QR code and barcode guides
Short, practical articles on print sizes, barcode types, check digits, safety and fixing codes that will not scan. Each one links to the tool that does the job.
QR code size guide: how big to print itMinimum and recommended print sizes for cards, posters, counters and banners, with a pre-print test.Static vs dynamic QR codes: what is the difference?How static and dynamic QR codes store data, what each can and cannot do, and which one fits your job.Which barcode type should you use?What Code 128, EAN-13, UPC-A, ISBN, Code 39, ITF-14 and QR hold, and how to pick one.How to get a barcode for your product in IndiaWhat GS1 India does, how GTINs work, and which barcodes you can make yourself without a licence.QR code safety checklistSpot fake QR stickers, preview links before opening them, pay by UPI carefully, and make codes people trust.QR code not scanning: ten causes and how to fix each oneA diagnostic order and a symptom-to-fix table for QR codes that phones refuse to read.Barcode check digit explained, with worked examplesHow the last digit of an EAN-13, UPC-A or ISBN is calculated, step by step, with checked examples.