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Frequency Generator

Generate an adjustable audio tone directly in your browser. Choose a frequency, waveform and supported sweep options for speaker and general audio testing.

Ready

Hz
20 Hz20,000 Hz
Waveform
40%
Advanced controls

Sweep Mode automatically ramps the frequency between two points. Start playback above first, then start the sweep.

60 Hz
4000 Hz
8s
Audible range, speaker capability and safe playback volume vary by device and person -- not every speaker can reproduce the full 20 Hz - 20 kHz range.

What Is a Frequency Generator?

A frequency generator produces a repeating audio signal at a selected frequency.

Frequency is measured in hertz (Hz). A 100 Hz tone repeats 100 cycles per second; a 1,000 Hz tone repeats 1,000 cycles per second.

The frequency control changes the pitch of the generated tone. It does not measure the actual frequency response or condition of your speaker.

How to Use the Tone Generator

1. Lower your volume before starting.
2. Choose a frequency.
3. Select a waveform if needed.
4. Start the tone.
5. Adjust gradually.
6. Stop immediately if the sound becomes uncomfortable.

Waveforms

Sine: a smooth single-frequency waveform useful for straightforward tone testing.

Square: contains the fundamental frequency plus additional harmonics and sounds more buzzy.

Triangle: contains harmonics but generally sounds softer than a square wave.

Sawtooth: contains a broad harmonic series and has a bright, buzzy character.

No single waveform is universally "better" -- they suit different listening or testing purposes.

What Is a Frequency Sweep?

A frequency sweep changes gradually from one frequency to another.

It can be useful for listening for obvious changes, resonances, rattles or dropouts across a range.

A browser sweep is a listening tool. It is not calibrated laboratory measurement equipment.

Frequency Generator vs. Speaker Test

Use Speaker Test when you want a simple guided output/channel check. Use Frequency Generator when you specifically want control over tone frequency, waveform or sweep behavior.

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Speaker Test

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Frequently asked questions

What is Hz?

Hz (hertz) measures how many times a sound wave repeats per second. A higher Hz value is a higher-pitched tone; a lower value is a lower-pitched tone.

What frequency should I use to test a speaker?

There's no single correct frequency for every purpose. A sweep across the range can help you hear where output changes; a fixed tone like 440 Hz is a common general reference point.

Why can't I hear very low or very high frequencies?

Small phone and laptop speakers often can't reproduce the extremes of the range well, and human hearing itself varies by person and narrows with age, especially at the high end. Not everyone can hear the full 20 Hz-20 kHz range, and that's a normal hardware and hearing limitation, not a fault in the tool.

What is a frequency sweep?

A sweep gradually ramps the tone from one frequency to another, which can help you notice a rattle, resonance or drop in output as it passes through different frequencies.

Can this measure my speaker's frequency response?

No. It's a listening tool, not calibrated measurement equipment. It can help you notice obvious changes by ear, not produce a precise frequency-response measurement.

Why does the tone sound different on different devices?

Speaker size, enclosure design and audio processing vary by device, so the same frequency and waveform can sound noticeably different from one speaker to another.