Question 1

What types of data can I encode in a QR code?

Accepted Answer

QR codes can encode URLs (most common), plain text, email addresses (mailto:), phone numbers (tel:), SMS messages (smsto:), Wi-Fi credentials (WIFI:S:NetworkName;T:WPA;P:password;;), vCard contact details, and geographic coordinates. Each type triggers a specific action when scanned on a smartphone.

Question 2

What is error correction level and which should I choose?

Accepted Answer

Error correction allows QR codes to be read even if partially damaged or obscured. There are four levels: L (7% data recovery), M (15%), Q (25%), and H (30%). Higher levels make QR codes denser and more resilient. For printed materials that may get scratched, use Q or H. For digital display, L or M is sufficient.

Question 3

Should I download my QR code as PNG or SVG?

Accepted Answer

Use SVG for print materials — it scales to any size without pixelation, which is important for business cards, posters, and packaging. Use PNG for digital use like websites, social media, and emails. For print, ensure the PNG resolution is at least 300 DPI (typically 1000×1000 pixels or larger).

Question 4

Can I use a colored QR code?

Accepted Answer

Yes, but with caution. The foreground (module) color must have sufficient contrast against the background for scanners to reliably read it. A contrast ratio of at least 4:1 is recommended. Avoid using similar colors for foreground and background, and test the QR code with multiple scanning apps before printing.

Question 5

Do QR codes expire?

Accepted Answer

Static QR codes — like those generated here — never expire. They encode data directly into the pattern, so they work as long as the destination (e.g., URL) remains active. Dynamic QR codes from third-party services may expire if you stop paying for the service. For permanence, use static QR codes with a URL you control.

QR Code Generator