Frequency Sweep Generator — Free
Free frequency sweep generator with linear, logarithmic and percussive sine sweeps between any frequencies. Adjustable time. Free in your browser, no download.
Protect your hearing. Start at a low volume. Never raise the volume to make a tone audible. Levels are shown in dBFS, relative to full scale — not SPL.
How it works
Sweeps are generated live in your browser with the Web Audio API using scheduled oscillator ramps. Nothing is uploaded or recorded. Levels are reported in dBFS, relative to full scale.
A sweep generator plays a tone that glides smoothly from one frequency to another. Instead of listening to a single fixed pitch, you hear the whole range in one pass, which makes it fast to spot a speaker that drops out, a room resonance, or a frequency you cannot hear. Everything is generated live with the Web Audio API, so no file is uploaded and nothing is recorded.
Frequency sweep for speaker and headphone testing
Set a start and end frequency, choose a duration, and press play. A slow sweep from 20 Hz to 20 kHz traces the full audible band in a few seconds, exposing buzzing cabinets, rattling panels, and drivers that roll off early. Pair it with the tone generator when you want to stop on a specific frequency.
Linear sweep generator
A linear sweep moves by a constant number of hertz per second, so it covers low frequencies slowly and high frequencies quickly. Use it when the measurement or demonstration is defined in hertz, such as a fixed-bandwidth measurement.
Logarithmic sweep generator
A logarithmic sweep moves by a constant ratio per second. Because pitch is perceived logarithmically, a log sweep sounds smooth and even and spends equal time in every octave. This is the default and the right choice for hearing-range and octave-based work.
Percussive sweep
Percussive mode fires a sequence of short chirps rather than one continuous glide. The gaps between chirps give your ears a reference point, which makes this mode well suited to quick screening tests.
Frequently asked questions
What is a sweep generator?
A sweep generator plays a tone whose frequency glides continuously from a start frequency to an end frequency over a set duration. It is used to reveal how speakers, headphones, and rooms respond across the audible range.
What is the difference between a linear and logarithmic sweep?
A linear sweep changes frequency by the same number of hertz per second. A logarithmic sweep changes by the same ratio per second, so it spends equal time in each octave and sounds even in pitch. Log sweeps are the usual choice for hearing and room tests.
What is percussive mode?
Percussive mode replaces the continuous glide with a series of short, discrete chirps separated by gaps. It is useful for hearing tests and for making the start and end of each sweep easy to identify by ear.
Which direction should I choose?
Sweeping up from low to high is the default. Sweeping down from high to low lets you confirm that a driver produces the same response regardless of the direction of travel.
Is this safe for my hearing?
Start at a low volume and never raise the volume to make a sweep audible. High frequencies in particular can be uncomfortable. Sweeps play only from a user gesture and the transport provides a persistent Stop and Mute.