Runs entirely in your browser - no upload, no sign-up.
Audio sweep lab
Move smoothly between two frequencies with a timed Web Audio signal.
Use 20 to 20,000 Hz.
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.
Enter start and end frequencies from 20 to 20,000 Hz, or choose a practical range preset.
Select a logarithmic sweep for even movement by frequency ratio, or linear for an equal number of hertz per second.
Choose a waveform and begin with the default low output level before pressing Play sweep.
Watch the live frequency readout, stop at any time, or download the configured sweep as a mono 48 kHz WAV.
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.
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.
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.
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.
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.
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.
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.
