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vCard 3.0 vs. MeCard in 2026: Which Format for Digital Business Cards?
vCard 3.0 carries photos and rich fields; MeCard stays small and scans fast. A 2026 field-by-field comparison for digital business card QR codes.
SVG vs. PNG QR Codes: Why Vector Wins for Print (and When PNG is Fine)
SVG QR codes scale to any size without blur; PNG is fine for web only. Learn DPI, CMYK, and a print-shop checklist before sending files to press.
The Quiet Zone Mystery: Why Your Custom QR Code Stops Scanning
The white margin around a QR code is not decoration — it is part of the spec. Learn the 4-module rule, common Canva mistakes, and exact pixel math.
Color Contrast for QR Codes: The 4:1 Rule and the Logo-Embedding 30% Rule
Why your branded QR fails to scan, the WCAG-adjacent 4:1 luminance ratio, and how much logo you can safely embed before error correction breaks down.