$\text{QR}$ codes are a vital link between physical media and digital destinations. However, errors in generation—especially aesthetic choices—can render the code completely unscannable, wasting print costs and losing potential customer engagement. Avoiding these mistakes is paramount.
Using brand colors that are too light for the code's foreground (the squares) or using a complex, dark background image. This reduces the luminance difference, confusing scanners.
Always maintain high contrast. Use dark colors (black or brand colors with deep saturation) for the foreground and pure white or a very light color for the background.
Using the lowest error correction level ($\text{L}$) for $\text{QR}$ codes deployed in public spaces (e.g., posters, billboards), where damage or dirt is common.
Use Medium ($\text{M}$) or High ($\text{H}$) error correction. While this slightly increases the code's complexity, it guarantees the code remains scannable even if $10%$-$30%$ of its surface is damaged or covered.
Embedding a very long, complex $\text{URL}$ directly into the code. This increases the complexity of the $\text{QR}$ pattern (more squares), reducing the code's tolerance for damage and making it harder to scan.
Use a URL shortener or a dynamic $\text{QR}$ $\text{Code}$ $\text{system}$ to keep the embedded data short. This simplifies the code pattern, improving scan speed and reliability.
Generating a code and immediately deploying it without testing the scan reliability on multiple devices ($\text{iPhone}$, $\text{Androids}$, $\text{older}$ $\text{phones}$). A code that scans on a new phone might fail on an old one.
Mandatory: Test the code on a diverse range of devices and in different lighting conditions (e.g., dim lighting, direct sunlight) before sending it to the printer.