Tone & Signal Generator Online

1 Hz to 20,000 Hz. The slider uses a logarithmic scale for precise control across the entire audible spectrum.

Yes. Use the Multi tab to create up to 8 independent oscillators, each with its own frequency, waveform, and volume.

A sweep gradually changes frequency from a start point to an end point. Use it to test speakers, find resonance frequencies, or check hearing range.

DTMF (Dual-Tone Multi-Frequency) are the tones produced by phone keypads. Each key generates two simultaneous frequencies.

For testing rather than for listening, mostly — noise is what you reach for when you want to excite every frequency at once and see what a system does with it. White noise puts equal energy at every frequency and is the one to use for a raw sweep of a speaker or a room, because everything gets tested at the same level. Pink noise falls off with frequency in the way our hearing does, which is why it is the standard for setting levels by ear and for checking whether a room sounds even: pink noise that sounds tilted through your speakers means the system is tilted, not the noise. Brown is heavier still at the bottom and is used mostly as a masking sound rather than a measurement one.