Generate a pure test tone at any frequency with this free online tone generator. Choose a sine, square, triangle or sawtooth wave from 20 Hz to 20 kHz, preview it, and export a WAV — all in your browser, no signup.
Tone Generator
Generate a pure test tone at any frequency — sine, square, triangle or sawtooth. Preview it, then download a WAV. Handy for testing speakers, tuning, hearing checks and sound design.
A sine wave is a single pure frequency; square, triangle and sawtooth add harmonics for a richer or buzzier sound. Start at a low volume — high-frequency tones at full volume can be harsh and may stress small speakers or tweeters.
How to use the tone generator
- Pick a waveform — sine for a pure tone, or square/triangle/sawtooth for richer harmonics.
- Set the frequency — drag the slider or tap a preset (440 Hz A4, 1 kHz line-up, and more).
- Set duration and volume, press play to preview, then Download WAV.
What a tone generator is for
- Test speakers & headphones — sweep frequencies to check for rattles, buzzes or dead spots.
- Line-up & calibration — a 1 kHz reference tone is the standard for setting levels.
- Tuning — 440 Hz (A4) is the standard concert-pitch reference.
- Hearing checks & sound design — find your high-frequency limit or build sub-bass and sine sources.
Sine, square, triangle, sawtooth
A sine wave is a single pure frequency — the cleanest test tone. Square and sawtooth waves add strong harmonics for a buzzy, bright sound, while triangle sits in between. For speaker and hearing tests, use sine; for synth-style sources, try the others.
Free and private
The tone is generated on your device with the Web Audio API and exported as a clean WAV with no watermark, no signup and nothing uploaded. Start at a low volume — loud high-frequency tones can be harsh and stress small speakers.
Frequently asked questions
What frequency should I use to test speakers?
Sweep from about 20 Hz upward with a sine wave. Very low tones test the bass/sub response; 1–5 kHz is where the ear is most sensitive; above 15 kHz tests the highs (and your hearing).
What is a 1 kHz tone for?
1 kHz is the standard reference for lining up and calibrating audio levels across gear and software.
Is A4 440 Hz?
Yes — 440 Hz is the standard concert-pitch reference for the note A4, used for tuning instruments.
Does it work on mobile?
Yes, in any modern mobile browser.
Is it really free?
Completely — no signup, no watermark and no limits.