Online Tone Generator
Free Single Pitch Tone Generator
Welcome to the Online Tone Generator. This tool allows you to play a pure tone at any custom frequency directly inside your browser. Simply select the wave type, enter the frequency you wish to generate, and hit Play.
Play multiple tones at the same time to hear chords, harmonics, and complex wave superposition. You can add as many oscillators as your device supports and configure each individually.
Upload any audio file (MP3, WAV, FLAC, etc.) and shift its pitch up or down in semitones and cents, without changing the playback speed. Uses time-domain overlap-add grain shifting.
Slow down or speed up an audio file without changing its pitch. Upload an audio track, adjust the playback rate slider, and choose whether to preserve the original pitch.
Type text into the box below and let your browser's Speech Synthesis Engine speak it aloud. You can select different voices, alter the pitch, and adjust speed rate settings.
Record audio through your device's microphone. You can play back the recording directly on the page, inspect the audio file size, and download it as an audio clip.
Generate a continuous sweep tone that transitions from one frequency to another over a specified time duration. You can sweep either linearly or exponentially.
Tune your instrument using reference pitch generators, or use the **live microphone tuner**. Autocorrelation is used to analyze mic input and detect musical notes in real time.
Test the frequency limits and response of your subwoofer. Low frequency tones push the limits of air displacement. Please be careful with volume settings to avoid speaker blowouts!
Determine your hearing range and create an audiogram. In this test, we play tones at specific frequencies. For each tone, adjust the volume slider until the tone is just barely audible, then click Next.
Your Audiogram Test Result
Create alarms, sirens, and warning signals. You can adjust the base tone frequency, LFO pulse speed, and waveform style, mimicking standard alarm devices.
Play three common colors of noise. White noise is bright (equal power per frequency), Pink noise is balanced and natural (ideal for focus/sleep), and Brown noise has deep rumble (waterfall effect).
When two sine waves of slightly different frequencies (eg f1 and f2) are played on a loudspeaker, the waves will undergo interference. This means that by the time the sound reaches your ears, the waves will have physically added together and this superposition results in a wave at a frequency of (f1+f2)/2 which beats at a frequency of f2-f1.
If the two tones are played through headphones (one frequency in the left ear, another in the right ear) each ear receives a pure tone and no physical interference can occur. Amazingly, the majority of people will still perceive a beating sound which is a purely psychological effect and is known as a "binaural beat".
Use the Binaural Beat Generator below to investigate this effect yourself. Please note, headphones must be used for the effect to work.
Isochronic tones are regular beats of a single tone created by rapidly turning the tone on and off (amplitude modulation). Unlike binaural beats, they do not require headphones because the beating occurs physically in the audio signal.
Choose standard manual mode, or configure a structured session with ramps and anti-habituation drift to simulate brainwave entrainment profiles.
A432Hz tuning, known as Verdi's A, is said to be musically warmer and more in tune with natural acoustics compared to standard A440Hz tuning. Play scales and test the frequency difference below.
DTMF (Dual-Tone Multi-Frequency) signaling is the method used by analog telephone lines to transmit keypad digits. Each key mixes a specific low frequency and high frequency tone.
A simple audio metronome for tracking time signature and tempo speed. Uses precise Web Audio API scheduler loops to avoid interval drift.
The Greenwich Time Signal (GTS), commonly known as "The Pips", is a series of short tones broadcast at hourly intervals by the BBC. It consists of 5 short pips of 100ms at 1000Hz, followed by a longer 6th pip of 500ms indicating the exact hour.
Wave Interference and Beat Frequencies
When two sound waves of slightly different frequencies travel through the same medium, they undergo a process called interference. In areas where the waves align peak-to-peak, they reinforce each other constructively, resulting in increased amplitude (loudness). When they align peak-to-valley, they interfere destructively, canceling each other out. This cyclical change in volume is perceived as a "beat," with a frequency equal to the difference between the two parent frequencies: f_beat = |f1 - f2|.
What is a Binaural Beat?
Unlike physical acoustic beats, which occur in the air before reaching the ears, binaural beats are cognitive auditory illusions. By sending one steady frequency into the left ear and a slightly different frequency into the right ear via headphones, the brain's superior olivary complex compiles these inputs and synthesizes a phantom beat. Research suggests these beats can stimulate brainwave entrainment, altering cognitive states, enhancing focus, or encouraging deep meditation.
The Solfeggio Scale and 432 Hz Tuning
Standard Western music is tuned to standard concert pitch where the A4 note is calibrated to 440 Hz. In contrast, alternative tunings like A432 Hz (often called Pythagorean or Verdi's A) align the frequencies mathematically to integer ratios that are purported to mirror the natural harmonics of the universe. While scientifically debated, many musicians prefer A=432Hz for its perceived acoustic warmth, roundness, and reduced harshness at high registers.
Dual-Tone Multi-Frequency (DTMF)
DTMF signaling is the cornerstone of touch-tone telephone routing. Instead of sending binary digital bits, phone keypads mix a unique pair of high and low audio frequencies. The low frequencies (697–941 Hz) identify the keypad row, while the high frequencies (1209–1633 Hz) identify the column. This system was designed to resist voice mimicry, ensuring that human vocal harmonics wouldn't accidentally trigger telephone routing systems.
Support Online Tone Generator! Check out our vintage collection of audio merchandise, diagnostic tools, and tuning equipment below.
Vintage "440Hz Pure Sine" T-Shirt
Chroma Steel A440 Tuning Fork
Subwoofer Sweep & Test Audio CD
Acoustic Studio Foam Panels (12 Pack)
About Online Tone Generator
Online Tone Generator is an old-school catalog of signal generation and digital acoustic utility tools, rebuilt using modern browser APIs. It allows musicians, audio engineers, students, and subwoofer hobbyists to play, test, and analyze frequencies without requiring external audio hardware or bloated native desktop programs.
Privacy & Security Policy
We respect your privacy. All audio analysis, speech synthesis, microphone tuning, and audio file manipulation runs strictly locally inside your web browser. Absolutely no audio data, files, text transcripts, or recordings are sent to remote servers. This website has zero tracking cookies, zero advertisements, and zero background analytics script trackers.
Core Technical Frameworks
This application is powered by the HTML5 Web Audio API, utilizing built-in oscillators, gain controls, stereo panning matrix networks, and MediaRecorder devices. Script execution and DOM rendering are handled with light, fast vanilla Javascript modules to achieve instantaneous load times and zero framework overhead.
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