Tone Generator

Dial in an exact tone with the Tone Generator — pick a waveform (sine, square, sawtooth, or triangle), drag the frequency slider anywhere from 20Hz to 20kHz or tap a note preset, then hit Play Tone to hear it and watch it move across the live spectrum and waveform graphs. The free decibel meter is a fast way to see a live number instead of guessing by ear. Use the spectrum analyzer to get an instant reading without any extra hardware.

Whether you're a musician trying to align instruments by ear, an audio engineer running an audio system test, or simply curious about the limits of your own perception, this tone generator gives you precise, instant control over signal pitch — right in your browser, with no downloads and no sign-ups required. The ability to produce any pitch on demand means you can diagnose playback problems, explore sonic properties, match a ringing-ear pitch, or investigate the science of oscillator-driven waves in real time.

How to Use This Online Tone Generator

This browser-based tone generator runs entirely via the Web Audio API, so it works on any modern device without installation. Whether you're on desktop, tablet, or mobile, the interface is fully responsive and touch-friendly. Here's how to get the most out of every setting.

Setting Your Frequency with This Tone Generator

The frequency input is the heart of the tool. You can drag the slider smoothly across the full audible spectrum, or type an exact value directly into the input field for precise tone generation.

Use the arrow keys on your keyboard for a 1hz increment adjustment at a time, or hold the shift key to jump in 10hz increment steps — ideal for rapid alignment. To change frequency by an octave, use the ×½ and ×2 buttons: pressing ×2 will double frequency, sending your signal exactly one octave higher, while ×½ will halve frequency, dropping it one octave lower instantly. This smooth, fine-grained slider approach gives you keyboard control that rivals dedicated signal-generator software.

The tool covers a span of 1 Hz to 20 kHz (or 1 Hz to 20000 Hz) — the highest frequency reachable extends to the uppermost treble near 10000 Hz and beyond, spanning the entire human perception spectrum from deep sub-bass at the lowest threshold. At the extremes — below 20hz and above 22000hz — human sensitivity drops sharply, so exercise caution with your output level.

Choosing Your Waveform: Signal Types and Beyond

Waveform selection changes the character of the output fundamentally. Click the toggle to cycle through four options:

Sine wave — a smooth, mathematically pure tone with no overtones; the standard choice for auditory checks and precise calibration, producing a constant tone ideal for testing hearing sensitivity
Rectangular signal — rich in odd overtones, producing a buzzy, electronic quality useful for lab experiments and checking playback response across harmonics
Triangle wave (triangular signal) — softer and warmer than the rectangular type, with a gentler overtone content; favoured for educational demonstrations of wave properties in science and education contexts
Ramp signal (saw tooth) — the harshest of the four, containing all overtones; commonly used in synthesis, signal-generator work, and room-response evaluation

You can also mix tones by opening multiple browser tabs — each running its own oscillator instance for simultaneous tone generation. This enables binaural beat creation, chord experiments, and even rudimentary multi-tone setups directly in your client application.

Adjusting Volume and Playing Your Signal Safely

Before you play tone, set your system level to a low setting. A good baseline: set the output so a 1,000 Hz pure sine is comfortable at your normal listening position, then do not exceed that — particularly at extremes of the pitch range.

The stop button immediately halts playback. You can damage your hearing or your speakers if you play tones at extreme volumes. High-pitched signals are especially risky because your auditory system may not register strain before harmful output levels have already caused lasting damage.

Do not reach peak output for extended sessions; if you feel any physical unease or ringing, stop immediately.

For stereo balance control, use the L/R pan slider to route the signal left or right — useful for headphone checks, binaural setup experiments, and evaluating spatial listening characteristics. The stereo operation mode supports dual signals across channels, while mono operation sends the same output to both sides.

System Requirements and Browser Compatibility

This online tool is compatible with all major modern clients. It works in Chrome, Firefox, Safari, and Microsoft Edge.

