Online Tone Generator
简繁EN
Tone GeneratorSweep GeneratorHeadphone TestTunerDecibel Meter
Online Tone GeneratorSTANDBY
ANALOG SIGNAL GENERATOR · CRT PHOSPHOR SCOPE · 20Hz - 22,000Hz
CRT OSCILLOSCOPE SCREEN · MODEL-74
440.0 HzSine
Level: 50% · Trigger: Auto
Timebase: 2.0 ms/div
OUTPUT LEVEL // VU
-20-10-5-10+3VU
ACTIVE CARRIER FREQUENCY
440.0Hz
COARSE FREQ: 440 Hz·FINE TUNE: 0 Hz
ANALOG RADIO SLIDE RULER DIALClick or drag red needle to tune
SUB-BASS
BASS
LOW-MID
MID-VOCAL
PRESENCE
BRILLIANCE
20
50
100
200
500
1k
2k
5k
10k
20k
20 Hz [Audible Low]CYCLES PER SECOND (HERTZ)20 kHz [Audible High]
COARSE FREQ
FINE TUNE
MASTER VOLUME
STATIC HISS
WAVEFORM
STATIC NOISE
CRACKLE
TUBE WARMTH
HARMONICS
Analog Sweep Generator
Current Carrier： 20 HzSweep Progress：0%
Start Frequency
Hz
Stop Frequency
Hz
Duration
sec
Quick Presets：
Acoustic Standard Presets
1 kHz Broadcast Alignment Tone
1000 Hz · Sine
The standard 1 kHz alignment reference used by television and radio broadcast systems.
Broadcast & TestLoad Preset →
440 Hz Concert Reference Pitch
440 Hz · Sine
The international tuning standard shared by orchestras, pianos and acoustic calibration.
Broadcast & TestLoad Preset →
432 Hz Natural Tuning
432 Hz · Sine
A classic reference pitch aligned with natural mathematical ratios, often used for meditation and deep relaxation.
Wellness FrequenciesLoad Preset →
528 Hz Solfeggio Transformation Tone
528 Hz · Sine
The core frequency of the ancient solfeggio scale, associated with cellular resonance and deep relaxation.
Wellness FrequenciesLoad Preset →
30 Hz Subwoofer Extension Test
30 Hz · Sine
A deep low-frequency pressure test for checking driver excursion limits and cabinet resonance.
Acoustics & BassLoad Preset →
60 Hz Mains Hum
60 Hz · Sawtooth
The mains hum and harmonic signature of vintage valve radios and classic guitar amplifiers.
Vintage RadioLoad Preset →
50 Hz European Mains Hum
50 Hz · Sawtooth
A warm, harmonically rich mains hum that recreates the character of classic European valve radios.
Vintage RadioLoad Preset →
Alpha Waves (432 Hz + 8 Hz beat)
432 Hz · Sine (+8 Hz)
Stereo binaural beat pulses associated with calm focus, clear thinking and stress relief.
Binaural BeatsLoad Preset →
Theta Waves (200 Hz + 4.5 Hz beat)
200 Hz · Sine (+4.5 Hz)
Deep meditation binaural beats used to induce subconscious relaxation and dreamlike ideation.
Binaural BeatsLoad Preset →
15 kHz High Frequency Test
15000 Hz · Sine
A high-frequency acoustic stimulus for testing treble extension and your hearing sensitivity.
Acoustics & BassLoad Preset →
Shortwave Static & 720 Hz Carrier
720 Hz · Triangle
AM broadcast static simulation that recreates the nostalgic sound of tuning a vacuum tube radio.
Vintage RadioLoad Preset →
220 Hz Retro Chip Square Wave
220 Hz · Square
A characterful analogue square wave rich in odd harmonics, suited to synthesizer tuning.
Broadcast & TestLoad Preset →

Online Tone Generator - Free Pure Tone & Binaural Beats

Binaural Beats

Binaural beats work by playing a slightly different frequency in each ear. Your brain perceives the difference as a single pulsing tone in the centre of your head, even though no speaker is actually moving at that rate.

How the difference tone works

When the left ear receives 432 Hz and the right ear receives 440 Hz, the difference is exactly 8 Hz. This 8 Hz beat is not present in either channel as sound. It emerges inside the auditory nerve, where signals from both ears are compared, and is heard as a slow throb. Because the effect depends on that comparison, binaural beats require headphones: a speaker playing both channels in one room cancels the effect through acoustic mixing.

