UtilityBaseDevice Tests
Online Tone Generator
Generate a pure tone at any frequency — sine, square, triangle, or sawtooth — with presets and a sweep.
Updated July 10, 2026
How to use the online tone generator
- 1Set a frequency with the slider, presets, or exact input.
- 2Pick a waveform — sine is the pure reference tone.
- 3Press Play, and adjust frequency or volume live.
- 4Use the sweep to glide between two frequencies.
Common uses
- Tuning an instrument to A4 440 Hz
- Testing speaker or headphone frequency response
- Checking the upper limit of your hearing
- Producing a clean reference or test tone
Frequently asked questions
What frequency should I use to tune an instrument?
Standard concert pitch is A4 = 440 Hz, which is the built-in preset most tuners reference. Some ensembles tune to 442 Hz; you can type any exact frequency into the box to match.
Can I test my hearing range with this?
Yes, roughly. Slowly raise the frequency and note where you stop hearing the tone — most adults lose sensitivity above 15–17 kHz. Keep the volume low, use headphones for consistency, and treat it as a fun check rather than a medical test.
Why does a pure tone sound harsh or loud?
A single-frequency sine wave concentrates all its energy at one pitch, so it can sound piercing even at modest volume, especially at high frequencies. Start quiet and raise the volume gradually to protect your hearing and speakers.
About this tool
The online tone generator produces a pure audio tone at any frequency you set, using your browser's Web Audio API — no app or plugin. Choose a sine, square, triangle, or sawtooth wave, drag the frequency slider or nudge it by 1 or 10 Hz, and use presets for common tones like 440 Hz (A4 tuning), a 1 kHz test tone, and high-frequency hearing checks. A sweep mode glides smoothly from one frequency to another over a set time. Use it to tune instruments, test speakers and headphones, or find the limits of your hearing. Everything runs locally on your device.
Like most tools on UtilityBase, the online tone generator runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more device tests here.
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