It runs on PC or Mac and natively on iOS — including on an Apple phone and tablet — as well as Android devices. No installation required; it simply runs via the Web Audio API in your client application. If your client does not produce output, update it to the latest version.

Alternatively, you can save the output: generate a rendered audio file at a standard sample rate, saved as a downloadable clip that is playable in any editing suite or media player — no internet connection required for playback after saving. This makes it a practical alternative to a dedicated tone generator app for offline use.

What You Can Do with a Sound Frequency Generator

A tone generator used as a sound frequency generator is far more versatile than it might first appear. From audiology and neuroscience to music production and engineering, the ability to generate clean, controllable signals serves professionals, students, performers, and curious beginners alike. Below are the most common and impactful applications. Run the dac and sound card audio quality test to see exactly what's working and what isn't.

Common Uses and Applications

Testing hearing — sweep through audible pitches from the lowest threshold upward to map your personal perceptual range; useful for informal audiology screening and identifying pitches your ears struggle to detect (see worked example below); formal hearing tests should be conducted by a qualified audiologist
Instrument alignment — generate reference signals at exact pitches to tune guitars, pianos, and other gear by ear without a physical tuner; standard concert pitch is 440 Hz (A4)
Playback system checks and headphone evaluation — sweep through pitches to expose resonance issues, weak spots, and rattles in drivers; a bass check at low pitches reveals subwoofer performance; this is a core use case for testing audio equipment
Ringing-ear relief and pitch matching — identify the precise pitch of perceived tinnitus; use masking signals and pitch discrimination training to manage pure-tone ringing
Lab demonstrations and education — demonstrate wave properties, resonance, and acoustics in classrooms; explore the resonant pitch of objects; ideal for scientific use in school and university settings
Equipment alignment — produce precise test signals for calibrating amplifiers, mixers, and recording gear; also supports broadcast level alignment and equalization workflows in engineering contexts
Wellness listening and relaxation — explore solfeggio pitches, healing tones, and signals associated with focus and deep sleep; this online tool supports sound health practices
Signal and waveform generation in electronics contexts — use as a signal source alongside a spectrum analyzer, oscilloscope, or level meter
Running multiple oscillator instances via separate client tabs to mix signals for beats, chords, and harmonic intervals — a basic chord and sweep generator in one
Microphone checks and output-card verification — play test signals to check input/output latency and output-card fidelity; verify level across the signal chain
Ear training — use reference tones and pitch exercises to help performers recognise intervals and develop discrimination skills
Exploration of Alzheimer's disease research contexts — generate 40 Hz tones as referenced in neuroscience studies on gamma-frequency stimulation (see below)

Worked Examples: Auditory Check, Instrument Alignment, and System Test

Auditory check: Start this online tool at the lowest setting and gradually increase the pitch. Note the lowest point where you first perceive vibration, then continue sweeping upward.

Most adults begin losing sensitivity above 12,000–15,000 Hz; the point where you can no longer detect the signal marks your personal upper limit. Sweep through pitches methodically and also adjust each ear independently using the stereo pan — this reveals whether your perception differs between left and right, a useful informal reference. Remember: at the upper end, you may not feel strain even when output levels are harmful, so keep the level low throughout any testing hearing session.

Instrument alignment: A guitarist needs to tune their A string to standard concert pitch. Set the tone generator to exactly 440 Hz, select a clean sine signal for a pure reference, and play it through headphones or a playback device.

Pluck the A string and tighten or loosen the peg until the string's pitch matches the generator's signal — beating (a wavering interference pattern) disappears when the pitches align. This technique also works with 432 Hz for performers who prefer alternative pitch standards. The ability to align instruments precisely without any additional hardware makes this free online tool invaluable on stage or in the studio.

System test: A home audio enthusiast wants to evaluate their subwoofer's low-pitch performance. Set the tone generator to 60 Hz and select a sine signal (the purest type for sub-bass evaluation).

