Tone Generator
Generate audio tones at any frequency from 20 Hz to 20,000 Hz using the Web Audio API. Choose sine, square, sawtooth, or triangle waveforms. Adjust volume, use preset frequencies for tuning and testing, and play musical notes from C4 to C5. Free online tone generator for musicians, audio engineers, and hearing tests.
Works OfflineDark ModeNo Ads
Low-mid
Hz
20 Hz20,000 Hz
50%
0%50%100%
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- What is a tone generator?
- A tone generator produces audio signals at specific frequencies. This online tone generator uses the Web Audio API OscillatorNode to create precise tones from 20 Hz to 20,000 Hz — the full range of human hearing. It supports four waveform types (sine, square, sawtooth, triangle) with adjustable volume, making it useful for audio testing, instrument tuning, hearing tests, and sound design.
- What are the different waveform types?
- Sine waves produce a pure, smooth tone with a single frequency — the most natural sound. Square waves have a hollow, buzzy quality with odd harmonics, common in retro game audio. Sawtooth waves are bright and harsh with all harmonics present, often used in synthesizers. Triangle waves are softer and mellower, similar to sine but with a slight edge from odd harmonics.
- What is A4 (440 Hz)?
- A4 at 440 Hz is the international standard for concert pitch, adopted by the ISO in 1955. It means the note A above middle C vibrates at 440 cycles per second. Orchestras and instruments worldwide tune to this reference pitch. Some orchestras use slightly higher tuning (441-443 Hz) for a brighter sound.
- What frequency is middle C?
- Middle C (C4) has a frequency of approximately 261.63 Hz in standard tuning (A4 = 440 Hz). It is called "middle C" because it sits near the middle of the piano keyboard and between the treble and bass clefs in musical notation. It serves as a fundamental reference point in music theory and education.
- What is the human hearing range?
- The human hearing range is approximately 20 Hz to 20,000 Hz (20 kHz). Most adults can hear up to about 15-17 kHz, with high-frequency sensitivity declining with age (presbycusis). Bass frequencies below 80 Hz are often felt as much as heard. This tone generator covers the full audible spectrum.
- Can I use this for instrument tuning?
- Yes! Use the musical note reference (C4 to C5) to play specific notes for tuning instruments by ear. The A4 preset (440 Hz) is the standard tuning reference. Play a tone and adjust your instrument until the pitches match. For more precise tuning, consider using a dedicated chromatic tuner alongside this generator.