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Tone Generator
Generate a pure test tone at any frequency from 20 Hz to 2 kHz with sine, square, triangle or sawtooth waveforms — for audio testing, tuning and hearing checks.
Frequency
440 Hz
⚠ Start at a low volume to protect your ears and speakers.
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
What can I use a tone generator for?＋
Testing speakers and headphones, tuning instruments, hearing checks and sound design — any pure frequency on demand.
Which waveforms are available?＋
Sine, square, triangle and sawtooth, each with its own timbre, via the Web Audio API.
Could it harm my ears or speakers?＋
Start at a low volume. Loud or very high-frequency tones can be uncomfortable and, at extremes, stress small speakers.