Speaker & Audio Test

What this tool does

The Speaker & Audio Test plays a controllable test tone so you can confirm your speakers or headphones work and that the stereo channels are mapped correctly. You can send the tone through the left channel only, the right channel only, or both at once; choose a low, mid or high frequency or sweep anywhere from 20 Hz to 16 kHz with a slider; and adjust the volume. A simple visual shows which channel is currently playing.

It needs no permissions. The tone is synthesised entirely in your browser with the Web Audio API, it plays only when you press a button, and nothing is ever recorded or uploaded.

When you’d use it

A quick speaker check is handy in many situations:

• Before a video call or presentation — make sure you will hear other people, so you are not silently missing the conversation.
• After plugging in new speakers or headphones — confirm both sides work and the channels are not reversed.
• When sound comes from only one side — isolate whether the issue is the left or the right channel.
• Checking a surround or stereo setup — verify each speaker is wired to the channel you expect.
• Testing the frequency range — the sweep lets you check whether your speakers reproduce bass and treble, and is a casual way to gauge the top of your own hearing.

How to use it

1. Set the volume low. Drag the volume slider down before you start, then raise it gradually — a sudden tone can be harsh, especially on headphones.
2. Choose a channel. Press Left only, Right only or Both channels. The tone starts immediately and the on-screen panels light up to show which side is playing.
3. Check the mapping. With “Left only”, sound should come only from your left speaker, and the same for the right. If they are swapped, your cables or settings are reversed.
4. Pick a frequency. Use the Low, Mid and High presets, or drag the frequency slider to sweep the full range and listen for gaps.
5. Adjust as you go. The volume and frequency sliders update the tone live while it plays.
6. Stop the tone. Press Stop tone to silence it at any time.

How to read the results and fix problems

If you hear the tone clearly from the expected side, your speakers and channel mapping are working — that is the result you want. If you hear nothing at all, the problem is almost always outside this tool: the system volume is down or muted, the wrong output device is selected, or headphones are not fully plugged in. Check those first and try again.

If only one side plays, swap to the other channel to confirm, then look at the cable for the silent side, your audio balance setting, and the driver. If the channels are swapped, correct the cables or the channel order in your sound settings. If only the highest frequencies are faint or silent, that is often normal — small speakers and older ears both roll off the top end — so judge your speakers mainly on the low and mid tones.

Browser compatibility

The test uses the Web Audio API, which is supported by current versions of Chrome, Edge, Firefox and Safari, including Safari on iOS. Browsers require a user gesture before audio can play, which is why the tone starts only on a button press. No secure-connection restriction applies, but this site uses HTTPS regardless.

For a complete audio and video check, also run the Microphone Test and the Webcam Test. To capture sound rather than play it, see the Voice Recorder, and Browser Info reports what else your browser supports.

The test tone is generated only in your browser, plays only on your command, and nothing about your audio setup is recorded or uploaded.