Frequency Generator
Free online frequency generator & tone generator: pure tones, binaural beats, noise & harmonics. Speaker water ejector, subwoofer bass test, tinnitus ma...
Tone Generator Controls
Waveform
Pick the tone shape — sine gives the purest test tone.
AM / FM Modulator
Tremolo speed (AM) or vibrato speed (FM)
Safety limiter: a soft-knee compressor guards your speakers and ears from clipping. A safe listening level is around 30–50%. Hotkeys: Space play/stop · ↑↓ frequency · ←→ volume · M mute.
Visualizer & Smart Presets
Smart Utility Presets
One-click audio utilities for speakers, ears and meditation — each one matches a common search.
Export & Share
Renders the current tone, binaural pair, noise or sweep offline and downloads it as a 16-bit WAV file.
The URL syncs automatically with your settings — for example ?freq=432&wave=sine&mode=binaural&beat=7.83.
Embed this tool
Copy and paste the code below into your website to embed this tool for free. An attribution link to The Util Box is required.
<iframe src="https://www.theutilbox.org/embed/frequency-generator" width="600" height="500" frameborder="0" style="border: none; max-width: 100%;" title="Free Frequency Generator tool from The Util Box"></iframe> <!-- Free tool by The Util Box — https://www.theutilbox.org/tools/frequency-generator --> <a href="https://www.theutilbox.org/tools/frequency-generator">Frequency Generator by The Util Box</a>
Frequently Asked Questions about Frequency Generator
Understanding Audio Frequencies & How to Use a Frequency Generator
Every sound you hear is a vibration measured in Hertz (Hz) — the number of complete wave cycles per second. A low bass note might sit at 60 Hz, while a piercing whistle can exceed 15,000 Hz. When numbers get large, engineers switch to kilohertz (kHz), where 1 kHz equals 1,000 Hz. Human hearing spans roughly 20 Hz to 20,000 Hz (20 kHz), though that upper limit drops with age. Our free audio frequency generator lets you produce any tone across this entire range instantly — no equipment, no downloads, just your browser. It is also a complete online tone generator with binaural beats, noise synthesis, and a hertz generator for precise speaker and hearing tests.
Practical Use Cases
A sound frequency test tool is far more than a novelty. Here are the most common reasons people use this audio frequency generator every day:
Headphone & Speaker Testing
Play tones from 20 Hz to 20 kHz to evaluate frequency response on headphones, subwoofers, and studio monitors. Sweep from low to high to identify dead spots, distortion thresholds, or rattling components — a quick sound frequency test that audio engineers rely on daily.
Speaker Water Ejector
After exposure to rain or splashes, an alternating 150 Hz bass punch and 2.5 kHz resonant pulse forces the speaker cone to vibrate, pushing trapped moisture out of the grille. This speaker water ejector runs a guided 30-second cycle with a live progress ring — it works on phones, laptops, and Bluetooth speakers, no rice bag required.
Musical Instrument Tuning & 432 Hz
Generate a precise reference tone — such as A4 at 440 Hz — and tune a guitar, violin, piano, or wind instrument by ear. Compare the 432 Hz frequency generator against standard A440, or explore 528 Hz and the full solfeggio scale. The waveform selector lets you match the harmonic character of the reference tone to your instrument.
Room Acoustics & Hearing Tests
Sweep through the audible range to discover room resonances, standing waves, or acoustic dead zones. The guided hearing range sweep walks you from 250 Hz to 16 kHz with clickable perception markers, and the tinnitus frequency matcher converges on your tinnitus pitch with a nine-step binary search.
Binaural Beats & Brainwave Entrainment
The built-in binaural beats generator plays two slightly different frequencies, one in each ear, so your brain perceives a phantom third tone — the beat. Select a brainwave preset: Delta (1–4 Hz) for deep sleep, Theta (4–8 Hz) for meditation and REM, Alpha (8–13 Hz) for relaxed focus, Beta (13–30 Hz) for alert concentration, or Gamma (30–50 Hz) for peak cognition. A dual-oscillator engine with independent gain and L/R pan gives you a full brainwave entrainment tone player. Always use headphones and a comfortable volume.
Safe Listening Warning
Protect your hearing and your hardware. Prolonged exposure above 85 dB can cause permanent hearing damage — and the risk increases sharply at very low or very high frequencies where the ear is less sensitive and you may unknowingly raise the volume. Start at a low level and increase gradually. Avoid playing sub-bass tones (below 25 Hz) or treble above 15 kHz at high volume, as extreme cone excursion and harsh frequencies can damage small drivers and cause ear fatigue. Our tone generator shows a live warning in these zones and routes all output through a soft-knee safety compressor.
How the Audio Frequency Generator Works
This audio frequency generator uses the browser's built-in Web Audio API to synthesize tones in real time. Choose from four waveforms — sine, square, sawtooth, and triangle — each with a distinct harmonic profile, or build your own additive tone from the 1st to 5th order partial harmonics. The sweep mode glides between any two frequencies using linear, logarithmic, or ping-pong curves, ideal for a comprehensive sound frequency test or a subwoofer bass test from 20 Hz to 120 Hz. Live oscilloscope and spectrum analyzer canvases show exactly what is playing, and the downloadable audio tone WAV generator exports any tone or sweep as a 16-bit WAV file. Every calculation runs locally; no audio data ever leaves your device.