QR Code Error Correction Levels: Types, Meaning, and Safe Defaults
QR code error correction explained: the error types it handles (scratches, smudges, logos), what each level (L/M/Q/H) means, and the safe default for most printed codes.
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How Big Should a QR Code Be? Print Size, Margins, and Resolution
Choose a QR code print size using scan distance and code density. Calculate PNG resolution, allow the right margin, and download an actual-size test sheet.
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What Is a QR Code? Definition, Anatomy, and Real Examples
QR code anatomy and definition: what a QR code is, what each labelled part does (finder, alignment, timing, quiet zone, data), and how to publish one that scans reliably.
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