QR types & how-tos
vCard QR codes: put your contact details on a business card
A contact card that saves itself. The catch is that contact details are long, and long content makes a dense code.
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The QRify journal
How to make QR codes that actually scan.
Practical, tested guidance on QR codes — print size and resolution, the code types worth using, how the format actually works, and what to trust.
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Are QR code generators safe? What actually happens to your data
It depends on where the code is generated and whether it contains a redirect. A client-side generator builds the code in your browser and never sees your content. A server-side one receives whatever you type, and a tool producing dynamic codes routes every future scan through its servers, logging the scanner’s IP, location, device and time.
Read the guidePrint & scan quality
SVG vs PNG vs PDF: which QR export format to use, and when
Vector for print, raster for screens, and never JPEG. The reasoning takes two minutes and saves a reprint.
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§ 01By topic
Four things worth getting right.
Most QR failures trace back to one of these: a code printed too small, the wrong code type for the job, a misunderstanding of how the format works, or a tool you should not have trusted with the data.
Print & scan quality
Print & scan quality
SVG vs PNG vs PDF: which QR export format to use, and when
Vector for print, raster for screens, and never JPEG. The reasoning takes two minutes and saves a reprint.
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Print & scan quality
How to add a logo to a QR code without breaking the scan
A centre logo works because QR codes are redundant, not because they are magic. Here is how much redundancy you are spending.
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Print & scan quality
The minimum QR code size, and the scan-distance rule behind it
Most "it won’t scan" problems are a size problem. Two numbers and one table settle it.
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Print & scan quality
Print-ready QR codes: size, resolution, quiet zone, and export settings
A QR code that looks fine on screen can fail completely on paper. Almost everything that decides it is locked in before you hit print.
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QR types & how-tos
QR types & how-tos
vCard QR codes: put your contact details on a business card
A contact card that saves itself. The catch is that contact details are long, and long content makes a dense code.
Read
QR types & how-tos
How to make a Wi-Fi QR code (and what the string actually contains)
Guests stop asking for the password. Here is how the code works, how to make one, and the mistake that silently breaks it.
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How QR codes work
How QR codes work
QR code error correction levels (L, M, Q, H), explained
Higher is not better. Error correction is a budget, and spending it costs you module size.
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Privacy & safety
Privacy & safety
Are QR code generators safe? What actually happens to your data
Two different safety questions get confused constantly: whether the generator is safe, and whether the code is.
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Privacy & safety
Static vs dynamic QR codes: what each can and can’t do
One encodes your content. The other encodes a link to somebody else’s server. That single difference explains every other trade-off.
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