How to Check Camera Quality on Your Phone

Last reviewed 2026-04-27. Open the camera test to verify your phone's camera in your browser - no app install required.

Test 1 - the camera opens at all

The first failure mode is "camera does not appear in the browser". Two common causes: the browser does not have camera permission (system-level - Settings > Privacy > Camera on iOS; site-level - the lock icon in the address bar), or another app is holding the camera (close any other app or browser tab using it). The test page surfaces both - it tells you which permission is missing rather than just failing silently.

Test 2 - resolution matches the spec

Phone camera specs are advertised in megapixels - 12 MP, 48 MP, 200 MP. A 12-megapixel sensor produces 4032x3024 photos; 48 MP gives 8000x6000 (or 4000x3000 in pixel-binning mode). The test surfaces the actual resolution the browser receives. If a 48 MP phone reports 4000x3000 in the browser, that is normal - browser-API access usually gets the binned-down photo, not the raw 48 MP. The full sensor only shows up in the native camera app's "high resolution" mode.

Test 3 - focus on text

Hold a piece of printed text (a book, a page of small print) at arm's length - about 30 cm. Tap to focus on the text. The text should be crisp and readable in the preview within 0.5 seconds of tapping. Slow focus or a soft preview after focusing both indicate either a defective autofocus motor or a smudged lens (next test).

Test 4 - bright and dim light

Take one photo outdoors or near a bright window. The result should be sharp, well-exposed, and free of visible noise. Take a second photo in a dim room (a corner away from windows, or evening light). The result should be darker but still recognisable, with some grain. If the bright photo has color shifts or the dim photo is mostly black with extreme grain, the sensor or the image-signal-processor pipeline has a problem.

Test 5 - check for lens issues

Point the camera at a plain white surface (a sheet of paper, a wall). Look at the preview at full screen. Visible specks on the image are usually dust on the lens cover - wipe with a microfiber cloth and re-test. Specks that move when you move the camera are on your viewing screen, not the lens. Specks that stay fixed regardless of camera movement are inside the camera module and are a warranty case.

For a complete pre-call routine see device test checklist for remote work, or run individual tests at the device test tools hub.