Online Tone Generator
Pick a frequency, choose a waveform, and hear a clean, click-free tone while you watch its live waveform.
Tap a note to play its exact pitch — C1 to B8
Press Space to play
Popular frequencies
View all →Everything you need from a tone generator — and nothing you don’t.
Click-free playback
Smooth micro-fades on start and stop mean no pops — just a clean tone.
Precise to the hertz
Type any frequency from 1 Hz to 24 kHz, nudge it a hertz at a time, or glide the slider.
Four waveforms
Sine, square, triangle and sawtooth — switch live while a tone plays.
Live oscilloscope
Watch the exact waveform you’re hearing, drawn in real time.
Frequency sweep
Glide smoothly between two frequencies — once, looping or bouncing — to find resonances and test range.
Musical notes
Jump to any note from C1 to B8, or read the nearest note and cents for any frequency you play.
How to use it
Type a frequency or drag the slider. The nearest musical note shows underneath.
Choose a waveform and set the volume — start low to protect your hearing and speakers.
Press Play (or the spacebar). Adjust anything live; the tone updates without clicking.
What is an online tone generator?
An online tone generator is a small tool that plays a steady sound at any pitch you choose, right in your browser. Rather than installing an app or wiring up a signal box, you type a frequency in hertz, pick a waveform, and press play. This free online tone generator was built to do that one job properly — produce a clean, stable tone anywhere from 1 Hz to 24 kHz, with no clicks, no account, and nothing to install.
Behind the simple controls it is a genuine frequency generator. Your browser’s Web Audio engine synthesises the waveform in real time, so the pitch on screen is exactly the pitch you hear, accurate to the hertz. Everything runs on your own device, which means the tone generator responds the instant you move the slider or change waveforms, and none of your settings ever leave your computer.
Waveforms, sweeps and fine control
A capable tone generator tool offers more than one flat beep. You can switch between sine, square, triangle and sawtooth waves — from a pure tone generator sine wave with no harmonics at all, to the bright, buzzy edge of a sawtooth. Sine is the cleanest reference for tuning and testing; the richer shapes are handy when you want to hear how harmonics behave or push a speaker a little harder. Because you can change the waveform while a tone is still playing, comparing them is immediate — there’s no stopping and restarting.
The built-in frequency sweep generator glides smoothly from one frequency to another over a time you set, running once, looping, or bouncing back and forth. A sweep is the fastest way to find a room’s resonant peaks, check the usable range of a driver, or track down exactly where a rattle or buzz begins. With stereo balance and a live oscilloscope alongside it, this works as a full sound frequency generator rather than a novelty.
Who uses a frequency generator?
Musicians use a frequency tone generator to tune by ear against a fixed reference such as A = 440 Hz, or to check the intonation of an instrument. Audio engineers lean on a test tone generator to set levels, calibrate monitors and confirm that both channels are actually passing signal — a 1 kHz tone is the classic line-up reference, and sweeps reveal frequency response. For ear training, a fixed tone gives you a stable target to match your own pitch against.
It doubles as a high frequency generator for checking gear: play the top octaves and hear whether your tweeters, headphones or phone speaker really reproduce them, since many roll off well before 20 kHz. As an online frequency generator it is also useful for science lessons and hearing demonstrations — send a tone slowly upward and note where it vanishes, or compare two close pitches to hear them beat against each other. That makes it a practical tool for classrooms as well as workshops.
Free, private and instant
There is nothing to download and nothing to pay. This free online tone generator loads in about a second and works the same on desktop and mobile, so you effectively carry a sound frequency generator in your pocket. Begin with the volume low — high frequencies in particular can be louder and harder on your ears and speakers than they seem — then bring it up until the level feels comfortable.
Whether you need a quick pure tone generator for tuning, a test tone generator for calibration, or a frequency sweep generator for troubleshooting, the online tone generator on this page handles all of it. Bookmark it for next time, or copy a link that reopens your exact frequency, waveform and volume, and you’ll always have a dependable tone generator online whenever the moment calls for one.
Frequently asked questions
What is an online tone generator?
An online tone generator is a tool that plays a pure sound at a frequency you choose, straight from your web browser. This one uses the Web Audio API to synthesise the tone on your own device in real time, so it plays instantly with no download, no plugin and no account — you pick a frequency and waveform, press play, and hear a clean, steady tone.
How can I listen to different frequencies?
Type any frequency in hertz into the box, or drag the slider to glide smoothly through the range — the nearest musical note shows underneath as you move. You can also jump up or down by octaves, switch the waveform, or start a frequency sweep that travels automatically from one pitch to another. Everything updates live while the tone is playing, without any clicks.
Is it safe to use high frequencies?
For normal, comfortable listening it is fine, but a few sensible precautions help. Start with the volume low and raise it gradually, especially with high frequencies — they can be louder and more fatiguing than they seem, and can stress speakers and headphones. If you feel any discomfort, stop. This is a casual tool, not a medical device; if you have concerns about your hearing, see an audiologist.
What is a tone generator used for?
People use one to tune instruments to a reference pitch, calibrate and test audio equipment, check whether speakers or headphones reproduce a given frequency, and for ear training. Engineers use fixed tones such as 1 kHz to set levels; musicians match a note by ear; and a slowly rising tone is a simple way to explore the top of your hearing range. It is equally handy for science demonstrations and plain curiosity.
What frequency range can it play?
From 1 Hz up to 24 kHz. Most people hear roughly 20 Hz to 20 kHz, and the ear naturally loses the highest frequencies with age, so the very top of the range may be silent to you. Many speakers and earbuds also roll off before 20 kHz, so silence at the extremes can be the equipment rather than your ears.
Is the online tone generator free?
Yes — it is completely free, with no sign-up, no software to install and no ads interrupting playback. The tone is generated in your browser, so once the page has loaded it keeps working without any further downloads or cost.
Can I share an exact tone?
Yes. Set the frequency, waveform and volume, then press “Copy link”. The link encodes your settings, so anyone who opens it hears exactly the same tone — handy for sharing a reference pitch or a specific test tone with someone else.