A QR code can use one of four error correction levels. Higher error correction forces denser codes, but allows scanning in more situations. A trade-off!
Many restaurants have their menu just being a qr code nowadays. It became usual during covid, but manu stull keep it on the tables. The other day I was told explicitly to use it since they didn’t have a physical version.
They’re still used for instant login on multiplatform services like Steam or Discord. A device that’s not logged in will show a QR code next to the login prompt, and scanning it with a logged in device will show a prompt to allow the other device to log in to your account without needing to enter a username or password.
Other than that, I only see them at restaurants to open their menus in a web browser.
Can’t remember the last time I scanned a qr code, are they used in some businesses or something?
Many restaurants have their menu just being a qr code nowadays. It became usual during covid, but manu stull keep it on the tables. The other day I was told explicitly to use it since they didn’t have a physical version.
They’re still used for instant login on multiplatform services like Steam or Discord. A device that’s not logged in will show a QR code next to the login prompt, and scanning it with a logged in device will show a prompt to allow the other device to log in to your account without needing to enter a username or password.
Other than that, I only see them at restaurants to open their menus in a web browser.
They’re pretty useful for sharing wifi logins in person for smartphones, for example.