Free online tone generator

A tone generator produces a steady audio signal at one exact frequency, measured in hertz (Hz). This online tone generator is also an online frequency generator and frequency generator online: type any tone generator Hz value from 20 Hz to 20,000 Hz and hear that hertz sound instantly. A 440 Hz sine wave — the A above middle C — is the standard tuning reference orchestras use. Low tones like 60 Hz feel like a deep hum through a subwoofer, while high tones like 12,000 Hz sound like a thin whistle.

Unlike MP3 test files, this tool synthesizes every tone live with the Web Audio API. An oscillator node generates the waveform, a gain node controls the safety-capped volume, and a stereo panner routes sound left, right, or center. Because a hertz generator runs entirely on your device, there is zero streaming delay and zero privacy cost — no audio is recorded, nothing is uploaded, and there is no backend at all. It works on phone, tablet, laptop, and desktop, with no app store required.

Many frequency tools are cluttered with ads, require accounts, or lock sine waves behind paywalls. This tone generator free tool has no signup, no install, no watermark, and no per-day limit. As a pure frequency player, it starts playback the moment you press Play, bends pitch live as you drag, and syncs your frequency and waveform to the URL so any tone can be shared as a link such as ?freq=432&waveform=sine.

It is built for speed and honesty: a logarithmic slider that matches how pitch feels, a live oscilloscope that draws the real output, a left/right channel check for dead earbuds, one-tap preset chips from 20 Hz to 20 kHz, a musical-note picker across 88 notes, auto-stop timers, and client-side WAV export. Whether you call it a pitch generator, hertz generator, or frequency player, the job is the same — give you a trustworthy reference tone in under two seconds.

At its core this is a sine wave generator and pure tone generator. A sine wave contains a single frequency with no harmonics, so it sounds smooth and flute-like — the cleanest reference for speaker checks, earbud balance, and pitch matching. If you want the purest hertz sound, always start with sine.

Three extra waveforms turn the same pitch generator into a diagnostic kit. Triangle is a softer, mellower cousin of sine, easier on the ears during long sessions. Square is harsh and buzzy with strong odd harmonics, perfect for exposing distortion, testing alarms, and checking how small phone speakers handle stress. Sawtooth is bright and edgy with all harmonics, ideal for tweeter tests and synth calibration. Switch waveforms while playing — the oscillator morphs without restarting, and the oscilloscope shows the shape change live.

People open a frequency generator online for surprisingly practical reasons. The most common is the speaker and headphone check: play 100 Hz, 440 Hz, and 1 kHz in the left ear, then the right, to catch a dead earbud, a loose cable, or a blown driver. Bass lovers sweep 30–80 Hz to find the lowest note a subwoofer or soundbar reproduces without rattling, while producers hunt room buzzes and vibrating objects with slow sine tones.

Musicians use this pitch generator as a tuning fork that never wears out — dial 440 Hz for A4, 432 Hz for alternative tuning, or pick any note from A0 to C8 to tune guitars, pianos, and synths by ear. Teachers demonstrate octaves, harmonics, and logarithmic hearing with it; testers verify microphone chains, video-call audio, and hearing-aid feedback; meditators layer low drones for focus and relaxation. It confirms a pitch plays through your gear — it is not a calibrated meter and never a medical hearing test.

A single tone answers simple questions, but stacked tones reveal beats, distortion, and room problems one tone hides. Our dedicated multi tone generator layers up to four simultaneous frequencies with independent waveform, volume, and pan — try 440 Hz plus 442 Hz to hear a slow 2 Hz pulsing beat, or 220, 277, and 330 Hz for a detuned chord idea.

For full-range testing, the frequency sweep generator glides from any start hertz to any end hertz over a set duration, linear or logarithmic. A 20 Hz to 20 kHz logarithmic sweep is the classic speaker and room response check: listen for volume dips, rattles, and the points where bass or treble fades. Headphone listeners can also explore the binaural beats generator — two close frequencies, one per ear — as a novelty relaxation toy.

Prefer an app feel? This tone generator app experience needs no app-store tone generator download. It is a lightweight web app: open it in Chrome, Safari, Edge, or Firefox, tap “Add to Home Screen” or “Install,” and it launches full-screen like a native tone generator app while staying under a megabyte. Because synthesis is local, it even keeps working through short connection drops once loaded.

When you need an actual audio file, tone generator download is one click: the “Download 10s WAV” button renders a 10-second, 44.1 kHz stereo WAV of your exact frequency and waveform on-device and saves it as tone-440hz-sine-10s.wav. Use downloads for video editing, ringtones, alarm testing, classroom demos, or playing tones on speakers without a browser. Sharing is equally easy — every setting lives in the URL, so copying the link shares your exact test.

Not sure which tone generator Hz value to try? Human hearing spans roughly 20 Hz to 20,000 Hz, but most music lives between 40 Hz and 8,000 Hz. Start low, raise volume slowly, and keep high hertz sound exposure brief.

Tip: test 440 Hz first to set a comfortable level, then explore outward. If a frequency suddenly sounds much quieter, you have likely found your speaker’s roll-off — not a hearing result. Learn more about this project on the about page.