Online Tone Generator — Hz & Frequency Generator

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No install · Works on your device<br>Play any tone from 1 Hz to 20,000 Hz right in your browser. Pick a pitch, choose a sound shape, and press play. This free hz generator and frequency generator works on any device, with nothing to download.

Hz

Pick a note

1 Hz100 Hz1 kHz20 kHz

Volume<br>50%

Balance<br>Center

Left<br>Center<br>Right

Waveform

Sine

Square

Sawtooth

Triangle

Turn your volume down before you press play. Some tones are far louder than they look, and can hurt your ears or your speakers.

Share

Play

Reset

Live waveform

idle

Popular frequencies

Play one, or stack several — each with its own volume and waveform.

Stop all

What is a tone generator?

A tone generator plays one clean sound at the pitch you choose. You type a number in hertz (Hz) and the tool plays that exact tone. It all happens inside your browser, so the sound starts the moment you press play. Nothing to download, nothing to set up.

You can play a low 40 Hz tone that you feel more than hear, a middle tone like 440 Hz, or a 15,000 Hz tone near the top of human hearing. Some people call this an hz generator ; others call it a frequency generator . Same thing.

Why people use one

Any pitch

Play anything from 1 Hz to 20,000 Hz. Type a number, or step it one hertz at a time.

Four sound shapes

Sine is the cleanest tone. Square, sawtooth and triangle sound fuller and sharper.

Left and right

Send the sound to one side or keep it centred, so you can test each speaker on its own.

Changes right away

Move a slider and the sound follows while it plays. No stopping and starting.

Easy to share

Copy a link that remembers your tone. Anyone who opens it hears the same thing.

Works on any device

Phone, tablet or computer — the tool behaves the same on all of them.

Ways to use it

Test speakers and headphones. Sweep through a few tones to find buzzing, rattles, or a side that plays quieter than the other.

Check your hearing. Raise the pitch slowly and notice where the tone disappears for you.

Tune an instrument. Hold a steady note and match your instrument to it by ear.

Ease ringing ears. Play a soft tone close to the ringing you hear. Keep the volume low.

Teach how sound works. Show pitch, waves and frequency with no extra equipment in the room.

Set up audio gear. Feed a known tone into a mixer or amp to set levels before a show.

How do you pick the right frequency?

Start with what you're trying to hear. Around 20 to 60 Hz is where subwoofers live, so that range shows up rattles in a car door or a loose speaker grille. The middle of the range, roughly 200 Hz to 2 kHz, is where voices sit, and it's the easiest place to judge whether two speakers are matched. Above 10 kHz you're testing tweeters and your own ears at the same time.

For tuning, 440 Hz is the standard A that most orchestras and apps use. Use the sine shape for anything you want to match by ear — the other shapes add extra tones on top and make pitch harder to judge.

What the sound shapes actually do

A sine wave is a single frequency and nothing else. It sounds smooth, almost hollow, and it's the right choice for testing and tuning.

Square, sawtooth and triangle waves stack extra frequencies on top of the one you picked. That's why they sound brighter or buzzier at the same number of hertz. Square waves are handy for hearing whether a speaker distorts; sawtooth is closer to a synth or a string sound; triangle sits in between and is gentler on the ears than square.

Common questions

What tones can I play?

Anything from 1 Hz to 20,000 Hz. Most people hear roughly 20 Hz to 20,000 Hz, and that range narrows with age. Small or cheap speakers often can't reproduce the very low or very high tones even though the tool is still sending them.

Is it safe to play loud tones?

Turn the volume down first, then bring it up slowly. This matters most with high tones and with headphones. Loud tones held for a long time can damage your hearing and your speakers. Stop if a sound feels sharp or painful.

Which waveform should I use?

Sine, unless you have a reason not to. It's the purest tone, so it gives you the clearest read on pitch and on how a speaker behaves. Square, sawtooth and triangle are better when you want a fuller, brighter sound.

Can I tune an instrument with this?

Yes. Pick the pitch you need — 440 Hz for a standard A — set the shape to sine, and match your instrument by ear. The note name under the number and the "Pick a note" button both help you land on the right pitch quickly.

Do I need an internet connection?

Only to open the page. After that the sound is made on your own device, so it keeps playing even if your connection drops.

Can I play more than one tone at once?

Yes. The popular frequencies list lets you stack up to eight tones together, each with its own volume and waveform. For full control over every tone, use the multiple tone generator.

Why does nothing happen when I press...