About us
About this tone generator
A precise, private audio tool that runs entirely in your browser.
What this site is
This site is a free online tone generator: a set of pages that play exact audio frequencies through your speakers or headphones. The main tool produces a single steady pitch from 1 Hz to 22 kHz with a choice of waveforms and stereo control, and companion pages layer multiple tones, glide through sweeps, and play paired binaural-style tones.
Everything is designed for quick, practical jobs — checking a speaker, tuning an instrument, training your ear, or demonstrating sound in a classroom — without installing software or creating an account.
How it works
All sound is synthesized locally on your device with the Web Audio API, the standard browser interface for audio. When you press play, the page creates an oscillator at your chosen frequency, routes it through volume, balance, and limiter stages, and sends it straight to your output. A visualizer reads the same signal to draw the waveform and spectrum you see.
Nothing you play is recorded, uploaded, or stored on any server. Your settings live in your own browser storage and in share-link addresses, so the tool remembers your last setup without ever learning who you are.
Who runs it
The site is operated by Tone Generator as an independent free tool, maintained alongside its companion generator pages. It carries no user accounts, no fake testimonials, no usage counters, and no awards — just the instruments, honest documentation, and a contact address.
Questions, corrections, and suggestions are welcome at any time through the contact page. Reports of wrong notes, broken players, or unclear explanations get priority, because accuracy is the whole point of a test-tone site.
Frequently asked questions
Is this tone generator really free?
Yes. Every tool and every tone on the site is free to use with no account, no install, and no usage limits. The site plans to cover costs with clearly labelled advertising in the future, which is why the privacy policy already describes ad cookies.
Do I need to install anything?
No. The generator runs entirely in a modern web browser with JavaScript enabled, on desktop and mobile alike. You can add the page to a phone home screen for an app-like full-screen experience without installing anything.