QR codes are one of the most deceptively simple technologies in common use. They look trivial — a square of black-and-white pixels — but getting them right in production involves a surprising number of decisions that affect user trust, campaign performance, and even policy compliance.
The Biggest Mistake: Blind Jumps to Unknown Pages
The most common QR implementation mistake is treating the code as a direct teleporter to a destination URL. When a user scans a QR code on a poster, packaging, or print advertisement, they have no idea where they're going. Unlike a hyperlink — which at minimum shows a URL on hover — a QR code gives no visual indication of its destination. This creates anxiety, especially for security-conscious users who are increasingly wary of phishing attempts.
The solution is a transparent redirect page. Instead of encoding the final destination URL directly in the QR code, encode a URL on your own domain that shows users a brief preview of where they're headed and asks for a deliberate tap to continue. This preview page serves multiple purposes: it builds trust, it dramatically reduces accidental navigation, it gives you analytics at the pre-click stage, and it provides a controlled environment where you can add relevant context or offers.
Static vs Dynamic QR Codes
Static QR codes encode the destination URL directly in the pixel pattern. Once printed, they can never be changed. If the landing page moves or the campaign changes, every printed code becomes invalid. For small personal projects or permanent reference materials this is fine, but for any marketing campaign or product packaging, static codes are a significant operational risk.
Dynamic QR codes use a short URL as the encoded destination. That short URL redirects to the actual final page, which you can change at any time from a dashboard. This means the printed code never needs to be updated even if the campaign destination changes. For anything with a meaningful print run, dynamic codes are strongly preferred.
Design and Error Correction
QR codes use Reed-Solomon error correction, which means a portion of the code can be obscured or damaged and the scanner can still recover the data. There are four error correction levels: L (7%), M (15%), Q (25%), and H (30%). Higher correction means more data redundancy, which makes the code slightly larger or denser but much more resilient.
For codes that will appear in physical environments — signage, product labels, billboards — use Q or H level error correction. Outdoor printing degrades, codes get scratched, and lighting conditions vary. The extra resilience is worth the slightly larger size. For digital-only use, L or M is usually sufficient.
When adding a logo to the centre of a QR code (a common branding practice), make sure the logo covers no more than 30% of the code area and that you've enabled H-level error correction. The logo effectively damages part of the code, and you're relying on error correction to compensate.
Testing Before Deployment
Always test QR codes with at least three different devices and apps before finalising them for production. Native camera apps, dedicated QR scanners, and third-party apps can behave differently, particularly with unusual characters in URLs. Test at multiple print sizes — a code that scans perfectly at 5 cm may fail at 2 cm due to print resolution limitations.
If the destination URL contains special characters (ampersands, equals signs, hash fragments), make sure they're properly URL-encoded before embedding them in the QR code. A single malformed character can break the destination link for every scanner that tries to read it.
QR Codes as a Trust Signal
Used transparently, QR codes can actually increase brand trust. When your redirect preview page clearly states the brand name, destination domain, and purpose of the scan before proceeding, users feel in control. That sense of control is one of the most valuable things you can give to a new visitor, and it sets a positive first impression before they've even reached your content.