Free online tone & frequency generator
Online Tone Generator
Generate a tone at any frequency, choose your waveform, and download it as a WAV file — entirely in your browser, with no sign-up.
Waveform
Pure, smooth tone with no harmonics. The classic test waveform.
Download WAV
The tone auto-stops after 60 seconds to save your battery.
How to use this tone generator
The tool runs entirely in your browser using the Web Audio API. Follow these steps to produce the exact tone you need.
- Set the frequency. Type a value in the frequency box or drag the slider between 1 Hz and 20,000 Hz. The current value is shown in real time.
- Pick a waveform. Choose from sine, square, triangle, or sawtooth. Each has a different timbre, so try a couple to find the sound you want.
- Adjust the volume. Use the volume slider so the tone is comfortable. Low frequencies often need extra volume, especially on phone speakers.
- Play. Press the large Play button. Press Stop when you are done, or let it auto-stop after 60 seconds.
- Download. If you want to keep the tone, pick a duration and press Download WAV to save an audio file.
Tone waveforms explained
A tone is more than its frequency — its waveform shapes the timbre you hear. Here is what each option sounds like.
Sine wave
Smooth and pure, containing only the fundamental frequency. Best for tuning and clean reference tones.
Square wave
Sharp and hollow, rich in odd harmonics. The brightest of the common waveforms.
Triangle wave
Softer than a square wave with a mellow harmonic content — a good middle ground.
Sawtooth wave
Bright and buzzy, containing both odd and even harmonics. Good for making a tone cut through a mix.
Common uses for a tone generator
A free online tone generator is useful in more situations than you might expect.
- Instrument tuning. Play a 440 Hz sine to match the standard A4 reference for tuning guitars, violins, and other instruments.
- Hearing checks. Sweep through frequencies to test how low and how high you can hear.
- Speaker testing. Use low frequencies like 174 Hz to test bass response and high ones to check treble clarity.
- Meditation and relaxation. Frequencies like 432 Hz and 528 Hz are popular background tones for calming routines.
- Music production. Generate a reference tone to check levels or align audio gear before a mix.
- Sleep and study. A steady, soft tone can mask distracting background noise.
Frequently asked questions
What is an online tone generator?
An online tone generator is a browser tool that produces a continuous sound at a chosen frequency. You pick the frequency in hertz, the waveform (sine, square, triangle, sawtooth), and the volume, then play the tone right on the page.
What is the best frequency for tuning an instrument?
440 Hz is the universal standard reference pitch for the note A4, so it is the most common choice for tuning. Many musicians use a pure sine wave at 440 Hz to match their instrument.
Can I download the tone as a WAV file?
Yes. Choose a duration (1, 5, 10, or 30 seconds) and press Download WAV. The file is rendered in your browser using the Web Audio API, so no audio is uploaded to a server.
Which waveform should I use?
It depends on what you need. A sine wave is clean and pure, ideal for a tuning reference. Square and sawtooth waves sound brighter and richer in harmonics, while a triangle wave sits in between. Experiment to find the timbre you want.
Are the Solfeggio frequencies (432 Hz, 528 Hz) medically proven?
No. Frequencies like 432 Hz and 528 Hz are popular in meditation and sound-healing communities, and many people enjoy them for relaxation or focus, but their claimed benefits are cultural rather than medically proven. Use them as a pleasant sound, not as a treatment.
Why does the tone stop automatically?
To avoid leaving audio running by accident and draining your battery, the tone auto-stops after 60 seconds. Press Stop anytime to silence it sooner.