Why a camera pointed through a window goes white at night

An indoor camera watching the drive is the cheapest outdoor camera there is, right up to the moment the sun goes down. Then the picture turns into a gray-white sheet with your own room faintly visible in it. Two things cause that, and the second one is worse because it fails silently.

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An indoor camera on a windowsill looking out at a driveway at dusk
Through glass, an indoor camera is the cheapest outdoor camera there is, right up until the sun goes down.
Problem two, and it is the reason to read this before buying anything

A passive infrared motion sensor cannot see through glass at all. Glass blocks the long-wavelength infrared that body heat radiates, so a camera that detects motion with a PIR sensor will sit behind a window and detect nothing, all night, with no error and no warning. Only cameras using image-based motion detection work in this position. If you are buying a camera specifically to point out of a window, this decides the purchase.

Turn infrared off

Most cameras let you disable night vision. If there is a street lamp, a porch light or any usable outdoor light, the camera will do far better with the infrared off and the ambient light on than it ever will fighting its own reflection. Try this before anything else, because it costs nothing and it is usually the whole answer.

Put the lens flat against the glass

Reflection needs an air gap. A lens pressed right up to the pane, with the LEDs against the glass or shrouded, has nowhere to bounce. Suction mounts designed for this exist and are the reason purpose-built window cameras look the way they do.

Kill the light behind the camera

Close the door, turn the lamp off, drop a blind behind the unit. Any of these removes a reflection you are otherwise fighting with settings.

Put the camera outside instead

This is where a lot of these setups end up. Glass costs you infrared, costs you PIR motion detection, and adds reflections on every pane. A weatherproof camera on the wall has none of those problems, and if the obstacle is running power, that is a smaller job than it sounds.

Window camera on an angled base at a windowsill, lens turned toward the glass
Window camera

2K window camera with angled mount

A camera built for the window position instead of adapted to it, mounted at an angle so the lens meets the glass without shooting its own reflection. Confirm it uses image-based motion detection. Glass blocks the far-infrared a passive infrared sensor looks for, so a PIR-triggered camera will not sense movement through a window the way it does outdoors.

Camera on a suction mount at a window, yard visible beyond
Window mount

Rotating suction window mount for cameras

A suction cup and an articulated arm that hold a small camera at the window and let you aim it. The adjustable joint is the whole point, because a camera set square to the pane tends to photograph its own reflection. Universal means one of two fittings, so check yours before ordering. Either a 1/4 inch screw socket, or a body the clamp can grip between 2.16 and 4.13 inches. Turn the camera's night vision off whatever mount you use, since infrared bounces straight back off glass.

Indoor camera in a shaped suction cradle at a window, street visible beyond
Window mount

No-drill window mount for Ring Indoor Cam, 2-pack

A suction mount shaped for one specific camera, which is the trade against a universal bracket: it fits properly or not at all. The listing is firm that it is single-pane glass only, which rules out a double-glazed window before anything else does. Two in the pack, useful because the good pane is rarely the first one you try, and the suction leaves nothing behind when you move it.

Recording a public street from your own property is generally accepted, and the questions that matter are about what else the camera captures, like a neighbor's window or yard, and whether it records audio, which is treated more strictly than video in many places. Rules vary by state and sometimes by city. This page is not the place to get a legal answer; check your own state's recording law, and ask a lawyer if the answer matters.
Yes, and it is the cheapest version of the flat-against-the-glass fix. Anything that stops the infrared reaching the pane, or stops the reflection reaching the lens, is working on the right problem.
It usually just disables the infrared, which is the first fix on this page done for you. Useful, and not magic.
The same reflection problem, at the front door instead. That one is covered on the washed-out night vision page, and the answer there is also to change the light rather than the camera.