Online Tone Generator
Generate precise audio tones, binaural beats, frequency sweeps, noise, and musical chords. Free, browser-based, with real-time visualization and extensive presets.
What is a Tone Generator?
A tone generator creates audio signals at specific frequencies. This free online tool generates pure tones (20Hz-20kHz), binaural beats for meditation, frequency sweeps for testing, and various noise types. Simply select a mode, set your frequency, and press play.
Key Facts
- •Human hearing range: 20 Hz to 20,000 Hz
- •Standard tuning pitch: A4 = 440 Hz
- •Alternative tuning: A4 = 432 Hz
- •Binaural beats require headphones to work
- •White noise has equal energy at all frequencies
- •Pink noise has equal energy per octave
- •Brown noise emphasizes lower frequencies
Common Use Cases
How to Use
- 1
Select a Mode
Choose Pure Tone for single frequencies, Binaural for meditation beats, Sweep for audio testing, Noise for ambient sounds, or Chord for musical harmony.
- 2
Configure Settings
Adjust frequency, waveform, and volume. Use presets for common configurations or enter custom values for precise control.
- 3
Press Play
Click the play button or press spacebar. Watch the real-time visualization and adjust settings while listening.
Technical Specifications
- Frequency Range
- 1 Hz - 22,000 Hz
- Binaural Beat Range
- 0.5 Hz - 50 Hz beat frequency
- Waveforms
- Sine, Square, Triangle, Sawtooth, Custom harmonics
- Noise Types
- White, Pink, Brown/Red
- Sweep Types
- Linear, Logarithmic
- Chord Types
- Major, Minor, Diminished, Augmented, 7th chords, Suspended
Frequently Asked Questions
What is a tone generator?▾
A tone generator is a tool that produces audio signals at specific frequencies. It can create pure sine waves, square waves, triangle waves, and other waveforms at frequencies ranging from 20Hz to 20kHz (the range of human hearing). Tone generators are used for audio equipment testing, hearing tests, meditation, music production, and scientific applications.
What are binaural beats and how do they work?▾
Binaural beats occur when two slightly different frequencies are played in each ear through headphones. The brain perceives a third frequency equal to the difference. For example, 200Hz in the left ear and 210Hz in the right creates a perceived 10Hz beat. Different beat frequencies correspond to brainwave states: Delta (0.5-4Hz) for deep sleep, Theta (4-8Hz) for meditation, Alpha (8-12Hz) for relaxation, Beta (12-30Hz) for focus, and Gamma (30-50Hz) for peak awareness.
What's the difference between white, pink, and brown noise?▾
White noise contains equal energy at all frequencies (bright, hissing sound). Pink noise has equal energy per octave, with more bass (natural, like rain). Brown noise emphasizes low frequencies even more (deep, rumbling, like thunder). Each serves different purposes: white for masking sounds, pink for sleep, brown for deep relaxation.
How can I test my speakers or headphones?▾
Use the frequency sweep feature with the “Speaker Test” preset (100Hz-10kHz) or “Full Range” preset (20Hz-20kHz). Listen for frequencies that sound distorted, too quiet, or missing. Test stereo separation with the pan control. Check for rattling at low frequencies using bass sweep presets.
What are Solfeggio frequencies?▾
Solfeggio frequencies are specific tones believed by some to have healing or spiritual properties: 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, and 963 Hz. While scientific evidence for their benefits is limited, many use them for meditation. This generator includes all Solfeggio frequencies as presets.
Is 432 Hz better than 440 Hz?▾
432 Hz is an alternative tuning standard where A4 is tuned to 432 Hz instead of the modern standard 440 Hz. Some claim it sounds warmer or more natural, but there's no scientific consensus on benefits. It's a matter of personal preference. This generator lets you easily switch between both standards.
Related Audio Tools
This tool uses the Web Audio API and works in all modern browsers including Chrome, Firefox, Safari, and Edge. For the best experience, use headphones and ensure your browser has audio permissions enabled.