Browser sound output · nothing is recorded

Sound test

Send a test signal to your speakers or headphones: one channel at a time to check left against right, a steady tone at a frequency you pick, or a sweep across the audible range. Your ears make the call, the browser only sends the signal.

Play a test signal and listen

Nothing is playing

Output volume50%

Stop is available in every state, and the Esc key does the same thing.

Check left, right and both

Play one side at a time. Both sides should sound the same, and the side you hear should be the side named on screen.

Choose a side to start

If the sound arrives from the other side, something swaps the channels: the cable, the connector, the system settings, or how the headphones are being worn. This page cannot tell which, and it has no way to know whether you have them on the right way round.

A steady tone at the frequency you choose

Low frequencies show whether anything reaches a woofer at all. High ones are where small speakers, and older ears, usually give up.

Common frequencies

Waveform

Custom frequency20 to 20000 Hz

Current tone1 kHz

WaveformSine

Sweep the audible range

The frequency climbs from the bottom of the range to the top without stopping, so a band that drops out is easy to notice.

Length

Range20 Hz → 20 kHz

Now at—

Progress—

A dip you hear belongs to this speaker, in this room, through this browser. It is not a frequency response measurement, and it says nothing about your hearing.

What the browser reports

Sample rate—

Output channels—

Shown after the first playback

These are values the browser reports for the current output device, not your speaker specification. They can change when you plug in headphones or switch output device.

This tool only confirms that audio was handed to the system output. What the speaker actually produced is something no web page can read back.
Nothing here measures loudness, frequency response, distortion or sound pressure. Those need a calibrated microphone and a controlled room.
This is not a hearing test. Hearing tests are a medical procedure; if you are worried about your hearing, see a professional rather than reading anything into a sweep.
The left and right result depends on the headphones being worn the right way round. If they are swapped on your head, this page has no way to know.
On iPhone and iPad the physical silent switch mutes everything while the browser still reports that playback is running. If you hear nothing there, check that side switch before you blame the speaker.
Browsers only allow audio after a click, so the audio engine starts with your first playback and the reported values appear then.