QR codes are everywhere now, but plenty of people still aren't sure how to scan one, or why scanning sometimes fails. The good news is that nearly every modern phone scans codes with no extra app at all. Here's exactly how, on every kind of device, plus quick fixes when it doesn't work.
Scanning on an iPhone
On any reasonably recent iPhone, just open the Camera app and point it at the code. A notification banner appears at the top of the screen; tap it to open the link. There's no separate scanner app needed, and it works the same whether the code is on paper or a screen.
Scanning on Android
Most modern Android phones scan directly from the camera app too. Open the camera, aim at the code, and tap the link that appears. Some phones include a dedicated scan mode or a shortcut in the quick settings, and Google Lens can scan codes on any Android device.
Older Phones Without Built-In Scanning
If your camera doesn't detect codes, a free QR scanner app from your app store adds the feature. Open the app, point it at the code, and it handles the rest. This is the simplest fix for phones a few years old that lack native scanning.
Why a Scan Sometimes Fails
Most failures come from poor lighting, a blurry or distant code, glare on a screen, or a code printed too small with no quiet margin. Move closer, steady the phone, reduce glare, and make sure the whole code is in frame. Well-made codes designed with a proper margin, like those from a QR generator, scan far more reliably.
FAQ
Common questions are answered in the FAQ section below.