You have a range of options to put some color into your QR Code designs. Let's quickly go through them.
Please keep in mind to always use colors with at least a moderate contrast to one another and to the background. If contrast is too low it may impede the scanning process.
Basis
Choose a base color to be applied to all QR Code elements.
Set a basic color of your choice for your QR Code. Eyes
Set colors for your QR Code's 'Eyes'. You can use separate colors for each of the three centers and borders.
Set colors even for the third eye. Gradient
Implement a gradient color change from top to bottom. If the 'Eyes' have previously been set, they will not be affected by the gradient. Display the colors radially by activating the option.
Use gradient colors to liven up your QR Code. Transparent
Use this option combined with Transparent Background (see below) if you want to use the medium you print the code on as the visible background, and want the Code to improve readability on any background, even one having the same color as the pixels.
Want to print a blue QR Code on blue background? Use this option. Multicolor
Give your QR Code the ultimate branding by implementing your CI colors even into the smallest dot. Set a foreground and up to three additional colors to bring more live to your QR Code.
Counting the background, you can use up to five colors in your QR Code! Background
For all the above settings, you can additionally set the intended background color for your design.
Remember: If the contrast is too low, the QR Code might not properly scan. You may activate the Transparent Background: Only the QR Code elements will be rendered but not the background color; this is of use if you want to show the medium the QR Code will be printed on as the visible background. The rules of contrast still apply!
If you want to print the Code on a medium with the same color as the code, also use the Transparent tab!