Guest Clicks

QR Code Scan Size Calculator

QR Code Scan Size Calculator visual guide

A QR code that looks fine on screen can fail on a printed welcome sign when guests scan from several feet away. Size, contrast, and quiet zone matter more than decorative styling.

This calculator uses the standard scan-distance rule — one inch of QR width per ten inches of viewing distance — and adjusts for your sign format and print surface.

How It Works

  1. Set viewing distance: Choose how far guests will typically stand when scanning — welcome signs are farther than table cards.
  2. Pick sign size: Select your print format so the tool can check whether the sign can fit a scannable QR.
  3. Review print specs: Get recommended dimensions, quiet zone, DPI targets, and a scan reliability rating.

Why QR Size Affects Upload Rates

Undersized codes are the most common reason guests abandon a scan. Phone cameras need enough physical module size to lock focus quickly, especially in dim reception lighting.

Common Sizing Mistakes

  • Tiny QR codes on large entrance signs.
  • Low-contrast colors on textured paper.
  • Busy backgrounds with no solid white quiet zone.
  • Exporting at screen resolution instead of print DPI.

Frequently Asked Questions

What DPI should I use for a printed QR code?

150 DPI is the minimum for reliable scanning. Use 300 DPI for welcome signs and posters where print crispness matters.

Can I use colored QR codes on wedding signs?

Styled codes can work but scan less reliably than black on white. Test early and keep strong contrast on mission-critical signs.

Where do I get the actual QR code?

Create a Guest Clicks event to get the private upload page and QR code. You can then paste the upload link into the public sign tool to preview the final sign, or download the QR code from your event dashboard.

Create Your QR Code

Set up your event, download a scannable QR code, and connect it to the sign dimensions you calculated here.

Create Your QR Code

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