Online tone generator
Free online tone generator. Play a precise sine, square, sawtooth or triangle wave from 50 Hz to 2 kHz — for speaker testing, cleaning, tuning and hearing checks.
Common frequencies and what they're for
| Frequency | Typical use |
|---|---|
| 165–230 Hz | Cleaning water, dust & lint from phone speakers |
| 440 Hz | Concert-pitch A — tuning instruments |
| 20–200 Hz | Bass / subwoofer testing |
| 1 kHz | Reference tone for level and speaker checks |
Each waveform has a different character: sine is pure and smooth, square and sawtooth are bright and buzzy (rich in harmonics), and triangle sits in between.
Frequently asked questions
What is a tone generator used for?
A tone generator plays a single, steady frequency. People use it to test speakers and headphones, clean dust or water from phone speakers, tune instruments, check the frequency range of audio gear, and run basic hearing checks.
What frequencies can it play?
Anything from 50 Hz (deep bass) up to 2,000 Hz (2 kHz). Use the presets for common values, or the slider for fine control. You can switch between sine, square, sawtooth and triangle waveforms.
Is it safe to play these tones?
Yes, at moderate volume. Avoid very high volumes for long periods, and do not hold the speaker directly against your ear. People with tinnitus or hearing sensitivity should keep the volume low.
Get the ultimate clean.
Everything on this site, plus haptic vibration, real-time volume diagnostics and background cleaning — free in the Speaker Wizard app for iPhone and Android.