While resizing and editing QR codes in external editor tools is not an Alida-specific product feature, following best practices is important. Improper edits can make QR codes unscannable, preventing members from accessing surveys and disrupting engagement.
Resizing QR codes using a vector-based image editor
To resize a QR code without losing its scannability, you must use a vector-based image editor. When resizing a QR code please note the following:
- A vector-based image editor allows you to scale the QR code to any size while preserving its sharp, clean lines.
- Common vector file types include SVG, EPS, PDF, AI.
Avoid using bitmap or raster editors, as they can pixelate the image, making it unreadable by scanners.
- Since raster images are made of grid pixels; making the image larger often results in a blurry and blocky appearance which introduces inaccuracies that can distort the QR code's pattern, making it unscannable.
- Common raster file types include JPEG, PNG, GIF, BMP.
How to resize and edit your QR code
- Use a vector-based editor for scaling the image and using vector graphics.
- Do not crop or remove the white space borders of the QR codes, known as the "Quiet Zone." This area helps scanners differentiate the code from surrounding elements.
- The Quiet Zone is mandatory and should be at least 4 modules (small squares) wide on all sides.
- Lock or flatten the QR code layer in editable templates to discourage accidental edits.
- Set a minimum print size. Typically 1 x 1 inch (2.5 cm) at 300 DP (dots per inch) is a safe minimum for print. If the QR code is sized too small to print clearly at 300 DPI, it loses detail which causes print resolution issues.
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Save the resized/edited QR code in the appropriate format. For print, a PDF or EPS is often best. For web use, SVG is recommended since it's a scalable web-friendly format.