A QR code that looks good on screen can fail after print if the file, size, material, or production process is wrong. Print quality is one of the most important QR success factors.
Print quality improves when the QR code is treated like a production asset, not an afterthought. Give the designer or printer the intended physical size, likely viewing distance, and preferred output format early. That context affects whether a vector file, larger quiet zone, or alternative placement is needed.
If the QR code will appear on textured stock, metallic packaging, curved labels, or outdoor signage, ask for a proof and test that exact material before approving the run.