Online utilities
Play a user-started test tone at an adjustable frequency, waveform and modest software gain.
Start with low device volume. Calculations and controls run in this browser tab.
An oscillator creates a periodic audio signal at the selected frequency in hertz. A 440 Hz sine wave repeats 440 times per second; square and sawtooth waves have stronger harmonics and may sound louder even at the same nominal gain. This tool uses the browser Web Audio API OscillatorNode and GainNode. It plays only after a user click, not automatically on page load.
The volume control caps software gain at 30% of full scale but cannot constrain an external speaker, amplifier or headphone setting. Begin with your device volume low. A frequency entered here is a requested oscillator frequency, not a certified acoustic output from your speakers. Sound cards, speakers, room acoustics and hearing sensitivity can all change what you actually hear.
Do not use a browser tone generator as a hearing test, medical instrument, calibrated acoustic standard or proof that equipment meets a specification. Very loud tones can harm hearing. The tool has a stop button and also stops when the page is hidden or settings change; if audio behaves unexpectedly, mute the device or close the tab.
Example: choose 440 Hz, sine and low volume, then press Play to hear a standard reference-frequency tone.
Use the sample inputs above to reproduce the example. Results display practical rounded values; real measurements and agreements can involve more uncertainty than the arithmetic.
Browsers require an explicit user action before starting audio.
A frequency of 440 oscillations per second.
No. It is not calibrated or medically validated.
They contain different harmonic components beyond the base frequency.
Last reviewed: November 1, 2026. Verify source conditions, local requirements, and product or contract terms before consequential decisions.
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