qrcodegenerator.in blog https://qrcodegenerator.in/blog/ What we learn making QR codes that scan, and keep scanning. en-in Sun, 01 Nov 2026 12:00:00 +0000 How big should a QR code be? The arithmetic, and the part nobody can give you https://qrcodegenerator.in/blog/qr-code-print-size-arithmetic/ https://qrcodegenerator.in/blog/qr-code-print-size-arithmetic/ Sun, 01 Nov 2026 12:00:00 +0000 Print Payload length sets the module count, the module count divides your print width, and the printer’s resolution decides whether a module prints cleanly. All three are arithmetic. The scan distance is the part that is not. What a UPI QR code contains, field by field — and the ones that break payments https://qrcodegenerator.in/blog/upi-qr-code-fields-explained/ https://qrcodegenerator.in/blog/upi-qr-code-fields-explained/ Sun, 01 Nov 2026 12:00:00 +0000 Payments A UPI QR code is a link that starts upi://pay, followed by a handful of fields. Most failed scans at a counter come from three of them being missing, malformed or wrongly encoded. What “expires” really means when a QR code stops working https://qrcodegenerator.in/blog/what-qr-code-expired-really-means/ https://qrcodegenerator.in/blog/what-qr-code-expired-really-means/ Sun, 01 Nov 2026 12:00:00 +0000 Dynamic QR The code never expires. The redirect behind it gets switched off. A plain-language account of how the category ended up here. Static or dynamic: a decision table, not a sales pitch https://qrcodegenerator.in/blog/static-or-dynamic-qr-code/ https://qrcodegenerator.in/blog/static-or-dynamic-qr-code/ Sun, 01 Nov 2026 12:00:00 +0000 Dynamic QR Six questions that settle it, including the two cases where a static code is genuinely the better engineering choice. How much of a QR code can a logo cover? https://qrcodegenerator.in/blog/qr-code-logo-size/ https://qrcodegenerator.in/blog/qr-code-logo-size/ Sun, 01 Nov 2026 12:00:00 +0000 Design Error correction gives you a damage budget. A logo spends it before the code is printed, and the budget is counted in codewords, not in area — which is why “up to 30%” is the wrong way to think about it. Dot styles, rounded eyes and the modules you are quietly shrinking https://qrcodegenerator.in/blog/qr-code-dot-styles-and-scanning/ https://qrcodegenerator.in/blog/qr-code-dot-styles-and-scanning/ Sun, 01 Nov 2026 12:00:00 +0000 Design A round dot inside a square module is 79% of the ink the square would have been. That is the first cost of a dot style, and it is arithmetic. The second is what styling does to the corner patterns a camera looks for first. Quishing: how QR phishing works and what actually stops it https://qrcodegenerator.in/blog/quishing-qr-code-phishing/ https://qrcodegenerator.in/blog/quishing-qr-code-phishing/ Sun, 01 Nov 2026 12:00:00 +0000 Security Sticker-over-sticker attacks, redirect chaining and homograph domains — plus why decoding before opening defeats all three. CMYK conversion is why your code failed at the printer https://qrcodegenerator.in/blog/cmyk-conversion-qr-code-contrast/ https://qrcodegenerator.in/blog/cmyk-conversion-qr-code-contrast/ Sun, 01 Nov 2026 12:00:00 +0000 Scanability A code designed on screen is in RGB; a press prints CMYK. The conversion moves colours — usually toward lower contrast — and a code that passed on screen can arrive under the line on paper. Why we never store a raw IP address https://qrcodegenerator.in/blog/why-we-never-store-a-raw-ip-address/ https://qrcodegenerator.in/blog/why-we-never-store-a-raw-ip-address/ Sun, 01 Nov 2026 12:00:00 +0000 Security Geo is derived at the edge and the address discarded before the event leaves the worker. What that costs us in analytics, and why it is worth it. UPI QR codes with a fixed amount: when to use one, and when it costs you payments https://qrcodegenerator.in/blog/upi-qr-code-with-fixed-amount/ https://qrcodegenerator.in/blog/upi-qr-code-with-fixed-amount/ Sun, 01 Nov 2026 12:00:00 +0000 Payments Putting the amount in the code saves the customer typing it and stops wrong amounts. It also means the code is wrong the day the price changes — and a payment code cannot be a dynamic redirect. Error correction levels L, M, Q and H: what each costs, and when to raise it https://qrcodegenerator.in/blog/qr-code-error-correction-levels/ https://qrcodegenerator.in/blog/qr-code-error-correction-levels/ Sun, 01 Nov 2026 12:00:00 +0000 Scanability A higher level lets a code survive more damage and makes it denser for the same data. Choosing it is a trade between those two, and the numbers for both are in the standard. Curved, glossy, outdoors: where printed QR codes meet the real world https://qrcodegenerator.in/blog/qr-codes-on-curved-glossy-outdoor-surfaces/ https://qrcodegenerator.in/blog/qr-codes-on-curved-glossy-outdoor-surfaces/ Sun, 01 Nov 2026 12:00:00 +0000 Print A bottle bends the code away from the camera, a laminate throws the light back at it, and a summer in a shop window takes the black out of it. Each has a cause you can reason about before printing. Why won’t my QR code scan? Five causes, and which of them we can measure https://qrcodegenerator.in/blog/why-wont-my-qr-code-scan/ https://qrcodegenerator.in/blog/why-wont-my-qr-code-scan/ Sat, 22 Aug 2026 12:00:00 +0000 Scanability Four of the five have an answer in the specification or in arithmetic you can repeat. The fifth is the one every tool gives you a number for, and it is the one nobody should.