Play the signal at moderate output through the playback system while listening for distortion, rattles, or room resonance. Then gradually sweep downward to find the point where the bass driver begins to roll off.

Switch to a ramp signal at 80–100 Hz to stress-test overtone reproduction. This methodical approach to testing audio equipment helps expose resonance issues and weak spots that would otherwise go undetected — all using a browser-based signal source with no downloads needed.

Frequently Used Pitches and Their Significance

Certain signal pitches appear repeatedly across audiology, pitch standardisation, wellness, and research contexts. The table below covers the most commonly referenced Hz values, their applications, and the context in which they matter — from solfeggio systems to neuroscience and production.

Frequency (Hz)	Common Name / Type	Application / Significance	Signal Type	Context
20 Hz	Sub-bass threshold	Lower limit of human perception; bass check for subwoofer and output-card; deep sub-bass driver evaluation; testing audio equipment at the lowest threshold	Sine	Electronics, engineering
40 Hz	Gamma / 40 Hz stimulation	Referenced in Alzheimer's disease neuroscience studies (MIT work on transgenic mice and human trials); studied for molecular changes in the brain	Sine	Research, health, medical supervision recommended
60 Hz	Mains hum / bass	Diagnosing bass resonance and driver distortion; system check for low-pitch response	Sine / Rectangular	Engineering, production
396 Hz	Solfeggio — Ut	First solfeggio pitch; used in wellness listening and healing-tone traditions; relaxation	Sine	Wellness, relaxation
432 Hz	Alternative A4 / 432hz	Alternative concert-pitch standard; preferred by some performers; shareable via frequency link	Sine	Instrument alignment, production
440 Hz	Standard concert A4	ISO standard concert pitch; universal reference for aligning guitars, pianos, orchestras; most common instrument-alignment reference	Sine	Performance, production
500 Hz / 1000 Hz	Mid-range reference	Safe level calibration reference (set comfortable level at 1000 Hz); broadcast level alignment; calibration and engineering checks; 500 Hz used in test signals	Sine	Broadcasting, calibration
528 Hz	Solfeggio — Mi	Popular solfeggio pitch associated with healing tones and wellness listening; used in relaxation practice	Sine	Wellness, relaxation
White / Pink noise	Noise signals	White noise covers all pitches equally; pink noise rolls off at higher pitches — both used in room-response evaluation, equalization, and ringing-ear relief	White / Pink noise	Engineering, noise relief

Key Features of This Tone Generator at a Glance

Full pitch span: generate any pitch across 1 Hz to 22 kHz covering the entire human perceptual spectrum from deep low signals to the uppermost treble
Four signal types: switch between sine, rectangular, triangle, and ramp signals — each with a distinct overtone character
Real-time display: a live signal visualisation renders as you play, functioning like an oscilloscope display for immediate feedback
Stereo balance control: pan the output left or right for binaural experiments, spatial perception checks, and headphone evaluation; supports both stereo and mono operation
Shareable settings: generate a link for any configuration — perfect for sharing in classrooms, research, and collaborative work
Download option: save output as a wav file (a 10 second wav clip at a standard sample rate) — a clean file that works in any editing suite including WavePad Sound Editor
Simultaneous signal generation: open multiple client tabs to run signals concurrently — create beats, chords, and overtone combinations for lab work
Sweep generation: use as a sweep source with both log and linear modes for comprehensive driver and room-response evaluation
No installation required: fully client-based, with no downloads and no sign-ups — open and play instantly on any device including phones, tablets, and all desktops
Professional-grade precision: use keyboard control, smooth slider, and direct input for exact pitch values demanded by professionals and engineers

Frequently Asked Questions About This Online Frequency Generator

Users exploring this online frequency generator often have practical questions about safety, compatibility, and what each feature actually does. The answers below draw on established audiology, production practice, and engineering principles.

Can I use this for instrument tuning?

