Rear Camera Test Online: Free Phone & Webcam Test
Click Start Rear Camera on this rear camera test to see its true Resolution and Frame Rate. Use the front camera test to check your hardware is actually working the way you expect, right from this page.
Want to know if the main lens on the back of your phone still works before a trip, a sale or a purchase? This rear camera test opens your phone camera in the browser with no download, shows a live preview, and reports the negotiated resolution, so you can judge sharpness, noise and lighting on the spot. It works on any smartphone and as a free camera test on a laptop too.
How to Test Your Camera Online, Step by Step
An online camera test needs nothing but a browser that can reach the camera. Most rear cameras pass in under a minute if you follow these steps in order. The start button may read "Start" or "Test my cam" depending on the tool, but the flow is the same, and everything you see updates in real time. Use the flash and torch test to check your hardware is actually working the way you expect, right from this page.
Grant Camera Access When the Permission Prompt Appears
Tap the start button and a permission prompt asks for camera access. Tap Allow. Browsers only hand the camera to pages served over https, so a plain HTTP page never shows a picture. If you tapped Block by mistake, fix it in site settings and reload the page.
Switch Camera to the Rear Facing Mode
Most phones open the front-facing lens first. Use the switch camera button or the device selector (some tools call it the camera-select control) to change the facing mode to "environment", which is the browser's name for the back of the phone. The rear lenses on a multi-camera phone may appear as separate entries.
Capture a Photo and Record a Short Clip
- Press Capture to grab a still photo and download it as a JPEG.
- Record video for ten seconds to check smoothness and focus while you move.
- Open fullscreen and zoom into the saved file to inspect fine detail.
What the Rear Camera Test Measures
The camera test reads what your camera hardware reports to the browser, not the figure on the box. That makes it a fair check of whether the image sensor and lens behave the way the advertised specs promise. Here is what a rear camera reading tells you. Use the test your phone's digital zoom to check your hardware is actually working the way you expect, right from this page.
Resolution, Megapixels and Aspect Ratio
The browser shows resolution as width x height in pixels. Two simple formulas turn it into the numbers you know:
$$\text{Megapixels} = \frac{\text{width} \times \text{height}}{1{,}000{,}000} \qquad \text{Aspect ratio} = \frac{\text{width}}{\text{height}}$$
Say the back lens on your phone negotiates 3264 x 2448. That is 3264 × 2448 = 7,990,272 pixels, or 7.99 megapixels, and \(3264 \div 2448 = 1.333\), a 4:3 aspect ratio. Common video modes to compare against: 1280 x 720 (720p, 0.92 MP), 1920 x 1080 (1080p, 2.07 MP) and 4K at 3840 x 2160 (8.29 MP).
Frame Rate and FPS in Changing Light
The frame rate readout shows how many frames per second reach the page. Your test reads 30 fps in daylight but drops to 15 fps in a dim room, because the sensor holds each exposure longer to gather light. A steady drop in bright light points to thermal throttling instead.
Focus, Autofocus and Sharpness
Hold printed text about 30 cm away and watch autofocus lock on. If focus hunts or the edges stay soft, check for a dirty lens or a smudged cover glass before you blame the hardware. Sharpness is easiest to judge on a captured still, not the moving preview.
Low Light, Flash and Image Quality
Turn off the room light to see low light image quality: grain, colour saturation, contrast and brightness all shift. Torch or flash control works only on some Android browsers, so a missing torch toggle is not a fault. Low light is where video quality falls apart first.
Checking a Used Phone's Rear Lens Before You Pay
I'm standing in a seller's kitchen with a used phone listed at $214, advertised with a 12 MP main camera. The question is simple: does the back camera really deliver that, or am I about to pay for a damaged module? The answer, after four minutes: it does, at 12.19 MP, but only once I picked the right lens.
I open this camera test in the phone's own browser, tap Allow, and switch to the back. The first reading is 1280 x 960, which works out to 1,228,800 pixels, or 1.23 MP. That clears the 720p check (0.92 MP) but sits nowhere near the listing's 12 MP, and for a moment it looks like a bad sensor.
The device selector shows two back-facing entries, so I try the second one before judging anything:
| Back-facing entry | Resolution | Megapixels | Frame rate |
|---|---|---|---|
| First entry (ultra-wide) | 1280 x 960 | 1.23 MP | 30 fps |
| Second entry (main lens) | 4032 x 3024 | 12.19 MP | 29 fps |
The second entry reads 4032 x 3024. I check it by hand: 4032 × 3024 = 12,192,768 pixels, and 4032 ÷ 3024 = 1.333, the 4:3 shape a phone's main still sensor uses. That matches the 12 MP spec, so the rear camera test confirms the main module is the original part.
Resolution isn't the whole story, so I capture a still of the seller's printed receipt, open it full size, and look at the corners. The text is crisp edge to edge, with no haze, which would point to a scratched cover glass.
