Can Phone Cameras See Infrared?

Yes, but only partially, and the honest answer depends on which camera on your phone you mean. Your phone's regular rear and front cameras can technically detect a small amount of near-infrared light, which is why a TV remote's blinking LED shows up as a faint purple-white glow on screen even though it's completely invisible to your eyes. But manufacturers deliberately block most of that infrared light with a filter, specifically so it doesn't distort your everyday photos. Meanwhile, some phones have an entirely separate, dedicated infrared camera built for facial recognition that genuinely does see infrared as its primary job, not as a leftover side effect.

This article breaks down the real difference between these two situations, why the remote-control trick actually works, and what phone cameras genuinely cannot do, no matter what a viral video claims.

Why Your Main Camera Sensor Is Naturally IR-Sensitive

The sensor inside your phone's camera, whether CMOS or a similar type, is a light-detecting chip that doesn't inherently distinguish between visible light and near-infrared light the way your eyes do. Left completely unfiltered, these sensors would pick up a meaningful amount of near-infrared radiation alongside the red, green, and blue light needed to build a normal color photo.

This isn't a flaw or a workaround; it's simply a property of the semiconductor material these sensors are built from. The same physical characteristic that lets a sensor efficiently capture visible light happens to extend a bit further into the invisible near-infrared range just past red light on the spectrum.

Left uncorrected, this extra infrared sensitivity would make photos look wrong. It typically introduces a reddish or washed-out color cast, since infrared adds signal to the sensor's red channel specifically without actually representing anything the human eye perceives as color. This is exactly the kind of distortion manufacturers need to eliminate for photos to look accurate.

This same underlying sensitivity is actually useful in other contexts, which is part of why it's built into the hardware rather than eliminated at the sensor level entirely. Security cameras designed for night vision deliberately keep this infrared sensitivity active and switch their own IR-cut filter out of the light path in low light, pairing it with infrared illuminators to produce a usable black-and-white image in complete darkness. Your phone's camera has the same underlying capability sitting dormant behind its filter; it's simply configured for accurate daytime color rather than night vision.

The IR-Cut Filter: Why Photos Still Look Normal

To solve this, phone manufacturers install a small optical component called an IR-cut filter directly in front of the image sensor, inside the camera module itself. This filter is specifically designed to block most infrared wavelengths while letting visible light pass through largely untouched, which is what allows your phone to produce naturally colored photos instead of images with a persistent reddish tint.

The word "most" matters here. IR-cut filters are effective but not perfect, and a small amount of near-infrared light typically still gets through. Under normal daylight conditions, this residual leakage is negligible enough that you'd never notice it in an ordinary photo. It only becomes visible in situations with a concentrated, direct infrared source pointed straight at the lens — which is exactly what a TV remote's IR LED is.

Why the TV Remote Trick Actually Works

Point almost any phone's rear camera at a working TV or air conditioner remote, press a button, and you'll typically see a faint glow on your screen where the invisible IR LED is emitting. This isn't a special hidden feature; it's simply the small amount of infrared light that leaks past the IR-cut filter, made visible because you're looking at a small, bright, concentrated infrared source rather than the diffuse infrared present in ordinary daylight.

This works as a rough, informal way to check whether a remote's battery and LED are actually functioning, since a dead remote won't produce any glow at all. It isn't a reliable scientific test, and results can vary slightly between phone models depending on how effective that specific device's IR-cut filter is, but the basic principle holds across virtually every modern phone camera.

Face ID and True Depth: A Genuinely Different Camera

This is where the picture gets more interesting, and where a lot of confusion about "phone cameras seeing infrared" actually comes from. According to Apple's own support documentation, the True Depth camera system used for Face ID captures an actual infrared image of your face, separate from the regular front-facing photo camera used for selfies and video calls.

This system uses a dedicated infrared camera alongside a dot projector that casts more than 30,000 invisible infrared dots across your face, and a flood illuminator that bathes your face in infrared light so the system works consistently regardless of ambient lighting, including in complete darkness. Unlike your phone's main camera, this infrared camera has no IR-cut filter working against it, because seeing infrared is its entire purpose rather than something being deliberately minimized.

