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A QR Code counts nothing by itself. Here is how to measure visits with UTM parameters, your own redirect and Google Analytics, without a subscription.

Quishing, fake stickers over payment codes, fraudulent charges: how QR Code scams work and what to do to avoid them.

How to use QR Codes on booths, badges, banners and event check-in, with attention to the congested-network problem.

Which QR Code type to use on a business card, the minimum print size, and why a full vCard is usually the worst choice.

How to build a digital menu that works: where to host it, how to print the code, the mistakes that make customers give up, and when to keep paper menus.

Why part of a QR Code can be covered, the real size limit for a logo, and how to test before printing.

A practical diagnosis for QR Codes that will not scan: contrast, size, margin, logo, surface, lighting and content errors.

The 10-to-1 rule, a size table by scanning distance, minimum resolution and the precautions for each printed material.

The origin of the QR Code in 1994 at a Toyota subsidiary, the decision not to charge royalties, and how a pandemic turned it into what it is today.

The real technical difference between static and dynamic QR Codes, what monthly subscriptions actually sell, and how to get the same result without paying.

What each part of a QR Code means, how the information is stored, how error correction works and why some codes are denser than others.

A complete guide to creating a free QR Code: choosing the right type, customising, PNG versus SVG, sizing for print and testing.