Test your speakers or headphones in seconds with this free online speaker test. Check that the left and right channels aren’t swapped, sweep the full frequency range to find dead spots, and test your bass or subwoofer — all in your browser, with nothing to install and no signup.
Speaker & Headphone Test
Test your speakers or headphones in seconds — check the left and right channels aren’t swapped, sweep the full frequency range, and test your bass or subwoofer. Everything plays in your browser; nothing is uploaded.
Left/Right: you should hear the tone only from that side — if it’s on the wrong side, your channels are swapped. Stereo sweep pans a tone side to side. Bass / sub test sweeps the low frequencies (20–150 Hz) so you can check your subwoofer or how deep your speakers go. Full sweep runs 20 Hz to 20 kHz — a quick way to spot dead spots or check the top end (and, roughly, your own hearing). Start at a low volume, especially for the bass and full-sweep tests.
The tests
- Left channel — plays a tone on the left only. You should hear it only from your left speaker or ear.
- Right channel — plays on the right only.
- Both (centre) — plays equally in both, to check balance.
- Stereo sweep — pans a tone smoothly from left to right so you can hear the stereo image move.
- Bass / sub test — sweeps the low frequencies (20–150 Hz) so you can check your subwoofer or how deep your speakers reach.
- Full sweep — runs 20 Hz to 20 kHz to reveal buzzes, dead spots or a weak top end (and, roughly, the limits of your own hearing).
How to test your speakers or headphones
- Set a low volume to start — especially for the bass and full-sweep tests.
- Run Left, then Right. If the sound comes from the wrong side, your channels are swapped (check your cables or audio settings).
- Try the bass test to hear how low your system goes and whether your subwoofer is working.
- Run the full sweep and listen for any rattles, dropouts or frequencies that suddenly disappear.
What it’s good for
- New speakers or headphones — confirm both sides work and aren’t wired backwards.
- Setting up surround or stereo — verify left/right placement.
- Subwoofer setup — check your sub actually reproduces the low end.
- Troubleshooting — quickly tell whether a problem is one channel, the bass, or the whole system.
Free, private, and fully in your browser
Every tone is generated live with the Web Audio API — nothing is uploaded and there’s no signup. Want to tune an instrument or generate a specific pitch instead? Try the Online Tuner and Tone Generator. Testing a microphone rather than output? Use the Voice Recorder.
Frequently asked questions
How do I test if my left and right speakers are correct?
Run the Left test — you should hear the tone only on the left — then the Right test. If the sides are reversed, your channels are swapped; check your cables or your device’s audio settings.
How do I test my subwoofer or bass?
Use the Bass / sub test. It sweeps from 20 Hz upward, so you can hear (and feel) how low your system reaches and whether your subwoofer is working. Start at a low volume.
What is the frequency sweep for?
The full sweep runs 20 Hz to 20 kHz. Listen for any buzzes, rattles or frequencies that drop out — and it doubles as a rough check of your own hearing range.
Does it work with headphones?
Yes — it works with both headphones and speakers. Headphones make the left/right test especially clear.
Does it upload anything?
No. The tones are generated on your device in real time; nothing is recorded or uploaded.
Is it really free?
Completely — no signup, no watermark, no limits.