Practical QR guides

The real-world reasons QR codes fail (contrast, quiet zone, blur, density, glossy print) and the quickest fixes that work on iPhone/Android.

Exact WIFI: payload format, what “Encryption” means, and how to avoid scan failures on iPhone/Android (special chars, hidden networks).

When SVG is mandatory (printing), when PNG is fine (screens), and how resizing affects scan reliability.

Why quiet zone is non-negotiable, how to choose colors that scan, and what backgrounds (patterns, gradients) break QR detection.

Best QR size for business cards: 20–25 mm (0.8–1.0"). Includes US/EU/JP card dimensions, quiet zone rule (4 modules), and a print checklist.

Which vCard fields actually get saved on iOS/Android, what to keep minimal, and how to avoid bloating the QR for better scans.

How to add UTM parameters to QR destinations, which UTM fields matter, and how to keep URLs short enough to avoid dense QRs.

How big should a QR be on posters and signs? Use a simple distance→size table, plus placement and glare tips for real-world scanning.

Pick the right error correction level for print/screens/logos. Learn the trade-off: higher correction = denser QR = needs larger print.

How to create a QR code for business card: vCard fields, size/dimensions, front-vs-back placement, label text, and scan fixes.

How to create a URL QR code, shorten long links, and keep scans reliable.

Clear differences, when static is enough, when dynamic matters (editable destination, tracking), and how it impacts scan reliability and print size.

How a redirect QR code works (dynamic/editable QR), how to create a QR code redirect to a website, how to update the destination later, and why you can’t edit a static QR image.

Step-by-step: create a business card QR code (vCard), pick the right fields, test-save to Contacts, and print at 20-25mm with a quiet zone so it scans fast.

If your business card QR code won't scan, fix the usual causes: size, quiet zone, blur, density, and contrast.

Create event QR codes that work for registrations, check-ins, and meeting links.

Where to place business QR codes and how to keep scans reliable.

Looking for the best free QR code generator online? Use this checklist: scan reliability, SVG/PNG downloads, local generation (privacy), static vs dynamic QR codes, and print sizing tips.

Step-by-step: scan QR codes on Android using the camera app or Google Lens. Includes scanning from a screenshot and quick fixes if it won’t scan.

How to create a Zoom meeting QR code (or webinar QR): which link to use, plus print tips for reliable scans.