Speaker & Headphone Test
FreeTest your speakers and headphones right in the browser: left/right channel checks, a stereo test, a bass tone, and a 20 Hz to 20,000 Hz frequency sweep, all generated live with the Web Audio API.
Runs entirely in your browser. Every tone is generated live with the Web Audio API; no audio file is ever downloaded or uploaded, and no microphone access is requested.
Channel & Frequency Tests
Frequency Sweep
20 Hz to 20,000 Hz, both sides
Current frequency: -
Speaker Indicators
Lights up on the side currently playing sound.
Recent Activity
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How to Test Your Speakers and Headphones Online
Testing your audio setup takes about a minute. Put your headphones on or turn your speakers up to a comfortable level, then work through the panel above: click Left Channel Check first, and you should hear the 440 Hz tone only in your left ear or left speaker. Click Right Channel Check next and confirm the sound switches sides. Stereo / Both Channels checks that the same tone plays evenly on both sides at once, Bass / Low Frequency drops to 60 Hz to check whether a speaker or subwoofer actually reproduces low end, and Frequency Sweep glides from 20 Hz up to 20,000 Hz over a few seconds so you can hear where a speaker's range starts to thin out.
The volume slider and Stop button work at any point during a test, and the two speaker icons light up on whichever side is currently making sound, so you don't have to guess which test is running or second-guess what you're hearing.
Why Left/Right Audio Channel Testing Matters
A surprising number of audio problems come down to one channel being silent, swapped, or quieter than the other, and it's easy to miss because your brain fills in the gap when you're listening to normal music or a video call. A loose 3.5mm jack, a bad solder joint in a cheap cable, a Bluetooth pairing glitch, or a muted channel buried in your OS's audio settings can all cause it, and none of them are obvious until you play something that's supposed to come from one specific side.
Testing left and right in isolation, rather than together, is what actually reveals the problem. If you only ever listen to stereo audio, a dead right channel can hide behind a healthy left one indefinitely, right up until you notice half your call audio has been missing the whole time.
Problems it solves
- Figuring out whether new headphones have a dead or swapped left/right channel before you decide to return them.
- Checking whether a secondhand or older speaker still reproduces bass, not just mids and highs.
- Confirming a Bluetooth pairing or aux cable hasn't reversed which channel plays on which side.
- Testing a conference room or event speaker system's frequency range before people show up.
- Quickly checking your headphones work in both ears right before a call, instead of finding out mid-meeting.
Frequently Asked Questions (FAQ)
›Does this tool need access to my microphone?
No. It only plays sound through your speakers or headphones; it never records or listens to anything, so your browser won't even show a microphone permission prompt.
›Why do I only hear sound in one ear during the Left or Right test?
That's the test working correctly. Left Channel Check sends the tone only to the left output and Right Channel Check sends it only to the right, so you can confirm each side independently instead of relying on stereo music, where a quiet or missing channel is easy to miss.
›What's the difference between the sweep test and the fixed-frequency tests?
Left, Right, Both, and Bass each hold one steady tone so you can focus on a single thing, which channel, or how low the bass goes. The Sweep test instead glides continuously from 20 Hz to 20,000 Hz over a few seconds, which is better for hearing where a speaker's output starts to fade at the very low or very high end of its range.
›I can't hear the bass tone or the start of the sweep. Is something broken?
Not necessarily. Small laptop and phone speakers physically can't reproduce frequencies much below 100 to 150 Hz no matter how healthy they are, so silence during the 60 Hz bass test on a phone speaker is normal. On a proper speaker system or headphones with real bass drivers, though, you should feel or hear something even at 60 Hz.
›Is 20 Hz to 20,000 Hz really the full range of human hearing?
It's the commonly cited range for young, healthy ears. Most adults lose some sensitivity at the very top of that range over time, so not hearing the last second or two of the sweep at the highest frequencies is common and not a sign your speakers are broken.
›Does this work with Bluetooth headphones and speakers?
Yes, as long as the device is already connected and selected as your system's audio output, the browser just plays sound through whatever output your OS is currently using. Bluetooth audio can add a small delay, but the channel tests themselves work the same way.
›Can this tell me if a speaker driver is physically damaged?
It can point you in the right direction. Silence or heavy distortion on one channel during these tests usually means a real problem, a bad cable, a blown driver, or a wiring fault, rather than a setting. It's not a full diagnostic, but it's usually enough to tell you which side to investigate.
›Why is there a volume slider here instead of just using my device's volume?
The slider controls the tone's output level directly on the page, which is handy for starting quiet and turning up slowly, especially for the higher frequencies in the sweep test, which can sound sharper than music at the same volume. Your device and system volume still apply on top of it.
›Does this work on mobile phones?
Yes. The layout adapts to smaller screens, and the tests work the same way over a phone's built-in speaker, wired headphones, or Bluetooth audio, keeping in mind that small phone speakers won't reproduce very low bass regardless of the device.
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