The trap here is that a low first reading misleads. Browsers often open the ultra-wide first, and some cap the stream below the sensor's full size, so a phone with a 48 MP sensor can legitimately report less. Compare the reading to the same model's known output, never to the sticker alone. The number I'd watch is the gap between the two back entries: if every back-facing entry stayed near 1.23 MP, I would walk away or ask for at least $40 off for a camera repair.
Rear Lenses vs the Front Camera: Reading Your Phone Camera Results
On a phone, the front camera and the back lenses report different numbers, and a mobile browser shows fewer options than a laptop. Here is the same phone tested on both sides, compared with how a desktop webcam test behaves.
| Reading | Rear lens (this test) | Front lens (this test) | Laptop webcam |
|---|---|---|---|
| Resolution | 3264 x 2448 | 1440 x 1080 | Usually 720p or 1080p |
| Megapixels | 7.99 MP | 1.56 MP | 0.92-2.07 MP |
| Aspect ratio | 4:3 | 4:3 | 16:9 |
| Frame rate, bright / dim | 30 / 15 fps | 30 / 24 fps | Varies |
| Switch lenses | Yes | Yes | Not applicable |
The back lens delivers 5.14 times the pixels of the front one here, which is what you want for photos. For video calls on Android or iOS, the front side still matters more.
Why the Selfie Camera Reports a Lower Number
The selfie camera uses a smaller sensor and is tuned for a face at arm's length, so a lower reading after you switch is normal. Worry only when the rear lens reports less than the front one, which usually means the browser opened a secondary lens.
Live Preview Mirror vs the Saved Photo
Many tools mirror the front preview like a bathroom mirror, so text looks backwards. The back lens preview is rarely mirrored, so a sign or receipt in the saved rear photo reads the right way round, which makes that file the one to judge sharpness from. A flip toggle changes only the preview, and a rule-of-thirds grid simply helps you frame a subject, or yourself before a video call.
Troubleshooting a Mobile Camera That Shows No Signal
When a mobile camera shows no signal, the cause is almost always software. Work through these checks before you suspect a hardware failure, and remember that operating system privacy settings sit above any browser permissions on the device.
Camera Permission Blocked in iOS Safari or Android Chrome
In iOS Safari, open Settings, then Safari, then Camera, and set it to Ask or Allow. In Android Chrome, tap the lock icon, open Permissions and turn on the camera permission. In Firefox, use the camera icon beside the address bar. On a laptop, also check the operating system's own camera switch, and update outdated drivers or reseat a loose USB cable.
Another App Is Holding the Lens
A camera app, Zoom or a scanner running in the background can lock the lens. Close another app that uses the camera completely, not just to the home screen, then reload the page.
Blurry Feed or a Black Frame
A blurry or out-of-focus preview usually means a fingerprint on the glass. A solid black frame or black screen with no error points to a case or cover blocking the back lens, or a lens that failed to open.
Only One Lens Listed in the Camera Selector
Some device makers expose only one or two lenses to web pages, so the "cameras found" count can be lower than the lenses on the back. If the main lens still shows no picture, look for dust or scratches on the cover glass before you book a repair.
Privacy and Browser Support for This Camera Check
This camera check opens your camera only after you allow it, and the browser shows a camera indicator while it is on. Close the tab and the stream stops.
Runs Locally With Nothing Uploaded
The test runs locally: frames are processed client-side in your browser, and nothing is uploaded or stored on a server. Your privacy stays on your device.
Supported Browsers: Chrome, Safari, Firefox and Edge
- Chrome on Android, Windows, macOS and ChromeOS
- Safari on iPhone, iPad and Mac
- Firefox on Android and desktop
- Edge on Windows and Android
Frequently Asked Questions
- How do I test the rear camera on my phone?
- Open the test in your phone's browser, tap Start and allow camera access. Most phones open the front lens first, so tap Switch or pick a back-facing entry in the camera selector. The live preview, resolution and frame rate then come from the rear lens.
- Why does my rear camera show a lower resolution than the box says?
- The test reads the video stream the browser negotiated, not the still-photo sensor size. Browsers often cap the stream, and some open the ultra-wide lens first, so try every back-facing entry and compare the reading with the same phone model rather than the sticker.
- Why is only one camera listed?
- Some phones and browsers expose only one or two lenses to web pages. Close other camera apps, reload the page and check the cameras found count again. If the rear lens still never appears, the browser cannot open that facing mode.
- Can I use this to check a used phone before buying it?
- Yes. Confirm both lenses open, that the main back lens reaches its expected resolution, and capture a photo of printed text to look for haze from a scratched cover glass. Test in a dim corner too, since a weak lens shows grain and a low frame rate there first.
- Why does the frame rate drop in a dark room?
- The rear lens holds each exposure longer to gather light, so a drop from 30 fps to around 15 fps in dim light is normal. A low frame rate in bright light points to another app using the camera or the phone throttling.
- Does the rear camera test upload my photos or video?
- No. Everything runs locally in your browser. Snapshots stay on your device until you download them, and closing the tab stops the camera and clears the stream.
- Do I need to install an app?
- No. The test works in current versions of Chrome, Safari, Firefox and Edge on Android, iPhone and desktop over HTTPS. You only need to allow camera access when the browser asks.