Bands and the states they are associated with

Delta0.5 to 4 Hz
Deep sleep and physical restoration
Theta4 to 8 Hz
Meditation, deep relaxation and creativity
Alpha8 to 13 Hz
Calm focus and relaxed concentration
Beta13 to 30 Hz
Active attention and mental processing

How to set one up on this site

  1. Switch on the master power so audio starts.
  2. Set the carrier frequency to 432 Hz using the frequency dial.
  3. Turn on the binaural offset and set it to 8 Hz.
  4. Wear headphones, then adjust the master level to a comfortable volume.
  5. Expect to feel the pulse after a few seconds of listening.

The mapping between these bands and mental states comes largely from correlational studies, not clinical trials. Treat the effect as a tool for relaxation and focus rather than a medical intervention.

Acoustic Reference Guide

What Is an Online Tone Generator and How Does It Work?

An online tone generator synthesizes precise pure tones in real time with the Web Audio API. This guide explains how it works and how to use it for speaker calibration, audio testing and binaural beat experiments.

An audio tone generator is an indispensable instrument for electroacoustic calibration, sound system tuning, audiometry evaluation, and cognitive binaural beats. By synthesizing pure mathematical oscillators across the full human audible spectrum (20 Hz to 22,000 Hz), users can verify loudspeaker linearity, acoustic transducer distortion, room decay, and hearing thresholds with zero latency.

Four Classical Oscillator Waveforms

Sine (pure fundamental, 0% harmonic distortion), Triangle (soft odd harmonics), Square (classic hollow chiptune odd harmonics), and Sawtooth (full-spectrum rich bright harmonics).

Binaural Brainwave Entrainment

Generates micro-hertz stereo phase offsets between left and right channels to trigger neural frequency following responses (Alpha 8-12Hz, Theta 4-8Hz, Delta 0.5-4Hz).

Warm Vacuum Tube Emulation

Models non-linear hyperbolic tangent transfer curves of vintage 12AX7 triodes, delivering musical second-order even harmonics and gentle saturation compression.

Technical SpecificationsCALIBRATED AUDIO ENGINE
Synthesis Frequency Range20 Hz – 22,000 Hz (Continuous Logarithmic)
Tuning Step ResolutionCoarse 1 Hz, Fine Tune ±0.5 Hz
Total Harmonic Distortion (THD)< 0.002% (Pure Sine Reference Mode)
Master Export Architecture44.1 kHz 16-Bit Uncompressed Linear PCM WAV
Frequently Asked Questions

Standardized by ISO 16 in 1955 and the 1939 London Acoustic Conference, concert pitch A4 = 440 Hz harmonized diverse pitch drift across European halls and military brass bands, providing an absolute universal reference for instrument makers.

Key facts and specificationsQUOTABLE FIGURES
What frequency range does this tone generator cover?
20 Hz to 22,000 Hz continuous, adjustable logarithmically across the full span.
Which waveforms are available?
Four: sine wave, triangle wave, square wave and sawtooth wave.
What is the total harmonic distortion of the sine wave?
Below 0.002 percent in pure sine mode. Square and sawtooth waves intentionally contain odd harmonics and are not THD-measured.
What is the frequency resolution?
1 Hz coarse adjustment plus 0.5 Hz fine adjustment.
Can I export the audio?
Yes. Export is an uncompressed 44.1 kHz 16-bit linear PCM WAV file rendered in the browser.
Does the audio leave my device?
No. All synthesis happens in your browser using the Web Audio API. Nothing is uploaded.
Do I need to install anything or create an account?
No. The tool runs entirely in the browser with no signup, no download and no plugin.
How does binaural beat mode work here?
A small frequency offset is applied between the left and right channels, for example 432 Hz left and 440 Hz right produces an 8 Hz difference perceived as a pulsing beat.
ISO 16 / ISO 226 equal-loudness standardsIEC 61672-1 sound level meter specification
GEO SEMANTIC GRAPH // ENTITY INDEXED
Zero-Latency Tactile Feedback

Rotary knobs support vertical drag, circular angle tracking, mouse wheel rotation, and touch gestures on mobile with electric contact clicks.

Vintage Tube & Atmospheric Noise

Synthesizes authentic hyperbolic tube warmth with even/odd harmonics, alongside tunable radio static hiss and random contact pops.

Studio Master WAV Export

Render sustained tones, binaural beats, and logarithmic sweeps to uncompressed 16-bit 44.1 kHz WAV files for testing, acoustic tuning, or sharing.