Tone & Frequency Generator
Generate pure tones at any frequency — test speakers, hearing and tuning.
Use headphones to test each ear independently.
⚠ Start low — high frequencies and full volume can damage hearing and speakers.
Why you’ll love Tone & Frequency Generator
Instant & free
No signup, no paywall, no limits — Tone & Frequency Generator works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Instant sound
Plays in real time in your browser via the Web Audio API — headphones recommended.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
About Tone & Frequency Generator
This tone generator synthesises a pure tone anywhere from 20 Hz to 20 kHz — the full span of healthy human hearing — straight from a Web Audio oscillator in your browser, with nothing to install. Frequency is pitch: 440 Hz is the A above middle C (concert-pitch "A4"), so the readout also shows the nearest musical note and how many cents sharp or flat you are, which makes it a quick tuning reference.
The waveform choice changes the timbre because of harmonic content. A sine wave is the pure fundamental with no overtones; a triangle adds faint odd harmonics; square and sawtooth waves are harmonically rich and sound buzzy or bright. That matters when you are testing gear: a sine is best for measuring a single frequency cleanly, while richer waves reveal how a speaker handles harmonics. You can route the tone to the left ear, right ear or both to check each channel independently.
Two built-in tests use the acoustics directly. The frequency sweep glides smoothly from a low to a high frequency (log or linear) and loops, which surfaces speaker rattles, room resonances and dead spots. The hearing-range test steps up through the highest frequencies and asks what you can still hear — most people lose the top end with age (presbycusis), so the highest tone you catch gives a rough hearing-age estimate. Start the volume low: high frequencies at full volume can harm both ears and speakers.
Popular uses
Frequently asked questions
They differ in harmonic content. A sine wave is a single pure frequency with no overtones, ideal for clean measurement and tuning. A triangle adds a little odd-harmonic colour; square and sawtooth waves pile on many harmonics, so they sound bright and buzzy and are useful for hearing how gear reproduces overtones.
High-frequency hearing naturally declines with age — a normal process called presbycusis. Many adults stop hearing above roughly 15–17 kHz, while teenagers can often catch 17–19 kHz. The hearing-range test walks up the top octaves and records the highest tone you confirm, giving a rough hearing-age estimate.
440 Hz is the international concert-pitch standard for the A above middle C, known as A4. Musicians tune to it, so this tool doubles as a tuning reference — the note name and cents readout tell you exactly how far any frequency sits from the nearest musical note.
Use the output-channel control to send the tone to just the left ear, just the right, or both. With headphones on you can confirm each earbud works and is wired to the correct side; on speakers it helps you find which channel is dead or out of phase.
It smoothly glides the tone from a start frequency to an end frequency over a set duration and loops. Sweeping is the fastest way to expose speaker or cabinet rattles, room resonances and frequency dead spots, because problems only show up at the specific pitch that excites them.
Tone & Frequency Generator is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
Browsers require a single tap before playing audio. After that first tap, everything works instantly.
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