Webcam Test: Check the Live Camera Picture

What this webcam test checks

A webcam test on this page answers one question: can this browser open the camera and keep a moving picture on screen? The readings underneath the preview describe that picture. They are not a grade for the camera’s advertised specification.

• Live picture: whether the selected camera sends video into this tab after you allow access.
• Presented resolution: the width and height actually drawn, such as 640×480, 1280×720, or 1920×1080.
• Frame rate: the rate reported by the camera track, plus a separate count of frames this page presents.
• Local snapshot: a PNG saved on your device when you ask for one. The file is not uploaded.

The same test does not turn on the microphone, does not measure lens sharpness, and does not prove that a meeting app is using this camera. Use the Microphone Test when the question is audio input rather than a picture.

How to run this webcam test

Select Start webcam test and allow camera access when the browser asks. The request is for video only, so this page does not turn the microphone on. A preview should appear in the dark stage. If more than one camera is available, choose it from the Camera menu and watch whether the picture and the name change together. Give the preview a second to settle before reading the numbers. A laptop lid camera, a USB camera, and a virtual camera can all appear after permission is granted, and browsers often hide the real device names until that permission exists.

Look at the picture before you look at the counters. Wave a hand, turn your head, and check whether motion is continuous or frozen. Then read the presented resolution, the frame rate reported by the track, and the count of frames this page is actually presenting. Save a local snapshot only when you want a still image for your own comparison. The file downloads to your device as a PNG. It is not sent to InputChecks.

What the webcam resolution and frame rate mean

Presented resolution is the width and height of the video frame the browser is drawing, such as 640×480, 1280×720, or 1920×1080. Those sizes are the common names VGA, 720p, and 1080p. A camera can be capable of a larger size while this page receives a smaller one. The browser, the operating system, the USB port, and another application that already has the camera open can all take part in that negotiation. Treat the number as a description of this session, then retry after closing the other camera app if the size looks unexpectedly small.

The reported frame rate comes from the settings the browser exposes for the active video track. A common negotiated rate is 30 frames per second. Some cameras expose 15, 24, or 60. The reported value can be missing even when the preview is moving, because not every browser fills that setting. Presented frames are counted separately in this tab, once per second, from the frames the page actually receives. A report of 30 fps with a presented count that keeps falling into the teens is a clue that frames are being dropped on the way to the screen. A steady count close to the reported rate means this tab is keeping up. Neither number is a laboratory measurement of the camera sensor.

Choose the camera you mean to test

After access is allowed, the menu lists the video inputs the browser can see. Names can be generic, such as “Camera 1”, until the browser decides to expose a label. If two entries look alike, unplug one USB camera and see which name disappears, or compare the list with the operating system’s camera settings. A docking station, a capture card, and a virtual camera from a meeting tool can sit beside the built-in camera. Select the device you care about, then confirm that the picture changes. Switching cameras stops the previous stream and asks for the new one.

A successful preview of the built-in camera does not prove that a USB camera works, and the reverse is also true. Match the device name with the application where you noticed the problem. Meeting software often keeps its own camera choice, which can remain pointed at a disconnected device after you have already proved that a different camera works here.

Camera permission and what stays on this device

The W3C Media Capture and Streams specification describes the permission prompt and media stream this test uses. The camera starts only after you select Start webcam test. Browsers generally require a secure page before they will show that prompt. The stream stays in this tab for the preview and, only if you ask for one, for a snapshot. This page does not request an audio track and does not upload video.

Stop camera ends the tracks. Hiding the tab also stops the camera, so a preview does not keep running in the background. The browser’s own camera indicator can remain if another site or application is still using a camera. That indicator is broader than this page. If you previously blocked the permission, change it in the browser’s site controls and start again. The control’s location depends on the browser.

When the preview is black, frozen, or soft

A black preview with a changing resolution can mean a privacy shutter is closed, a lens cover is down, or the wrong camera is selected. A frozen picture can mean another application holds the device, the USB connection stalled, or the browser stopped delivering frames. Compare the presented-frame count for several seconds. If it stays at zero while the preview looks still, stop the test, close other camera apps, and start once more. If the operating system itself cannot show a picture, the problem is outside this page.

Soft focus, a dark image, or odd color is a property of the picture you can see, not a number this page calculates. Wipe the lens, face a light source that is in front of you rather than behind you, and turn off a camera effect or virtual camera if the image looks filtered. A snapshot is useful here because it freezes one moment at the presented resolution. Compare two snapshots only when you have changed one thing, such as the selected camera or the room light. Do not chase a higher resolution reading by installing extra software based on a single attempt.

What this webcam test cannot prove

The test cannot measure optical sharpness in line pairs, low-light noise in a standard chart, autofocus speed, or the camera’s true maximum specification. It cannot see a camera that the browser is not allowed to open. A virtual camera can show a picture even when the physical camera it claims to represent is failing. Frame timing can also move around when the computer is busy, so a short dip in the presented-frame count is not a failed sensor.

Use the result as a same-browser check. Repeat it after one change, then try a second browser if the first result was surprising. For a call that still fails after this page shows a clear moving picture, inspect that app’s camera choice and its own preview. Other local checks on this site, including the Microphone Test, answer a different question about a different device. A camera that previews correctly says nothing about whether the microphone in the same headset is selected.