QR Code Size Guide: How Big Should Your QR Code Be to Scan Reliably

A QR code that scans instantly on a laptop screen can fail completely once it's shrunk down and printed on a flyer. The reason isn't the QR code's design — it's the relationship between its printed size and how far away someone will be standing when they try to scan it.

The 10:1 rule of thumb

A commonly used starting point: the QR code's width should be at least 1/10th of the scanning distance. A code meant to be scanned from about 30cm away (a menu on a table) needs to be at least 3cm wide. One meant to be scanned from 3 metres away (a large poster or storefront window) needs to be at least 30cm wide.

Minimum sizes by use case

• Business cards — at least 2×2cm; anything smaller becomes hard for a phone camera to focus on
• Table tents / restaurant menus — at least 3×3cm, scanned from arm's length
• Posters / storefront windows — scale with distance using the 10:1 rule above
• Packaging — at least 2×2cm, and test on the actual packaging material, since glossy or curved surfaces add glare that a flat screen preview won't show

What actually breaks a scan (besides size)

• Low contrast — light grey on white looks stylish and fails to scan; stick to dark-on-light or light-on-dark with strong contrast
• Too much data packed in — a QR code encoding a long URL needs more modules (the small squares) than a short one, making it harder to scan small; shorten the URL first
• No quiet zone — the blank margin around the code needs to stay clear; text or graphics crowding right up to the edge can prevent scanners from locking onto it

Generate a QR code

Our QR Generator creates codes for links, WiFi, and more with a clean, high-contrast design built to scan reliably at typical print sizes — see it in action for a WiFi network, a restaurant menu, or a business card.