Yes — this is one of the most popular uses. Set the tool to the exact Hz value for the note you need, then match your instrument's pitch by ear.

For standard concert A4, use 440 Hz. For 432 Hz alignment, type that value directly or use the link shortcut.

The sine signal type is ideal for instrument tuning because it produces a pure tone with no overtones to confuse the ear — making it the clearest reference for alignment workflows. Performers using this as a tone generator app substitute will find the precise pitch control more than sufficient for professional use.

Is it safe to use high frequencies?

This requires a clear safety warning: playing any signal at extreme output levels can cause lasting auditory damage or harm your playback equipment. At high pitches — particularly above 10,000 Hz — your ears may not signal distress before damage has occurred.

Always begin at a low level and increase slowly. Use a comfortable 1,000 Hz signal to set your baseline, then do not exceed that at any pitch.

If you experience ringing, unease, or muffled perception, stop immediately and rest. The same caution applies to drivers: harmful levels at extreme pitches can blow tweeters or stress amplifiers.

This tool is not a medical device; for clinical auditory evaluation consult an audiologist and work under medical supervision. Good auditory health depends on responsible use.

What are the different signal types for?

Each signal type has a different overtone structure and therefore a different sonic character:

Sine: A mathematically pure signal — smooth, single-pitch output with zero overtones. Best for auditory checks, instrument-alignment reference, and precise calibration. This is what most people mean when they say pure tones. It produces a constant tone ideal for testing hearing thresholds.
Rectangular signal: Contains all odd-numbered overtones at decreasing amplitude. Sounds buzzy and electronic. Useful for checking driver harmonic response, band signalling, and electronic tasks in engineering.
Triangle signal: Also contains odd overtones, but they roll off much faster than the rectangular type — resulting in a softer, more mellow output. Good for demonstrating wave properties in educational contexts and science demonstrations.
Ramp signal: Contains all overtones (odd and even) and sounds bright and aggressive. Used in room-response evaluation, synthesis demonstrations, and any situation requiring a spectrally rich signal.

For tasks involving broadband signals, some software packages also offer white and pink noise options — a white noise source covers all pitches equally, while a pink noise source applies a natural roll-off matching human sensitivity. These broadband signals are invaluable for room assessment and equalization.

What frequency range can I generate?

This tool covers 1 Hz to 20 kHz (technically 1 Hz to 20000 Hz), encompassing the entire accepted human audible span. Some implementations extend to 22,000 Hz subject to your output card and driver capabilities.

At the low end, signals below 20 Hz are infrasonic — below normal human perception — while signals above 10000 Hz approach the ultrasonic. As a practical note: doubling any pitch raises it by one octave, so 440 Hz becomes 880 Hz one step higher; halving it drops it one step lower to 220 Hz.

The precision of this tool — including fractional Hz values via keyboard control — makes it suitable for pitch matching, ringing-ear pitch identification, and demanding pure-tone identification tasks. You can change frequency smoothly at any time during playback.

Does this work offline, and is there a tone generator app alternative?

This client-based tool requires an active internet connection for initial loading. However, you can save the output as a wav file (standard sample rate, 10-second clip) for fully offline playback.

For a dedicated offline solution, desktop software such as WavePad Sound Editor includes a signal-generation tool in its Tools toolbar — available on Windows 7, Windows 10, Windows 11, and macOS. A tone generator app for iOS or Android is also available as a free or paid download, offering signal generation and recording capabilities alongside editing tools. These offline alternatives support additional features like simultaneous generation of up to 16 signals at once, log and linear sweep modes, and production workflows including saving output directly from the application.

Start generating test signals today — no account, no installation, and no cost. Whether you're an engineer running calibration checks, a performer perfecting instrument alignment, a student exploring wave properties for an education assignment, or someone investigating ringing-ear relief options, this tone generator is ready the moment you open the page. Adjust the pitch, select your signal type, set a safe level, and press play — it's that simple and easy to use.