Online Tone Generator
Generate pure audio tones at any frequency — free, instant, no install required
Frequency
Waveform
Musical Notes (Octave 4 & 5)
Frequency Presets
Use Cases
Music Tuning
Use A4 at 440 Hz as a reference pitch to tune guitars, pianos, and other instruments by ear.
Hearing Test
Sweep through the audible spectrum (20 Hz–20 kHz) to check which frequencies you can hear and detect any hearing loss.
Tinnitus Relief
Find the frequency matching your tinnitus to help mask or compare the ringing sound in your ears.
Speaker Testing
Test speaker and headphone response across frequency ranges to identify rattles, distortion, or rolloff issues.
Sound Physics
Visualize different waveforms and learn how frequency and waveform shape affects perceived sound quality and timbre.
Science & Education
Demonstrate sound resonance, acoustics principles, and auditory perception for classroom and science experiments.
Frequently Asked Questions
Common questions about tone generators and sound frequencies
What frequency range can humans hear?
The human auditory range is approximately 20 Hz to 20,000 Hz (20 kHz). This varies with age — children can often hear up to 20 kHz, while most adults begin to lose sensitivity above 15–16 kHz.
What is A4 = 440 Hz?
A4 (440 Hz) is the international standard concert pitch used to tune musical instruments. It's the A note above middle C and is recognized by ISO 16 as the universal reference pitch.
What is the difference between waveforms?
Sine waves are pure tones with no harmonics. Square waves have strong odd harmonics, creating a buzzy sound. Sawtooth waves contain all harmonics for a bright sound. Triangle waves have weaker harmonics, producing a softer tone.
Is it safe to listen to loud tones?
Prolonged exposure to loud sounds can damage hearing. Start with the volume low and increase gradually. Avoid listening at high volumes, especially at extreme frequencies like very low bass or high treble.
How is this tone generated?
This tool uses the Web Audio API built into modern browsers to synthesize tones directly on your device. No audio files are downloaded — the sound is generated in real time from a mathematical waveform.
Is any data collected?
No. All audio generation runs entirely in your browser. Nothing is recorded or sent to any server. Your microphone is never accessed by this tool.