Choose the Test Signal
Select a preset such as 1 kHz or enter a custom frequency, then choose the waveform and test duration.
Test signal setupLocal audio
Ready — sound is off
Hz
Quick frequencies
Frequency440 Hz
Period2.273 ms
WaveformSine
Nearest noteA4 · +0 cents
Wavelength at 20°C≈ 78.0 cm
TimeManual
Browser audio signal toolkit
Online Test Tone Generator
Configure a repeatable reference signal with a known frequency, waveform, channel, level, and playback duration for practical audio-path checks.
What Is a Test Tone Generator?
A test tone generator creates a controlled audio signal for checking whether a playback path behaves as expected. Instead of presenting a broad synthesizer, this page centers on repeatable setup: choose a common preset or custom frequency, select a waveform, route it left, right, or center, then run it continuously or for a defined 1-, 3-, 5-, 10-, or 30-second interval.
The signal is generated locally with Web Audio and starts only after Play Test is pressed. Timed playback stops automatically and shows elapsed time. The same settings can produce a local PCM WAV. This test tone generator is useful for tracing obvious routing and playback issues, but it is not a calibrated meter, electrical standard, speaker certification system, or hearing test.
Three simple steps
How to Get Started
Use this test tone generator deliberately: set the signal, begin quietly, and interpret only what the workflow can actually show.
Set Channel and Level
Route the signal left, right, or center and begin with both the browser and equipment volume low.
Run and Observe
Press Play Test, watch the timer, note what happens in the audio path, or export the same timed signal.
Common Test Tone Frequencies and What They Are Used For
Common checkpoints provide convenient repeatability rather than universal pass/fail thresholds. A 100 Hz tone can exercise bass reproduction, 250 and 500 Hz cover lower midrange regions, 1 kHz is a familiar general reference, and 2, 5, or 10 kHz sample progressively higher areas. The 15 and 20 kHz presets approach the upper edge for many listeners and devices and demand special restraint.
Use the test tone generator to change one parameter at a time. If a signal disappears on one channel, swap or inspect the relevant routing before drawing conclusions. If one frequency seems quieter, consider transducer response, room cancellation, processing, source level, and hearing. A single listening result does not prove a defect or a specification.
1 kHz Test Tones
A 1 kHz test tone sits in a region that most ordinary playback systems can reproduce, which makes it a practical first signal for confirming that an audio path is active. Its period is exactly 1 millisecond. Select sine for a simple reference, keep the output low, and test both channels before moving toward more demanding bass or treble settings.
One kilohertz has no magical quality and does not independently calibrate a system. A percentage in this browser does not correspond to a defined voltage at an analog connector or to a sound-pressure level in a room. Formal alignment procedures specify signal level, load, metering, and equipment. This browser test tone generator supplies a convenient digital source only.
Using Left, Right, and Both Channels
Channel selection helps confirm basic stereo routing. Start with the center setting to establish that sound is present, then choose Left and Right separately. Listen for the expected side and stop between changes if the system is loud. A swapped result may come from cables, an interface, application routing, operating-system settings, or the speaker arrangement.
Stereo panning is handled through Web Audio when the browser supports it. Center sends the signal through the stereo path rather than claiming a calibrated equal acoustic level from both speakers. Speaker position, gain, distance, and room reflections may make one side sound different even when the digital setting is centered.
Test Tones for Troubleshooting an Audio Path
A controlled sequence makes troubleshooting easier. Confirm system volume and output selection, play a low-level 1 kHz signal through both channels, then test each side. Move to another frequency only after basic routing works. If a problem appears, repeat the same timed tone while changing one cable, setting, or component at a time.
The test tone generator can reveal symptoms such as silence, intermittent playback, channel reversal, buzz that appears at one setting, or obvious distortion. It cannot locate the cause by itself. Record your observations separately and use appropriate electrical or acoustic instruments if the issue requires measurement rather than a listening check.
What a Browser Test Tone Can and Cannot Tell You
The browser can schedule a digital oscillator frequency, gain, duration, and stereo pan. The timer gives a clear interval, and the analyser canvas confirms that a time-domain signal exists inside the Web Audio graph. These features support repeatable comparisons within the same setup. They do not measure the analog connector, amplifier output, room response, or sound pressure.
A quiet frequency does not necessarily mean a damaged speaker. A loud rattle does not identify which object is vibrating. A missed high tone does not diagnose hearing loss. Quantitative frequency-response work requires a calibrated microphone, known stimulus, measurement software, controlled placement, and careful interpretation. The test tone generator should be treated as an input source and guided observation tool.
Who Uses Test Tones?
Audio technicians use defined signals while tracing systems, although professional work generally relies on calibrated generators and meters. Musicians and home-studio users can perform quick channel checks. Teachers can show how waveform and frequency change the signal. Developers can verify playback flows, and equipment owners can reproduce an intermittent symptom with a fixed duration and setting.
The workflow also makes exported files consistent: a five-second 1 kHz sine can be used again in another local player. That repeatability is useful, but the receiving application and hardware may change gain or process the file. Document settings whenever comparison matters and avoid presenting subjective listening as a formal certification.
Listening Safety and Equipment Caution
Begin every test at a low device volume and a low digital level. Fixed tones can be tiring, and high or prolonged exposure can damage hearing. Upper-frequency signals may feel less loud than they are, while low tones can demand substantial driver movement. Never raise level suddenly to make an edge-of-range tone audible. Stop immediately at discomfort, strain, or unexpected distortion.
Use short timed playback where possible. Confirm that connected inputs can safely accept the signal, and keep power amplifiers and sensitive transducers within their operating limits. This test tone generator provides no automatic protection against every downstream gain setting. The user remains responsible for equipment, listening duration, environment, and safe operating level.
Exporting Repeatable Test Signals
WAV export uses the chosen frequency, waveform, duration, digital level, and stereo position. Encoding happens in the browser and creates a deterministic filename, so no upload or remote rendering is involved. Short fades are written at the edges to reduce abrupt waveform discontinuities. Exporting does not start audible playback.
A WAV file preserves sample values, not a guaranteed acoustic result. Players can apply their own volume or processing, and devices differ. Use the file as a convenient source for compatible workflows, not as a claim of calibrated voltage, dB SPL, distortion, or frequency response. The full disclaimer explains those boundaries in more detail.
Clear answers
Frequently Asked Questions
What is a good first test tone?
A low-level 1 kHz sine is a practical first routing check because ordinary playback systems generally reproduce it. It is not a universal calibration signal unless a complete procedure defines the level and measurement method.
Can a test tone prove my speakers are accurate?
No. Listening can reveal obvious symptoms, but quantitative accuracy requires calibrated measurement equipment and a defined environment.
What does timed playback do?
Choose 1, 3, 5, 10, or 30 seconds and the signal stops automatically after that interval. Continuous mode runs until you press Stop.
Can I test one stereo channel?
Yes. Use the left or right balance shortcut. The result checks routing through the current system; it does not measure equal acoustic output from the two speakers.
Is this a hearing test?
No. Audibility depends on the playback chain and listener, and this page does not diagnose hearing.