What QR Codes Are Used For
QR codes are two-dimensional barcodes that smartphones can scan to instantly open a URL, display text, initiate a phone call, or trigger other actions. They bridge the physical and digital worlds. Businesses use them on printed menus, product packaging, business cards, posters, receipts, event tickets, and in-store displays. QR codes are also used in contactless payments, app download campaigns, email marketing, and logistics tracking. Any situation where you want to give someone quick digital access from a physical item is a QR code use case.
Choosing the Right QR Code Size
The size at which you download a QR code should match its intended use. For digital display on a screen or website, 256 pixels is usually sufficient. For print materials, download at 512 or 1024 pixels to ensure the code remains sharp when scaled up. The minimum physical print size for a scannable QR code is generally 2.5 centimetres by 2.5 centimetres. Larger print sizes need higher resolution source images. Always test your QR code by scanning it before going to print.
How QR Codes Are Generated
This generator creates QR codes entirely in your browser using the open-source qrcode JavaScript library. No data is sent to any server. The QR code is rendered as a canvas element and then exported as a PNG image file. The content you encode — whether a URL, phone number, or plain text — is embedded directly into the QR code's dot pattern. Longer content creates more complex patterns with more modules, which slightly reduces scan speed and robustness at small sizes.
QR Code Best Practices
Always test your QR code on multiple devices before deploying it in a campaign. Ensure there is adequate white space around the code — at least 4 modules of clear border area around all edges. Avoid placing QR codes in locations with poor lighting, glare, or curved surfaces where scanning is difficult. Add a short call to action near the code telling people what to expect when they scan it. QR codes linking to URLs should use HTTPS to avoid security warnings on mobile browsers.