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Guide

How QR Codes Work and How to Generate Them

Understand what QR codes encode, how error correction lets them scan when damaged, and best practices for use.

Open the QR Code Generator

A QR code is a two-dimensional barcode that encodes text — usually a URL — as a pattern of squares. A QR code generator turns a link or string into a scannable, downloadable code.

What a QR code encodes

A QR code stores arbitrary text: a URL, contact details (vCard), Wi-Fi credentials, plain text, or even a short SMS. Phone cameras decode the pattern and act on the content — opening a link, joining a network, or adding a contact.

Error correction levels

QR codes use Reed-Solomon error correction so they still scan when partly damaged or obscured. There are four levels: L (7% recovery), M (15%), Q (25%), and H (30%). Higher correction means more redundancy and a larger code, but better resilience — useful for printed codes that may get scuffed.

How to generate a QR code

  1. Enter the URL or text to encode.
  2. Choose a size and, if supported, colours and error-correction level.
  3. Generate and download the image (PNG or SVG).
  4. Test it with a phone before printing in bulk.

Examples

A restaurant menu URL encoded as a QR code lets diners scan to view the menu on their phones. A vCard QR code on a business card adds the contact with one scan. A Wi-Fi QR code lets guests join the network without typing a password.

When a QR code generator is useful

  • Linking printed materials (posters, flyers, packaging) to a web page.
  • Sharing Wi-Fi access with guests.
  • Digital business cards and contact sharing.
  • Contactless menus, payments, or check-in.

Put it into practice

Use the QR Code Generator right now — free, in your browser, no sign-up required.

Try the QR Code Generator

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