Webcam Test
Start a live preview to check that your camera works and see the resolution and frame rate it delivers.
Webcam Resolution Test
Find your webcam’s resolution: press Start, then Test resolutions, and the page asks the camera for six common sizes, from 320 × 240 up to 3840 × 2160, and shows the highest one it delivers. It works with webcams and phone cameras.
Everything runs in your browser. The camera picture is only shown on this page and is never recorded, stored or uploaded.
Camera names appear once you allow access.
Camera off
Current stream
- Camera
- —
- Resolution
- —
- Aspect ratio
- —
- Frame rate reported
- —
- Facing
- —
Test every size to get a result you can copy or share.
Runs entirely in your browser. Test results, audio and video never leave your device.
How to check your webcam resolution
- Press Start and allow camera access. If you have more than one camera, choose it from the Camera list.
- Read Current stream: the camera’s name, resolution, aspect ratio, reported frame rate and facing for the stream the browser opens by default.
- Press Test resolutions. The page asks for each size in turn, so the preview may blink, and the status shows Testing 1 of 6… as it goes.
- Read Requested sizes: each size is marked Supported or Not supported, with the size delivered or the reason it was refused. Highest delivered shows the largest size the camera sent.
- Press Stop to release the camera. Choosing another camera clears the results.
What resolution is my webcam?
A webcam’s resolution is the width and height, in pixels, of the video it sends, such as 1280 × 720 (720p) or 1920 × 1080 (1080p). In a browser, what counts is the largest size the camera delivers when asked for it exactly, which can be lower than the number on the box when that number describes still photos.
Which resolutions the test checks
The test asks for these six sizes in turn, each one exactly. Sizes outside the list, such as 1600 × 1200 or portrait sizes, are not tried, so a camera whose largest mode is not listed shows the largest listed size it accepts.
| Size | Name | Aspect ratio |
|---|---|---|
| 320 × 240 | QVGA | 4:3 |
| 640 × 480 | VGA | 4:3 |
| 1280 × 720 | HD (720p) | 16:9 |
| 1920 × 1080 | Full HD (1080p) | 16:9 |
| 2560 × 1440 | QHD (1440p) | 16:9 |
| 3840 × 2160 | 4K UHD (2160p) | 16:9 |
Why does my webcam show 640 × 480?
Current stream describes the video the browser opens by default, before and after a run, not the camera’s sensor. Browsers often default to 640 × 480, which reads as 4:3 even on a widescreen camera. The Webcam Test asks for 1920 × 1080 instead, so it shows a larger picture on cameras that can deliver one.
A delivered size is not proof of native capture either: the browser can crop or scale a larger picture down to the size requested, so the list shows what reaches the browser, not what the sensor captures.
What this test can detect
- Which of six common sizes, from 320 × 240 to 3840 × 2160, the camera delivers when asked for exactly that size.
- The largest of those sizes it delivers, shown as Highest delivered.
- Sizes the camera refuses or answers with a different size, each marked Not supported with the reason or the size it sent.
- The name, resolution, aspect ratio, reported frame rate and facing of the stream the browser opens by default.
How it works
After Start, the page shows the stream the browser opens by default. Test resolutions then requests each of the six sizes from the same camera with getUserMedia, using exact width and height constraints, so the browser cannot quietly substitute a nearby size. It waits 250 ms between requests so the camera can be released.
The size delivered is read from the video track’s settings. Aspect ratios are reduced from the pixel size and named when they match a common ratio such as 4:3 or 16:9. When the run ends, the default stream comes back. Nothing is recorded or uploaded.
Limitations
- Browsers and camera drivers can limit the sizes they offer, so a native app can sometimes use a size the browser cannot.
- Each request restarts the camera, so the preview and the camera light may blink during a run.
- The small preview only confirms the camera is on; judge picture quality in the Webcam Test.
- Camera names appear only after you allow access. If the camera does not start at all, see how to allow camera access.
Frequently asked questions
Why is 1080p or 4K marked Not supported?
Because the browser could not get that exact size from the camera. The reason appears under the size when the browser gives one, and if the camera answered with another size, that size is shown instead. Check the camera’s specifications for its video sizes rather than its photo resolution.
Can I see my webcam’s megapixels?
No. This test requests video sizes only. The still-photo megapixels often printed on the box are a separate figure; for comparison, a 1920 × 1080 video frame is about 2.1 megapixels and a 3840 × 2160 frame about 8.3.
Does a higher resolution mean a better picture?
Not by itself. Resolution is only the number of pixels; light, the sensor and the lens largely decide how clean and sharp the picture looks. Video call apps also often send a smaller picture than the camera delivers, to save bandwidth.
Can I test my webcam’s frame rate at each resolution?
No. Sizes are tested without a frame rate, and the rate under Current stream is what the browser reports for the default stream. The Webcam Test measures the frame rate it actually receives.