The gap between the thing you printed and the thing you built online is one square. Most businesses close it with a default black QR code pasted on top of a design it clashes with.
Volnyn's QR builder lets you set the colour, the size, the module shape and the eye style, so the code belongs to your design instead of fighting it.
Contrast is what makes a code scannable. If you pick something too pale it will look lovely and scan badly — go darker than feels right, and test it with an actual phone before you print a thousand of them.
