Prioritize contrast
Use a dark foreground and pale background. Avoid background textures and poor color contrast near the data and finder patterns.
Make small style changes
Rounded modules or dots work better when the code is large enough. Keep corner finders conventional and any logo small.
Select a file format
SVG is useful for scalable print layouts. A high-resolution PNG suits app and email workflows. PDF is convenient for printing the QR code as a page.