Why test your wired headphone connection?
Whether you're using a traditional 3.5mm headphone jack or a USB-C/Lightning adapter, audio ports are susceptible to damage, dust, and lint buildup. A faulty headphone connection can cause audio to play out of only one ear, sound distorted, or not play at all.
Common Headphone Port Issues:
- Dust and Lint: Debris inside the port can prevent the plug from making a solid connection.
- Hardware Damage: Internal pins can get bent or worn out over time from repeated insertions.
- Software Glitches: Sometimes the phone fails to recognize that headphones are plugged in, continuing to route audio through the speakers.
- Adapter Failure: USB-C or Lightning to 3.5mm adapters often break internally before the phone's port does.
Left and right channel check
The left / right buttons send a tone to one channel only, with nothing at all in the other. Put the headphones on and press Left: you should hear it only in your left ear. Then try Right, then Both, which should sound centered.
- Sides swapped: check the L and R marks on the earbuds. If they are worn correctly, a setting may be swapping them (some Android phones have a channel balance or swap option under accessibility or sound settings).
- Sound in both ears for Left or Right: Mono audio is turned on. On iPhone it is under Settings → Accessibility → Audio & Visual; on Android, search Settings for "mono audio".
- One side silent or much quieter: check the balance slider in the same accessibility settings, clean the earbud mesh, and try another pair. If every pair has the problem, the jack, adapter or port is the likely cause.
- Sound cuts out when you wiggle the plug: a worn jack, a failing adapter, or lint in the port. Look inside with a torch and clear lint with a wooden toothpick, never metal.
How this test works
This tool plays a standard test tone (A4 note, 440Hz). Because web browsers have privacy restrictions, they cannot definitively tell if the audio is successfully routing to your physical headphones. Therefore, we rely on your manual confirmation to verify if the sound successfully played through the headphones instead of the main speaker. We also attempt to read available audio output devices to give you more context about what your browser sees.
Frequently asked questions
Why are my wired headphones not working on my phone?
Check that the plug is fully inserted and not blocked by a case, clean lint from the jack or USB-C port, and disconnect any Bluetooth audio devices, which take priority. Try another pair of headphones to find out whether the phone or the headphones are at fault.
Do USB-C headphone adapters work with every phone?
Not always. Adapters with a built-in DAC work with nearly all USB-C phones, including iPhone 15 and newer and Google Pixel. Cheap passive adapters only work with phones that send analog audio through the USB-C port, so look for "DAC" in the product listing.
Why does audio only play in one ear?
A partially inserted plug, a damaged cable near the connector, or Mono Audio or balance settings in accessibility can cause one-sided sound. Our left/right tones show which channel is missing.
Which phones still have a headphone jack?
Most flagship phones from Apple, Samsung and Google have dropped the 3.5 mm jack, but many budget and mid-range Android phones, such as some Motorola moto g and Samsung Galaxy A models, still include one.