The QR code (Quick Response code) has become essential for quickly sharing information from a smartphone. Restaurant menus, business cards, advertising posters, e-commerce products or WiFi connections: a well-generated QR code improves user experience and facilitates access to information.

A QR code is a two-dimensional barcode capable of storing up to 4,296 alphanumeric characters or 7,089 digits. It consists of black and white square modules on a white background, and integrates error correction (levels L, M, Q, H) that allows the code to be read even if partially damaged. The QR code version (1 to 40) determines its capacity and size. For professional use, choosing correction level H (30%) ensures readability even if the QR code is printed on a damaged surface.

📊 Reference table

Content type Typical capacity Use case
URL Up to 4,000 chars Website, social media, product page
Free text Up to 4,296 chars Description, instructions
Email (mailto:) Address + subject Direct contact
Phone (tel:) International number Direct call
WiFi (WIFI:S:...) SSID + password + security Easy network connection
vCard Name, phone, email, address Digital business card

💡 Practical examples

Example 1: QR code for a restaurant menu Generate a QR code pointing to your online menu URL. Print at minimum 3×3 cm on a table card or window. Use correction level H for surfaces that may get stained.
Example 2: WiFi QR code for guest access Format: WIFI:S:NetworkName;T:WPA;P:Password;; — generate this QR code and display it at reception. Guests no longer need to type the password manually.
Example 3: QR code on business cards Encode your vCard (name, title, email, phone, website) in a QR code. Print it on the back of your business card. Minimum size: 2×2 cm for reliable scanning.