This is a fundamentally different piece of hardware from the camera you point at a landscape or a friend's face for a normal photo. It doesn't capture color, doesn't produce a photo you can view in your gallery, and exists specifically to build a depth map and authenticate your identity, not to take pictures.

This also explains why Face ID reliably works in a completely dark room, something your regular camera obviously can't do without a visible flash. Since the flood illuminator provides its own infrared light source and the dedicated camera is built to see it clearly, ambient visible light becomes almost irrelevant to the whole process, unlike ordinary photography where usable light is the entire foundation of a good shot.

What Phone Cameras Still Cannot Do

• Thermal imaging is a different technology entirely. The near-infrared light your phone's main sensor faintly detects is a completely different part of the spectrum from the long-wave infrared that thermal cameras use to visualize heat. Seeing body heat, detecting warm objects in the dark, or generating the colorful heat-map images associated with thermal cameras requires a dedicated thermal sensor, an entirely separate piece of hardware that most phones don't include at all. A small number of specialized phone models and clip-on attachments add this capability, but it isn't something your phone's regular camera can do on its own, regardless of any setting.
• Night mode doesn't use infrared either. This is a common point of confusion, since both involve seeing better in the dark. Night mode works by taking a longer exposure, often combining several frames captured over one to several seconds, to gather more visible light rather than switching to any kind of infrared sensing. It's a fundamentally different mechanism from both the residual IR sensitivity in your main camera and the dedicated infrared system used for Face ID.
• See-through clothing claims are exaggerated at best. Certain fabrics can appear slightly more translucent under strong, direct infrared exposure due to how some synthetic materials interact with near-infrared wavelengths, an effect occasionally demonstrated with specialized IR-pass filters and modified cameras with the IR-cut filter physically removed. A standard, unmodified phone camera, with its IR-cut filter still in place, doesn't have anywhere near the infrared sensitivity needed to produce this effect in any meaningful way.

Frequently Asked Questions

Can I see infrared light with my phone's camera?

To a limited degree, yes. Your phone's main camera sensor has some natural sensitivity to near-infrared light, though most of it is blocked by an IR-cut filter. A concentrated source like a TV remote's LED is bright enough that the small amount of leaking infrared becomes visible on screen.

Why does my TV remote show a light on my phone camera but not with my eyes?

Your eyes can't perceive near-infrared wavelengths at all, while your phone's camera sensor has some residual sensitivity to them even with an IR-cut filter in place. The remote's LED is genuinely emitting light; you simply can't see it directly, only through a camera sensitive enough to register the small amount that gets through.

Does Face ID's infrared camera work the same as my regular camera?

No. It's a separate, dedicated camera built specifically to see infrared, with a flood illuminator and dot projector to support it, and no IR-cut filter working against it. Your phone's main photo camera is built to minimize infrared for accurate color, which is the opposite goal.

Can my phone camera see body heat like a thermal camera?

No, not without an add-on thermal sensor. The infrared your phone's regular camera faintly detects is near-infrared, a different part of the spectrum from the long-wave infrared thermal cameras use to visualize heat, and most phones don't include the specialized hardware needed for genuine thermal imaging.

Does removing my phone's screen protector or lens cover improve infrared sensitivity?

No. The IR-cut filter that limits infrared sensitivity is built into the camera module itself, in front of the sensor, not into any external screen protector or lens cover. Removing an external accessory has no effect on how much infrared light reaches the sensor.

Two Different Cameras, Two Different Jobs

Your phone's regular camera can technically pick up a small amount of infrared light, which is why the classic TV remote test works, but that's a limitation manufacturers actively fight against with an IR-cut filter, not a feature they built in. The dedicated infrared camera powering Face ID is the real exception, a genuinely separate piece of hardware designed from the ground up to see infrared as its primary function rather than as an unwanted side effect to minimize.

Next time someone claims phone cameras can secretly see through walls or detect body heat, it's worth remembering that the only infrared your phone reliably sees on purpose is the narrow, specialized system built for unlocking your face, not the everyday camera pointed at the world around you.