Generally, the minimum print size is 2x2 cm (about 0.8 inches). If it's smaller, smartphone cameras may struggle to read it. For business cards, 1.5 cm is possible, but more data requires a larger size. We recommend at least 3x3 cm for safety.
Common reasons for unreadable QR codes include: ① Print size is too small. ② Poor color contrast (e.g., dark QR on a dark background). ③ Blurry or distorted image. ④ Too much data making the QR code overly complex. This tool uses error correction level 'M', meaning it can be recovered even if up to 15% is damaged.
Yes. However, the more data you include, the more complex the QR code becomes, which can lower the scanning success rate. Depending on the version, a QR code can hold up to ~4,296 alphanumeric characters. We recommend using short URLs whenever possible for the best scanning experience.