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Headphones only working on one side

Use the left/right test to see which side is silent, then find out whether it is software, the plug or the headphones.

First, test it.
The speaker test shows in seconds whether the device works at all — that decides which steps below apply.
Open the speaker test

Start with the left / right speaker test while wearing the headphones. Then try a second pair of headphones in the same device: if both pairs lose the same side, the device (balance, jack) is at fault; if only one pair does, it is the headphones.

  1. Audio balance is off-centre. Windows 11: Settings › System › Sound › click your output device › Left/Right balance sliders. macOS: System Settings › Accessibility › Audio › Balance, drag to the middle. iPhone: Settings › Accessibility › Audio & Visual › Balance slider (and turn off Mono Audio unless you want it). Android: Settings › Accessibility › Hearing enhancements (or Audio adjustment) › Left/right sound balance.
  2. The plug is not fully in. A 3.5 mm plug must click all the way; a case or thick cover can stop it. Push firmly and listen for the click.
  3. Dirt in the jack. Lint in the socket keeps the plug a millimetre out and kills one channel. Shine a light in; gently remove fluff with a wooden toothpick or a blast of compressed air (never metal).
  4. Wrong plug type. Headphones with a mic use a 4-ring TRRS plug; some older or aviation devices expect 3-ring TRS. A TRRS→TRS adapter fixes missing channels on those.
  5. Cable break. Wiggle the cable near the plug and near each earpiece while playing the test tone. Sound that crackles or returns means a broken wire — replaceable on headphones with detachable cables.
  6. Bluetooth earbuds: one bud not connected. Put both buds in the case, wait 10 s, take both out together. If one is still silent, forget the device in Bluetooth settings and re-pair; many earbuds have a reset (hold the case button 15 s) — check the manual. Also check each bud is charged.
  7. Blocked driver mesh. Earwax and dust on an earbud’s mesh muffle one side. Clean gently with a dry soft brush or the cleaning tool; never poke the mesh with pins.
  8. The source is mono or panned. Some videos or voice messages are recorded on one channel. Play our test tone, which is stereo: if both sides work here, the recording was the problem.

Did it work?

Run the speaker test again. If the device now registers here, every app that has permission will see it too.

Related guides

No sound from speakersPlay the test tone, then follow the list

Questions, answered

One side works only when I twist the plug.

Classic cable break at the plug, or a worn socket. Try the headphones on another device: same fault → headphones; fine → the socket.

Only one AirPod plays.

Put both in the case, check both charge lights, re-pair. In Settings › Accessibility › Audio & Visual make sure the balance slider is centred and Mono Audio is off.