Use your cell phone’s camera to find infrared (IR) lights from hidden cameras by pointing it at suspected objects in a dark room. 85% of hidden cameras emit IR that can be seen through a phone camera. Then scan for radio frequencies using a free app.
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Your cell phone’s camera can detect infrared (IR) light that many hidden cameras emit. Turn off the room lights, open your phone’s camera app, and scan the area slowly. Look for a tiny pink or white glow on the screen—this is the IR light from a camera lens. Most consumer hidden cameras use IR for night vision, making them a budget provider through a phone camera. This method works best with the rear camera; the front camera may have an IR filter that reduces detection. For thoroughness, also use the front camera in low-light mode.
Scan for Radio Frequency Signals
Many hidden cameras transmit video wirelessly, emitting radio frequency (RF) signals. Download a free RF detector app from your phone’s app store—these apps use your phone’s built-in RF sensor to detect nearby transmissions. RF detection apps can locate signals up to 20 feet away. Walk slowly around the room, holding your phone at chest level. If the app’s signal strength spikes, investigate the object near that spot. Note that RF scanners may also pick up Wi-Fi routers and Bluetooth devices, so compare readings to a known baseline.
| Object | Expected RF Level |
|---|---|
| Wi-Fi router | Moderate, steady |
| Bluetooth speaker | Low, intermittent |
| Hidden camera transmitter | High, pulsing |
Check for Lens Reflections
Camera lenses reflect light even when the camera is off. Use your phone’s flashlight to illuminate suspicious objects from different angles. Look for a tiny, bright glint that is not a normal reflection from glass or metal. Common surfaces to check include smoke detectors, alarm clocks, wall outlets, air vents, and decorative items. Hover the flashlight close to the object and slowly move your head while watching the reflection. If you see a pinprick of light that remains stationary, it may be a camera lens. Perform this check in a dark room for best results.
Inspect Suspicious Objects
Hidden cameras are often disguised as everyday items. Use your phone’s camera to zoom in on objects that seem out of place or have small holes where a lens could fit.
- Smoke detectors: Look for a tiny pinhole on the side or bottom.
- USB chargers: Check for a small lens near the LED indicator.
- Clocks and radios: Examine the glass face for a concealed dot.
- Stuffed animals: Squeeze them to feel for hard objects.
- Pen holders and plants: Look for wires or unusual shapes.
Use Dedicated Detection Apps
Several mobile apps are designed specifically to help find hidden cameras. These apps combine multiple detection methods:
- IR light detection using the camera’s sensor.
- RF signal scanning via the phone’s radio.
- Magnetic field detection using the phone’s magnetometer.