Sine
Pure · single frequency
Square
Buzzy · odd harmonics only
Sawtooth
Bright · all harmonics
Triangle
Mellow · odd harmonics
Free Online Tone Generator
Generate precise audio tones from 20Hz to 20kHz with multiple waveform shapes. Perfect for audio calibration, hearing tests, and sound design.
4 Waveform Types
Choose from sine, square, sawtooth, and triangle waves — each with a distinct harmonic profile suitable for different testing and creative applications.
Musical Note Presets
Instantly play standard musical notes (C4 through C5) for instrument tuning, ear training, and pitch reference — powered by precise Web Audio API synthesis.
Noise Generator
Generate white, pink, or brown noise for focus, masking background sounds, testing speaker response, or headphone burn-in — all processed locally in your browser.
When Should You
Use a Tone Generator?
Audio Equipment Calibration
Use specific reference frequencies (100Hz, 1kHz, 10kHz) to calibrate equalizers, verify amplifier linearity, and test DAC output accuracy.
Instrument Tuning
A4 = 440Hz provides the universal tuning standard. Use note presets for quick pitch reference without a dedicated tuner.
Tinnitus Frequency Matching
Use the frequency slider to identify and match the pitch of tinnitus — useful for audiologists when planning treatment.
Speaker Break-in & Testing
Use low-frequency tones to test subwoofer extension, mid-range for vocals, and pink noise for even driver break-in.
How It Works
Generate any frequency in seconds.
Set Frequency
Use the slider or type a precise value (20–20,000 Hz). Choose a waveform shape — sine for pure tones, square for buzzy textures, sawtooth for brightness, triangle for mellow warmth.
Adjust Volume
Set a comfortable listening level before playing. Start low and increase gradually, especially at extreme low or high frequencies where perception varies significantly.
Play & Analyze
Click Play to hear the tone in real-time. Use it to test speaker response, calibrate audio equipment, tune instruments, or identify your hearing range limits.
Common Use Cases
A precise tone generator has dozens of practical applications.
Audio Equipment Calibration
Use specific reference frequencies (100Hz, 1kHz, 10kHz) to calibrate equalizers, verify amplifier linearity, and test DAC output accuracy across the frequency spectrum.
Instrument Tuning
The A4 = 440Hz preset provides the universal tuning standard. Musicians can use other note presets for quick pitch reference without needing a dedicated tuner app.
Tinnitus Frequency Matching
People with tinnitus can use the frequency slider to identify the pitch of their tinnitus, which is useful information for audiologists when planning treatment strategies.
Speaker Break-in & Testing
Use low-frequency tones (20–80Hz) to test subwoofer extension, mid-range tones for vocal clarity assessment, and pink noise for even driver break-in across all frequencies.
Frequently Asked Questions
Q.What is the difference between sine, square, and sawtooth waves?
A sine wave is a pure tone with no harmonics. A square wave adds odd harmonics (3rd, 5th, 7th...) creating a hollow, buzzy sound. A sawtooth wave contains all harmonics, making it the brightest and most aggressive. Triangle waves are similar to sine but slightly richer.
Q.Why can't I hear very low or very high frequencies?
Human hearing typically ranges from 20Hz to 20kHz, but sensitivity varies by age and individual. Most people over 25 can't hear above 16-17kHz. Below 30Hz, many speakers simply can't reproduce the sound — you might feel vibrations but not hear a clear tone.
Q.What is white noise vs pink noise vs brown noise?
White noise has equal energy at all frequencies (sounds hissy). Pink noise has equal energy per octave (sounds more natural, emphasis on bass). Brown noise rolls off at 6dB/octave (deep, rumbling — popular for sleep and focus).
Q.Can I use this to tune my guitar or piano?
Yes. A4 = 440Hz is the standard tuning reference. Use the musical note presets to play any note from C4 (261.63Hz) to C5 (523.25Hz) as a pitch reference for your instrument.
Q.Is the tone generated locally or streamed?
All tones are generated locally in your browser using the Web Audio API. No audio is streamed from a server, so there's zero latency and your audio data never leaves your device.
Q.Can I damage my speakers with this tool?
At normal volumes, no. However, sustained high-volume playback of extreme low frequencies (below 30Hz) can push speaker drivers beyond their excursion limits. Always start at low volume and increase gradually.