QR Code Guide: Generate, Scan and Avoid Pitfalls

Step 1: Generate a QR code

Open HeronTool's QR Code Generator:

  1. Enter a URL, text or any content;
  2. Adjust color, size and error-correction level (M is fine for daily use);
  3. Download a PNG and use it on posters, business cards or websites.

Need to share WiFi? Use the WiFi QR Generator: fill in the SSID and password, and guests scan to connect — no more spelling out passwords.

Step 2: Decode a QR code

Got a QR code of unknown origin? Upload the image to the QR Code Reader to decode the text or URL inside. Checking the content before opening it is a smart safety habit.

Tips for better scan success

  • Size and distance: keep the minimum side length above 2 cm; 3 cm+ is safer for printed posters;
  • Quiet zone: leave blank space at least 4 modules wide around the code;
  • Contrast: dark modules on a light background; avoid inverted or low-contrast colors;
  • Error-correction level: if you embed a logo, raise the level to H since the logo blocks data;
  • Flat, clean printing: wrinkled or glossy surfaces hurt recognition.

FAQ

Q: Do QR codes expire?
Static codes never expire by themselves; but if the payload is a link, a dead link means a dead code. Use dynamic codes (short-link redirects) when you may change the destination later.

Q: Are QR codes safe?
The code is just a carrier — the risk is in the content: scanning may open phishing links. Scan only codes from trusted sources, and preview content before visiting.

Q: Does the same content always produce the same code?
Yes. Identical content + same error-correction level + same version produce a deterministic pattern.

In summary

Generate, decode, avoid pitfalls — that's all it takes to use QR codes well. Tools like HeronTool's, which process locally with no ads, are convenient and safer too.