Free online tone generator · No signup · Runs in browser
Frequency sweep generator
Free frequency sweep generator and gliding hertz generator — sweep from any start hertz sound to any end pitch over a chosen duration, linear or logarithmic. The classic speaker, headphone, and room response test. Part of our free online tone generator toolkit.
Ready
— Hz
Safe use: sweeps pass through sensitive high frequencies — keep volume low and stop if uncomfortable. Local synthesis only; nothing recorded.
Logarithmic vs linear sweeps
Logarithmic sweeps move at a constant musical pace — each octave takes the same time. Use this frequency sweep generator mode for speaker and room listening tests; it matches how a pitch generator is actually heard.
Linear sweeps move at a constant Hz-per-second pace, racing through bass and crawling through treble. Use it when calibrating measurement gear or demonstrating how tone generator Hz perception works.
Listen for volume dips (room nulls), rattles (loose objects), and the point where bass or treble fades — that is your gear's rough limit. This frequency player check is informal, not lab measurement. Prefer single steps? Use the main pure tone generator for exact sine values, or stack tones in the multi tone generator.
Best sweep settings to try
- Full-range speaker test: 20 Hz → 20,000 Hz, 15 seconds, logarithmic, sine wave.
- Bass roll-off finder: 30 Hz → 200 Hz, 10 seconds, logarithmic, low volume.
- Tweeter check: 2,000 Hz → 12,000 Hz, 8 seconds, sine — keep brief and quiet.