Generate a pure audio tone at any frequency, online and free. Pick a waveform, set the Hz, and press play.
Frequency
Waveform
Volume
60%Set a frequency and press Play to hear a steady tone. Lower the volume before switching to square or sawtooth waves.
This free online tone generator plays a clean, steady tone at any frequency from 20 Hz to 20 kHz. Type a frequency or drag the slider, pick a waveform, sine, square, sawtooth, or triangle, and press play. It shows the nearest musical note and how many cents you are off, so you can test speakers and headphones, check your hearing, or tune an instrument by ear. Everything runs in your browser, no app, no sign-up, nothing to install.
Generate a precise audio tone in three steps, no account needed.
Type a value in hertz or drag the slider anywhere from 20 Hz to 20 kHz. Use the nudge buttons for fine ±1 Hz steps or jump a full octave.
Choose sine for a pure tone, or square, sawtooth, and triangle for richer harmonics, then set a comfortable volume.
Hit play to hear the tone instantly. It keeps sounding steadily and updates live as you change frequency, waveform, or volume.
Exact frequency control, four waveforms, and a note readout, all online and free.
Dial in any frequency to the hertz with the slider, the number input, or ±1 Hz and octave buttons for fine adjustments.
Sine gives a pure test tone; square, sawtooth, and triangle add harmonics for testing, synthesis, and ear training.
Every frequency shows its nearest note and the cents offset, so you can match a pitch or check tuning by the numbers.
Use the steady tone to test speakers and headphones, check your hearing range, or tune an instrument by ear.
One simple tool for testing audio, training ears, and exploring sound.
Send a reference tone to test gear, cabling, and signal paths.
Sweep frequencies to find rattles, buzzes, and dead spots.
Confirm left/right channels and check low and high response.
Find the highest frequency you can still hear.
Generate a reference pitch to tune an instrument by ear.
Start from a clean waveform when building synth patches.
Demonstrate frequency, pitch, and waveforms in acoustics class.
Use test tones to set up and calibrate your speakers.
Find a frequency that matches a tone you hear, for reference.
Accurate frequencies, instant playback, and nothing to install.
A steady, known tone is the fastest way to check speakers, headphones, channels, and room response without lab equipment.
Match an instrument to a reference frequency, or train your ear to recognize pitches and intervals with a clean sine tone.
Set a frequency to the hertz and hear it immediately, right in your browser, no app, no plugin, no sign-up.
“I pull up this tone generator on my phone to ring out a PA and check monitors. Type the frequency, hit play, done, no need to carry a signal generator anymore.”
“Perfect for class. I show students a 440 Hz sine wave, switch to a square wave, and they instantly hear what harmonics do. The note and cents readout makes it click.”
“I use it to test my monitors and headphones in a new room and to grab a clean reference tone. Free, accurate, and it runs right in the browser.”
Need to tune up instead? Try the free Online Tuner. Or turn your ideas into a complete song with our AI Music Generator, no studio required.
