Choose a signal
Start with 440 Hz, then adjust frequency, waveform, channel, and digital level for the check you want to make.
Browser audio utility
Online Tone Generator
Set a frequency, choose a waveform, and listen through your current output device. Everything in this tool runs in the browser.
Single tone
Set a frequency and listen
Ready to play
Frequency controls
20–20,000 Hz
Start with your device volume low.
Presets
0–25%; separate from device volume
Start with your device volume low. Digital level changes the signal sent by this page; it is not the same as output-device volume or dB SPL, and it is not a medical or measurement instrument.
A simple listening workflow
Use the tone generator in three steps
Turn your device down
Lower the computer, phone, interface, or speaker volume before pressing Play. Raise it slowly only if the signal is comfortable.
Compare what you hear
Use the channel controls to compare left, right, and both sides. The page sends audio; it does not diagnose the physical hardware.
Signal shapes
What each waveform changes
Sine
A smooth single-frequency reference with no added harmonic edges.
Square
A sharper shape with strong odd harmonics that can sound more pointed at the same frequency.
Triangle
A softer-edged alternative whose harmonic content falls away more quickly than a square wave.
Sawtooth
A bright, dense harmonic shape useful when you want a more complex listening reference.
No sound? Check these first.
- Confirm the browser tab and operating-system output are not muted.
- Check that the selected headphones or speakers are connected.
- Try 440 Hz with Both selected and a 5% digital level.
- Some browsers require a direct click before audio can start.
Keep the levels separate
The level control limits the digital signal generated by this page. It does not set your operating-system volume, amplifier gain, or dB SPL, so the same setting can sound different on different devices.
Common questions
Online tone generator FAQ
Does this measure speaker loudness or dB SPL?
No. It creates a digital audio signal for your output device. It cannot measure acoustic pressure, frequency response, or speaker health.
Will a shared settings link play automatically?
No. A link can restore frequency, waveform, and channel, but audio still requires an explicit Play click in the browser.
Which frequency should I start with?
440 Hz is a practical neutral starting point. Use a low digital level first, then adjust for the speakers or headphones you are checking.