Generate Any Frequency Instantly
Type any value from 20 to 20000, or drag the slider above.
Use the slider or type a frequency directly into the input box. You can generate any tone from 20Hz to 20kHz.
Choose sine for a pure clean tone. Square, sawtooth, and triangle give you different sound characters depending on what you need.
Adjust the volume to a comfortable level and click Play. The tone will generate instantly in your browser and continue until you click Stop.
A tone generator is a free online tool that produces pure audio tones at any frequency from 20Hz to 20kHz. You set the frequency, choose your waveform, and the sound plays instantly in your browser. No download, no signup, no software required.
This online tone generator works as a frequency generator, a sound generator, and an Hz generator all in one place. Whether you need a single pure tone for instrument tuning, a frequency sweep for testing your speakers, or a specific Hz value for a science experiment, everything runs directly in your browser on any device.
People use this tool for all kinds of reasons - audio engineers testing equipment, musicians tuning instruments, students exploring sound waves, and people checking their hearing range. Whatever you need a tone or frequency for, this tool generates it instantly and accurately.
Every online tone generator gives you four waveform options but most people just pick sine and move on. Here is what each one actually does so you can choose the right one for what you need.
This online tone generator produces the purest, cleanest tone. No extra harmonics, just a single smooth frequency. This pure tone generator waveform is the one to use for hearing tests, instrument tuning, audio equipment calibration, and tinnitus frequency matching. If you are not sure which to pick, start here.
A buzzy, rich sound with sharp transitions between high and low. Use this on the frequency generator to test how well your audio equipment handles complex audio signals. Also commonly used in electronic music production.
A bright, harsh tone that contains the most harmonics of all four waveforms. Good for testing high frequency speaker response and for synthesizer sound design.
Softer than the square wave with fewer harmonics. Produces a smoother, more rounded sound. Good for testing midrange frequency response without the harshness of the sawtooth.
Not sure which frequency to enter? Here is a quick reference for the most commonly used frequencies and what they are good for.
The low end of the audio spectrum. Use this range on the frequency generator to test the subwoofer and bass response of your speakers. If you hear rattling, distortion, or no sound at all in this range, your speaker has a bass problem worth investigating.
This is where human voice and most instruments sit. Clear, natural sound in this range means your speakers or headphones handle everyday audio well. Most audio issues that affect calls and music clarity appear in this range.
Clarity, detail, and brightness in audio. Use this range on the online tone generator to confirm whether your speakers or headphones are reproducing high frequencies correctly. If your audio sounds dull or muffled, this is where to check first.
The universal reference pitch for tuning instruments. Every guitar, piano, and orchestral instrument is tuned to this standard worldwide. Enter 440Hz into the tone generator and use it as your tuning reference.
A slightly lower version of the standard A pitch. Some musicians prefer the 432Hz tone generator for its warmer, more natural sound. Neither is right or wrong - it comes down to personal preference.
The theoretical range of human hearing. In practice most adults hear clearly between 40Hz and 16kHz to 18kHz. The upper limit naturally decreases with age. Use this Hz generator sweep to find your personal hearing limits and check which frequencies you can and cannot detect.
Tinnitus is a constant ringing, buzzing, or humming sound in your ears that only you can hear. If you experience this, this online tone generator can help you identify the exact frequency of that sound and use it to reduce the ringing. This process is called tinnitus frequency matching.
Open the frequency generator and start at a low frequency. Slowly increase using the slider until the generated tone sounds similar to the ringing in your ear. When you find a close match, check one octave higher by multiplying the frequency by 2 and one octave lower by dividing it by 2. Tinnitus frequencies are often confused with tones an octave apart so always check both before settling on a frequency.
Once you find your tinnitus frequency, play a gentle tone at or near that frequency at a low volume using this tone generator online. Hearing a soft external sound close to your tinnitus frequency makes the internal ringing less noticeable. This is called sound masking. You can also search for white noise or nature sounds in a similar frequency range to use during sleep or focused work.
Yes. This online tone generator works on any device including Android and iPhone. Open the page in your mobile browser, set your frequency, and play the tone directly through your phone speaker or connected headphones.
Yes. Once you generate a tone, click the Save button to download it as a WAV file. You can use the downloaded file in audio editing software, share it, or play it offline at any time.
Frequency is the technical measurement of sound in Hz. Pitch is how we perceive that frequency - whether a sound feels high or low to our ears. A higher Hz value means a higher pitch. 440Hz is the A note on a piano. 220Hz is the same note one octave lower.
Most built-in laptop speakers cannot physically reproduce frequencies below 100Hz to 150Hz. This is a hardware limitation, not a problem with the frequency generator. To hear bass frequencies accurately use headphones or external speakers with a subwoofer.
Yes. Generate specific frequencies across the full range and listen for distortion, rattling, or dead spots. Use 20Hz to 200Hz for bass, 200Hz to 2kHz for midrange, and 2kHz to 20kHz for treble. For a full performance breakdown use our speaker test or headphone test after running the frequency generator.
This tone generator uses the Web Audio API which produces precise frequencies at a sample rate of 44.1kHz. The accuracy of what you hear depends on your device hardware and headphones or speakers. For professional calibration use dedicated audio equipment.
Use the tone generator alongside the online hearing test to find the upper and lower limits of your hearing, or play tones through your setup with the speaker test.