How to Scan QR Codes on Your Phone

QR codes or Quick Response codes are two-dimensional barcodes that were used initially by automakers in Japan. Workers used QR codes to track vehicles during the manufacturing process. Now QR codes are used in a variety of ways including sharing deals and website links, and for advertising. You've probably seen a QR code out in public even if you've never used one.

When you scan a QR code, it might open a link to a website or social media account, display a YouTube video, show a coupon, or contact details.

To scan a QR code, you need a smartphone with a camera and, in some cases, a mobile app. An iPhone running iOS 11 (or later) comes with a built-in QR reader in its camera, and some Android phones also have native functionality. Other smartphones may require that you download a mobile app; we recommend a few options below.

Advertising is probably the most common use of QR codes. Brands can add a QR code to a billboard or magazine, for example, that sends users to its website or a coupon or landing page. For the user, this takes away the hassle of typing in a long URL, or jotting it down on paper. The advertiser benefits from real-time results in which the user immediately visits their website rather than waiting until they get home, or worse, forgetting about it altogether.

Another use is through a virtual store, in which there's a large touch screen in a public place, such as a subway station or plaza. Shoppers can scan items with their smartphones and get the items delivered at a chosen time and location. Each piece has a unique QR code and works with a mobile app that stores payment and shipping information.

QR codes are often used to transfer cryptocurrency, including Bitcoin. Some cemeteries around the world have started adding QR codes to tombstones to make it easier for visitors to locate the gravesite.

Apple's iOS 11 offered many enhancements, including the addition of a QR reader into the smartphone's camera.

To scan a QR code with an iPhone camera:

Smartphones running iOS 10 or earlier can scan many types of QR codes using the Wallet app, which stores event tickets, boarding passes, coupons, and loyalty cards. The Wallet app can't read every QR code, though; only items it recognizes as passes, like the examples above. For a one-stop QR reader, you'll need a third-party app. 

The free Quick Scan – QR Code Reader is a full-featured app that can read QR codes out in the world and from images in your photo roll.

It can also add contacts to your address book, open links, and map locations, and add events to your calendar app. You can save codes for future reference, and the app has unlimited storage. All you have to do is open the app and point to the QR code you'd like to scan. If it leads to a URL, you'll get a notification that you can tap.

Android doesn't have a built-in QR code reader, so you'll need to download a third-party app and follow its instructions.

In general, the process is:

The QR Code Reader (free; by TWMobile) can scan QR codes, including Wi-Fi QR codes, which enable users to connect to a Wi-Fi hotspot without inputting a password.

When you want to scan a QR code, launch the app and point your smartphone at it; you'll then either see the code's information or get a prompt to open a URL.