vCard QR code: data in the code or a link in the code
A vCard QR code on a business card can carry the whole contact or a link to a page with the details. How much room each takes on the card, what to enter and when the link stops working.
QR Codes
Everything about QR codes - creation, customization, business applications.
QR code with logo: how big the logo can be and what not to cover
A QR code with a logo works thanks to error correction, but its "30%" counts codewords, not area. How much logo our code survived, what not to cover and how to check it before printing.
Google review link: how to get it and make a QR code
Google gives you the Google review link and a ready QR code in your Business Profile. Where to click, how large to print the code and what Google's policies forbid when you ask customers for a review.
Minimum QR code size: why a code will not scan and how big it must be
Minimum QR code size depends on what the code contains, not on centimetres. Seven causes of a QR code not scanning in the order to check them, and a formula for the smallest print size for your content.
How to make a QR code: types of codes and what goes inside
How to make a QR code in a few minutes, which type to pick, what exactly is stored inside the code and when a static code is enough and when you need a code on a short link.