Choose an exact frequency
Enter any value from 20 Hz to 20 kHz or use presets for 60 Hz, 440 Hz, 1 kHz, and other common test tones.
Online Tone Generator
Generate precise sine, square, triangle, and sawtooth tones from 20 Hz to 20 kHz. Hear the signal, inspect its live spectrum, and download a WAV file.
Browser generatedLive spectrumWAV export
Ready440 HzA4
Channel
Start low. Pure tones and noise can be uncomfortable or damage hearing and equipment at high volume.
Live output spectrum20 Hz20 kHz
Press play to inspect the generated signal10% output
Signal, clearly explained
Generate with intent.
Use the controls above as a test source, then open the main analyzer when you want to inspect a recording or microphone input in more detail.
Open Spectrum AnalyzerUnderstand waveform harmonics
A sine wave contains one main frequency. Square, triangle, and sawtooth waves add different harmonic patterns that appear in the live spectrum.
Use tones safely
Begin at low output, especially with headphones. Browser volume is not a calibrated sound-pressure measurement.
Before you press play.
What frequency is concert A?
The common tuning reference A4 is 440 Hz, although some ensembles use a slightly different reference.
Why does a square wave show many peaks?
A square wave contains the fundamental plus odd harmonics. Those additional frequencies give it a brighter, buzzy sound.
Is the generated tone uploaded?
No. Playback and WAV creation happen locally with browser audio APIs.