6 min read
2026-03-11
A QR code (Quick Response) is a two-dimensional barcode that stores information as a black-and-white matrix. It was invented in 1994 by Denso Wave for the automotive industry and is now used everywhere.
Links — website addresses, social media profiles
Text — any text up to ~4,000 characters
Contact — vCard with name, phone number, and email
Email — a pre-composed email with subject and body
WiFi — credentials for automatic network connection
Geolocation — map coordinates
Phone — a number for quick calling
Decide what the code should do: open a website, display text, or something else.
Choose the color, size, and error correction level:
| Level | Recovery | Use Case |
|---|---|---|
| L (7%) | Low | Clean surfaces |
| M (15%) | Medium | Standard use |
| Q (25%) | High | Industrial |
| H (30%) | Maximum | With a logo |
Save as SVG (for print) or PNG (for screens).
Test before publishing — scan the code with multiple smartphones
Size matters — minimum 2×2 cm for reliable scanning
Contrast — dark code on a light background, not the other way around
Add a CTA — label it "Scan me" near the code
Create your QR code in the QR Code Generator.
See also: Barcode Generator, Base64 Encoder