Headphone Test
StereoFree online headphone test and headphone tester — left/right channel check and stereo separation.
Everything runs in your browser. Nothing is uploaded.How to use the Headphone Test online
- 01 Put your headphones on the correct way round (L on left).
- 02 Start the test and answer each guided prompt honestly.
- 03 Confirm the left-only and right-only tones land in the right ear.
- 04 Check both ears sound equal in level (balance).
- 05 Listen to the L→R pan for smooth stereo separation.
Common problems & fixes
- Left/right swappedCheck the headphone orientation, then the balance slider in Sound settings → Properties.
- One side quieterReset the L/R balance to center; if it persists the driver may be failing.
- Mono audio is onSystem Settings → Accessibility → Audio, and turn off Play stereo audio as mono.
- Balance offSound → Output → Balance; drag back to the middle.
- No stereo separationConfirm the profile is not set to mono in pavucontrol and the app is not down-mixing.
Related checks
While you are here, you can also run the same balance check through speakers, see whether the mic still picks up your voice, or check charge level before a long listening session.
Working through the whole category? Browse all audio tests in one place.
Frequently asked questions
Run the L/R test on this page. If one side is silent here too, it is usually the cable, jack, Bluetooth balance, or driver — not the webpage. Full walkthrough: headphone jack not working.
Use the left/right isolation tones, then check mono/stereo balance in your OS sound settings.
This free headphone checker runs left/right isolation tones for stereo imaging and channel balance. Any stereo pair your OS routes here works — it is not a lab THD measurement.
Yes — the guided prompts play a left-only tone and then a right-only tone, so this doubles as a left right audio test: confirm each earcup first, then check balance and the L→R pan.
Confirm the physical cable orientation and OS balance. If the test plays Left and you hear it on the right, the channels are reversed in hardware or the OS mixer.
No. Tones are generated locally and never leave your device.