Tone Generator

It works as a pitch pipe to tune by ear, as a note reference for singing or playing, to test speakers and headphones, for hearing tests, to find resonances, and to experiment with acoustics. It plays a pure, steady wave at the frequency you choose.

The sine wave is the purest and smoothest, ideal as a pitch pipe or hearing test. Square and sawtooth are brighter and richer in harmonics, useful to hear timbre or test gear. Triangle is in between.

Yes. You can set the reference tuning between 415 and 466 Hz. 440 Hz is the modern standard; 442 is used in many orchestras and 415 is Baroque pitch. When you change it, all notes are recalculated.

Always start with low volume and raise it gradually, especially with very low or very high frequencies. Loud pure tones can be uncomfortable and strain small speakers. Avoid long exposure at high volume.

Yes. Pick the note (for example A4 = 440 Hz or E for guitar), play it and tune your instrument or voice until it matches. You can leave the tone sustained while you adjust.

Yes, completely free, no sign-up, and it works right in the browser on desktop and mobile. It uses the Web Audio API, so you do not need to install anything.