Online Tone Generator

Generate pure tones online. Free frequency generator for audio testing, tinnitus relief, & sound engineering. Sine, Square, Sawtooth & Triangle waves.

Signal Generator

Pure Digital Synthesis

Frequency (Hz)

20Hz440Hz1kHz10kHz20kHz

Volume50%

Why Use an Online Tone Generator?

Our online tone generator is a versatile utility for musicians, engineers, and audio enthusiasts. It turns your browser into a precise signal generator capable of producing frequencies across the audible spectrum (20Hz - 20kHz).

Audio Testing

Use the sound frequency generator to test headphones, speakers, and subwoofers. A 20Hz-100Hz sweep is perfect for checking bass response, while pure sine waves reveal rattling enclosures.

Tinnitus Relief

Many sufferers find relief using a frequency generator online to match their tinnitus pitch (masking). This is often called "Neuromodulation" or sound therapy.

Understanding Waveforms

Different shapes create different sounds (timbres):

Sine Wave: The fundamental frequency with no harmonics. Smooth, clean, and piercing. Best for audio test tone usage.
Square Wave: Contains odd harmonics. Sounds hollow and buzzy, like 8-bit video game music.
Sawtooth Wave: Contains all harmonics. Sounds bright and sharp, often used in synth leads.
Triangle Wave: Like a sine wave but with some odd harmonics. Mellow but more defined than a sine.

How to Use This Pure Tone Generator

Caution: Turn your volume DOWN before starting. Pure tones can be perceived as much louder than music.
Select Frequency: Use the slider or input box. 440Hz is standard "A" note.
Press Play: The virtual tone generator will start immediately.
Sweep: Drag the slider while playing to perform a frequency sweep test.

How this Online Tone Generator works

This audio synthesis utility leverages the Web Audio API to generate pure, mathematically precise sound waves directly in the browser. It creates a continuous signal at a user-specified frequency (measured in Hertz), adjustable from the sub-bass range (20Hz) up to the limit of human hearing (20kHz).

Users can switch between four fundamental waveforms: Sine (pure energy, no harmonics), Square (odd harmonics, buzzy), Sawtooth (all harmonics, sharp), and Triangle (odd harmonics, mellow). This versatility makes it essential for testing audio equipment (checking for rattle or frequency response), tuning instruments, or even tinnitus management (matching internal ringing frequencies).

The generated audio is synthesized in real-time, ensuring zero latency and perfect pitch accuracy, providing a lab-grade signal generator without expensive hardware.

How to Use

Set Frequency

Adjust the slider or enter a value (e.g., 440Hz) for your tone.

Choose Wave

Select from Sine, Square, Sawtooth, or Triangle waveforms.

Play

Press the Play button to generate the continuous audio tone.

Example Usage

Standard reference tone for broadcast and audio calibration.

Input

Frequency: 1000Hz, Waveform: Sine

Output

Pure 1kHz Tone

Frequently Asked Questions

Is this frequency generator accurate?

Yes, it uses the Web Audio API which provides high-precision laboratory-grade timing and audio synthesis directly in your browser.

What is 440Hz?

440Hz is the standard tuning pitch (A4) used for musical instruments and audio equipment calibration.

Can I use this to test my hearing?

While you can use it to check what frequencies you can hear, it is not a substitute for a professional medical hearing test.

Which waveform is best for subwoofer testing?

Sine waves are best for testing speakers and subwoofers as they are pure tones without harmonics that could mask distortion.

Why can I not hear high frequencies?

Human hearing naturally degrades with age. Most adults cannot hear above 15kHz-17kHz, while children can often hear up to 20kHz.

Related Tools

The Online Tone Generator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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