accurate; level is relative.