--- title: "Frequency Sweep Generator - 20 Hz to 20 kHz | CanDoYa" description: "Frequency sweep generator for smooth 20 Hz to 20 kHz audio sweeps. Choose the range, curve, waveform, duration, and download a local WAV." url: https://candoya.com/tools/frequency-generator/ locale: en type: browser-tool --- # Free Frequency Sweep Generator Category: Social & Creator ## What is a frequency sweep generator? A frequency sweep generator plays a signal that moves from one frequency to another over a set time. Choose any range from 20 Hz to 20 kHz, use a linear or logarithmic curve, and listen or save the result. The browser creates the signal locally with no audio upload. This generator is built for moving signals rather than the fixed pitch produced by a tone generator. Use an upward sweep to scan a speaker system from bass to treble, reverse the endpoints for a downward sweep, or set both endpoints alike when you need a stable reference. **Listen safely:** begin at a low level, especially with headphones. The percentage control changes digital amplitude, not the sound pressure reaching your ears, and speakers may reproduce parts of the range unevenly. ## How to use it 1. **Set the endpoints** - Enter start and end frequencies from 20 to 20,000 Hz, or choose a practical range preset. 2. **Choose the motion** - Select a logarithmic sweep for even movement by frequency ratio, or linear for an equal number of hertz per second. 3. **Keep the level low** - Choose a waveform and begin with the default low output level before pressing Play sweep. 4. **Listen or save** - Watch the live frequency readout, stop at any time, or download the configured sweep as a mono 48 kHz WAV. ## Who it's for - **Audio technicians** can listen for rattles, dropouts, or abrupt level changes across a playback system. - **Speaker builders** can scan a selected bass, midrange, or treble band before using calibrated measurement equipment. - **Musicians and producers** can create short rising or falling sweep samples for transitions and sound design. - **Students** can compare equal-Hz linear motion with equal-ratio logarithmic motion across the audible range. ## Expert note A logarithmic 20 Hz to 20 kHz sweep spends equal time in each octave, while a linear sweep spends most of its duration at high frequencies. That makes logarithmic motion easier for listening across a three-decade audio range; it is still not a calibrated frequency-response measurement. ## Frequently asked questions ### Is this frequency sweep generator free? Yes. It is free to use without an account. You can play an unlimited number of sweeps and save mono WAV files locally. The available range is 20 Hz to 20 kHz, with linear and logarithmic curves plus sine, square, triangle, and sawtooth waveforms. ### Does the frequency generator upload or record audio? No audio is uploaded or recorded. The browser synthesizes live playback with the Web Audio API and creates WAV samples on your device. The tool does not request microphone permission. Ordinary page resources or analytics may still make network requests, so this statement applies to generated audio. ### What limits does the frequency sweep generator have? Each sweep can run from 1 to 60 seconds and between 20 and 20,000 Hz. WAV downloads use a mono 48 kHz, 16-bit PCM file. Browser and device volume, speaker range, headphones, and room acoustics all affect what you actually hear. ### Should I use a linear or logarithmic frequency sweep? Use logarithmic for most full-range listening checks because it gives equal time to each octave. Use linear when you need frequency to change by the same number of hertz every second. Neither option turns an uncalibrated speaker and microphone setup into laboratory measurement equipment. ### Can a frequency sweep test my hearing? It can demonstrate whether a tone seems audible, but it is not a medical hearing test. Device output varies widely, background noise masks frequencies, and unsafe volume can harm hearing. Keep the level low, stop if you feel discomfort, and consult a qualified clinician for hearing concerns. ### Why does part of the sweep sound quieter? Most speakers, headphones, and rooms do not reproduce every frequency equally. Laptop speakers often struggle with deep bass, while age, device design, fit, and playback level can affect high-frequency audibility. A level change may come from the playback chain rather than the generated digital signal. ## Related tools - [Tone Generator](https://candoya.com/tools/tone-generator/) - [Spectrum Analyzer](https://candoya.com/tools/spectrum-analyzer/) - [Guitar Tuner](https://candoya.com/tools/guitar-tuner/) - [Audio Waveform Image](https://candoya.com/tools/audio-waveform-image/) - [Metronome](https://candoya.com/tools/metronome/) --- *Markdown edition of , published for AI agents and other automated readers. Index of key pages: .*