DeviceCheck Pro

Webcam test

See your camera live and find out what it really delivers: resolution, frame rate and whether your lighting works. The video never leaves this page.

Webcam
IdleTestingPassFault

Your browser will ask for camera permission.

–delivered resolution
–frames per second (measured)
–max the camera reports
–average brightness (0–255)

Ask for resolution

Explainer

Why a dim room makes your webcam choppy

A camera builds each frame by letting light fall on its sensor for a moment: the exposure time. At 30 frames per second, each frame can be exposed for at most 1/30 of a second (33 ms). In a dim room the camera needs longer than that to collect enough light, so its automatic exposure lowers the frame rate to buy time, then adds electronic gain, which is where the grain comes from.

Move the light level and watch what the camera has to trade away. The numbers are a simplified model of a typical laptop webcam, not measurements of yours.

1/75 sexposure per frame
30max frames per second
1×extra gain (grain)

Enough light for a smooth 30 fps.

What the readings mean

ReadingWhat to expect
ResolutionLaptop cameras: usually 1280×720 or 1920×1080. External USB webcams: 1920×1080 is typical, 3840×2160 on 4K models.
Frame rate30 fps is standard for calls; 60 fps on some streaming webcams. Below about 20 fps looks jerky, and usually means low light or a busy USB bus.
BrightnessA well-lit face lands roughly in the middle of the range. Very low values mean the camera is stretching exposure time.

The frame rate uses requestVideoFrameCallback, which counts the frames the camera actually delivers. Firefox doesn’t support it yet, so there the counter shows screen repaints instead and can read higher than the camera.

Every pixel on your webcam sensor is a tiny light catcher. Chlorophyll is nature’s version, and ahaboo has a narrated explainer on how photosynthesis puts that captured light to work.

Quick fixes for a better picture

  • Put the light in front of you, not behind. A window behind you turns your face into a silhouette.
  • Raise the camera to eye level; a laptop on a stack of books is fine.
  • Wipe the lens. Fingerprints give that soft, hazy glow.
  • Plug external webcams straight into the computer, not through an unpowered hub.

Still not working? Describe it

An AI assistant suggests likely causes and fixes, cheapest first. It sees only what you type. Answers can be wrong; check your device maker’s support pages before opening anything up.

Questions

How do I test my webcam online?

Press “Start webcam test” and allow camera access. The live preview appears within a second or two, and the panel shows the resolution and frame rate your camera is actually delivering, not just what the box says.

Why does it say 640×480 when my camera is 1080p?

Browsers often start cameras at a low default. Choose 1080p or 4K from the resolution buttons to ask for more. If the reading stays low, the camera may be on a slow USB hub or port, or another app has already claimed it at a lower resolution.

My camera is detected but the picture is black.

Check for a physical privacy shutter or a keyboard camera-kill key (many laptops have one on F8 or F10). On Windows, look at Settings → Privacy → Camera. If another program such as Teams or OBS is using the camera, close it.

Is the video recorded or uploaded?

No. The stream goes straight from the camera to the video element on this page. Snapshots are drawn on your screen and only saved if you click download; nothing is sent to DeviceCheck Pro.

Why is my picture mirrored?

Previews are usually mirrored because that feels natural, like a mirror. The people on your call normally see the unmirrored image, so text behind you reads correctly for them. Use the mirror toggle to see both.

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