Tone & Signal Generator Online

A free tone generator with 4 waveforms (sine, square, triangle, sawtooth), multi-oscillator mixing, frequency sweep, DTMF phone keypad, noise generator, musical note presets, and WAV export. All in your browser.

How to Use

Select waveform

Choose sine, square, triangle, or sawtooth waveform type.

Set frequency

Use the slider or type a value from 1 Hz to 20,000 Hz.

Play the tone

Click Play to hear the generated tone through your speakers or headphones.

Export or use presets

Download the tone as a WAV file, or pick from musical notes and test frequency presets.

Create precise audio signals with waveform visualization and export

🎵Generator

🎹Multi

📊Sweep

⚡Presets

Frequency Hz A4

Volume 75% -2.5 dB

Start Hz

End Hz

Duration s

Sweep Type

Musical Notes

Test Frequencies

Noise

DTMF

⌨️ Space = Play/Stop

Features

4 waveforms: sine, square, triangle, sawtooth with real-time oscilloscope Multi-oscillator: mix 2-8 independent tones for chords and harmonics Frequency sweep: logarithmic or linear sweep across 1-20,000 Hz DTMF keypad, white/pink/brown noise, musical note presets, and audio export

FAQ

What frequency range is supported?

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

Can I play multiple tones at once?

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

What is a frequency sweep?

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.

What are DTMF tones?

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

Is this cryptographically generated?

No. Tone generation uses the Web Audio API OscillatorNode, which produces mathematically precise waveforms — not random data.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

How do you rate this tool?

4.5 (2 ratings)

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Who is this tool for?

Published 30 Mar 2026 Updated 21 May 2026