For QR codes or barcodes that customers will scan themselves to access online support, coupons or other information about products, Avery 1 and ½-inch labels may be more appropriate.

These barcode systems use long-range infrared or laser-based readers to scan the sticker as the vehicle approaches and verify it against a resident database.

Now that fewer people smoke, we call them “barcode lines” because they resemble the vertical lines of a barcode sticker. No matter what you call them, ...

If a label has lots of barcodes and QR codes, like the below Amazon label, it's possible that some of those were never used at all. UPS, said Ruffin, ...

Con artists can, and do apparently, slap a sticker of their own barcode on top of a legitimate QR code, so you want to look for odd stickers or other signs of tampering.

New Gift Card Scam Uses Barcode Stickers to Steal Your Cash. Scammers cover up real gift card barcodes with custom codes, allowing them to quietly load your cash onto their cards at checkout.

One example of a community that uses this system is the Moors in Miami, where every resident has to put a barcode sticker on their car so the gate can scan it and let them in automatically.