QR Code & Barcode Blog

Guides, tutorials and comparisons on QR codes and barcodes

Guides

QR codes for print marketing: flyers, packaging, and menus

A QR code on a flyer or a package succeeds or fails at print time: placement, size, call to action, and the pre-print test that saves print runs.

September 24, 20264 min read

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Tutorials

Paste a list, get a ZIP of numbered PNGs: batch QR code generation for inventory labels, event badges, or product sheets — up to 100 per run.

September 23, 20264 min read

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Guides

What do the 13 digits of an EAN-13 mean? GS1 prefix, item reference, check digit formula — plus the manufacturing-country myth, debunked here.

September 23, 20264 min read

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Comparisons

EAN-13 for global retail, UPC-A for North America, Code 128 for internal logistics and SKUs: what each barcode encodes, and when to pick which.

September 23, 20264 min read

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Guides

Dark modules on a light background, strong contrast, no inversion: the rules for coloring a QR code — and the test to run before printing.

September 23, 20264 min read

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Guides

A QR code can stay readable with up to 30% of its surface damaged. Levels L, M, Q, H: what each one tolerates and when to raise correction.

September 23, 20264 min read

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Guides

A QR code is just a container: a tour of the payload formats — URL, tel:, mailto:, sms:, WIFI:, vCard — and what the phone does with each one.

September 23, 20264 min read

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Guides

Scan distance divided by 10, a 4-module quiet zone, strong contrast: the simple rules for sizing QR codes on business cards, flyers, and posters.

September 23, 20264 min read

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Tutorials

Putting a logo in a QR code works because of error correction — if you respect the size limit, the quiet zone, and level H. Here's the method.

September 23, 20264 min read

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