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Can an iPhone camera see infrared light? Try the remote-control test

Results vary by phone: some iPhones catch a little near-infrared, plenty barely catch any. Point the back camera at a remote, press a button, watch for a purple or white flash at the tip. PrivacyScan's IR Test just gives you that live view and says outright: this is not hidden-camera detection.

3 min read · Updated 2026-09-16

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Why people try this test

Night-vision cameras light a room with infrared LEDs your eyes cannot pick up. The logic sounds reasonable: if a phone camera can see infrared, maybe it can spot those LEDs glowing too. Worth finding out whether that holds for your specific phone before you trust it in a dark room.

How an infrared remote shows it

A TV remote fires commands as pulses of infrared from the small bulb at its tip — invisible to you, but not necessarily to a sensor. A camera that lets some infrared through renders those pulses as a flickering purple or white light.

Steps: run the IR Test

  1. Open the Inspect tab and start or open an inspection, then tap Camera Tools.
  2. Keep the IR Test segment selected and tap Start Camera. Allow camera access if iOS asks; if you refused before, the app shows Camera Access Required with an Open Settings button.
  3. Point the back camera at the tip of a TV or air-conditioner remote from a short distance.
  4. Press and hold any button on the remote and watch the screen.
  5. A flickering purple or white glow means this camera sees some near-infrared. Nothing at all means it filters it out.
  6. Tap Stop Camera when you are done.

Why this does not find night-vision cameras

The screen itself spells it out in capitals: this does NOT detect hidden cameras. There is an Important Limitations card right there explaining the reasoning, and it is worth actually reading once.

  • Most iPhone cameras block 940 nm infrared, the wavelength most covert cameras use. Those LEDs stay invisible.
  • Only near-infrared around 850 nm that gets through the lens filter shows up, and even that is often faint.
  • Other infrared sources, reflective surfaces and low-light glare cause false alarms.
  • Seeing nothing is not proof that the room has no cameras.

Think of it as a reality check, not a tool. No glow from the remote means your camera definitely will not catch a covert camera's LEDs either. A faint glow means it might catch 850 nm light — but that still tells you nothing about the 940 nm band most spy cameras actually use.

Common mistakes with the remote test

  • Testing in a lit room. The IR glow is faint; dim the room the same way you would for Lens Finder.
  • Using a remote with a weak battery. A dying battery sends a weaker infrared flash, which can look like your camera filters IR when it does not.
  • Trying the front camera. IR Test only opens the back camera; a front-camera result would not tell you anything about this test anyway.
  • Treating a glow as good news about the room. A glow only describes your phone's sensor, not whether a camera is present.

What to do instead

  • Look for the lens itself with a torch in a dark room: Lens Finder, on the same screen.
  • Check the objects cameras are usually hidden in, using the checklist in Inspect.
  • Scan the Wi-Fi and Bluetooth for devices that announce themselves.

For more of the reasoning behind this, open Settings, then Read Privacy Guide and the What iPhone Can Detect article.

Questions and answers

Can a phone camera see infrared?
A little, on some phones — others filter nearly all of it out. Point yours at a TV remote: a purple or white flicker at the tip means it is catching some.
Can hidden cameras see in the dark?
Plenty can, lighting the room with infrared LEDs you cannot see. Most run at 940 nm, a wavelength your iPhone camera almost certainly cannot pick up.
My iPhone showed no glow from the remote. Is it broken?
Nothing wrong with it. It just means that camera's filter blocks that remote's infrared band entirely, which is normal and exactly why this test will never find a hidden camera.
Does PrivacyScan analyse the image for infrared?
No. It is a live view for your own eyes, nothing in the app processes the picture at all.

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