Free online tone generator

What is an online tone generator?

An online tone generator is a web page that plays a steady musical or test pitch at any frequency you choose, measured in hertz (Hz). Instead of installing software or buying a signal generator box, you open the page, type a number, and press play. A frequency generator online like this one builds the sound live with the Web Audio API, so the pitch starts instantly and stays perfectly stable for as long as you need it.

This tone generator is a full online frequency generator: one oscillator produces the pitch, a visualizer shows the waveform and spectrum, and the note readout tells you which musical pitch you are hearing. Because it is a tone generator free of downloads, accounts, and installation steps, it works the same way on a laptop, a tablet, or a phone — a genuine tone generator free alternative to paid bench equipment for everyday checks.

How to use the tone generator in 3 steps

You can hear your first hertz sound in under ten seconds. The tool remembers your last settings, and every tone generator Hz value from 1 to 22000 is available by typing, slider, or musical note.

1. Set the frequency: type an exact value, drag the logarithmic slider, tap a quick chip, or pick a note and octave. The readout shows the nearest pitch and how many cents sharp or flat it is.
2. Choose a waveform and balance: sine is the default pure tone, and the Left, Both, and Right switch plus the pan slider send the sound to either ear or both for channel checks.
3. Press play at low volume: start quietly, raise the level slowly, and use the auto-stop timer if you want the tone to end by itself. Copy the link to share the exact setup, or download it as a WAV file.

Waveforms explained: sine, square, sawtooth and triangle

Every pitched sound on this page starts as one of four oscillator shapes, and the shape decides the timbre you hear. A sine wave generator produces a single smooth curve with no overtones, which is why sine is the standard choice for hearing checks, tuning, and calibration-style comparisons. When people ask for a pure tone generator, they mean exactly this: one frequency, nothing stacked on top.

The other three shapes add harmonics — whole-number multiples of the base frequency — which makes the same pitch sound brighter or harsher. Square waves sound hollow and buzzy, sawtooth waves sound bright and edgy, and triangle waves sit in between as a soft, mellow alternative to sine. If a 440 Hz tone sounds piercing on the square setting, switch back to sine: the pitch is identical, only the harmonic content changes.

• Sine: one pure frequency, no harmonics — best for testing and tuning.
• Triangle: gentle harmonics, softer and quieter-feeling than square.
• Square: strong odd harmonics, harsh and buzzy, cuts through noise.
• Sawtooth: full harmonic series, the brightest and most aggressive timbre.

Practical uses for a hertz generator

A hertz generator earns its place in a bookmarks bar because it replaces several single-purpose gadgets. Musicians tune to the built-in A4 reference, podcasters verify that both channels of an interface record correctly, teachers demonstrate vibration and pitch in class, and anyone unboxing earbuds can confirm the left and right sides match within seconds.

• Speaker and headphone test: sweep slowly from 40 Hz to 15 kHz and listen for rattles, dropouts, or one side going quiet.
• Left-right check: use the pan switch to send the tone to the left ear only, then the right, and compare loudness and clarity.
• Instrument tuning: dial in 440 Hz — or 432 Hz and 444 Hz references — and tune against the steady pitch.
• Ear training: quiz yourself on intervals by playing two pitches in sequence and naming the distance between them.
• Classroom demos: show how frequency, wavelength, and perceived pitch relate by moving the slider while the class listens.
• Relaxation and focus sessions: play a soft low tone, such as the 174 Hz area of the Solfeggio set, as a neutral background while you read or rest.

Hertz chart: what each range sounds like

Human hearing nominally spans 20 Hz to 20 kHz, but most adults hear a narrower band, and small laptop speakers reproduce a narrower band still. This short hertz chart maps frequency ranges to everyday descriptions so you know what to expect before you press play. The full Hz chart page expands every row with example tones you can audition.

Hertz generator vs pitch generator vs frequency player

These three names describe the same idea from different angles, and this page covers all of them. A hertz generator emphasizes the number: you type 1000 and get exactly 1000 cycles per second. A pitch generator emphasizes the ear: you pick A4 and hear a concert pitch you can tune to. A frequency player emphasizes playback: press play and the tone sounds for as long as you want.

Under the hood there is no difference — one oscillator, one frequency, one play button. Calling it a pitch generator makes sense for musicians, hertz generator for test-bench work, and frequency player for casual listening, but you never need three separate tools. One accurate page with a note readout serves every use case.

Download your tone and use it like an app

There is no tone generator download required to use this site, because the generator itself lives on the page. But when you need the sound somewhere else — a video edit, a test rig without internet, or a phone that should play a tone on stage — the WAV download button renders the exact current setup (frequency, waveform, pan, and level) into a standard audio file you can keep.

Prefer a tone generator app experience? Add this page to your home screen from the browser menu. It opens full-screen, works offline from cache after the first visit assets load, and costs nothing. You get app-like convenience with zero installs, zero updates, and zero permissions: the page never touches your microphone or your files.

Safe listening

Test tones deserve the same caution as loud music. High pitches can feel louder than their volume setting suggests, and long sessions at high levels can tire your ears. Start every session quietly, raise the level in small steps, and take the headphones off immediately if anything hurts, rings, or feels uncomfortable.

What this tool can and cannot do

This page is a precise everyday instrument: exact frequencies from 1 Hz to 22 kHz, four waveforms, stereo control, a level-capped output stage, timers, share links, and WAV export. The multi tone generator layers up to six pitches for beats and chords, and the frequency sweep generator glides smoothly between any two frequencies for response checks.

It is not a calibrated measurement device, not a hearing test, and not a medical device. Browser audio varies between devices, so results are screening-level only — useful for comparisons and quick checks, never a substitute for professional equipment or a qualified hearing professional. Read the disclaimer for the full details before relying on any result.