28th October 2019

stackoverflow
13

How much data can be stored on a QR code?

A 101x101 QR code, with high level error correction, can hold 3248 bits, or 406 bytes. Probably not enough for any meaningful SVG/XML data. A 177x177 grid, depending on desired level of error correction, can store between 1273 and 2953 bytes. Maybe enough to store something small.

Also to know is, how big does a QR code need to be on a business card?

The common size of a business card is approximately 9 × 5 cm (3.5 × 2 in). Being said that, the QR code's size should not be below 1 x 1 cm (0.4 x 0.4 in). Having a QR code printed in a smaller size might not be able to be decoded by a QR code reader.

Do QR codes work in white?

No, QR codes can be composed of many different colors. But it must have enough contrast with the background to be scanned (that's why black and white QR Code are the most efficient). . As long as there is contrast in the colors it will work.

How do you read a QR code?

First, you need a QR-code app and a smartphone or tablet equipped with a camera. iOS users should check out RedLaser. Android fans can try either RedLaser or QR Droid, and BlackBerry users will like QR Code Scanner Pro. All of these apps are free to download, and each one should handle any standard QR code just fine.
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