What makes a QR code 'high quality'?

A high-quality QR code has good contrast (dark foreground on light background), adequate size, clear module edges, proper quiet zone (white border), and appropriate error correction level.

Why won't my QR code scan?

Common reasons include: low contrast colors, QR code too small, blurry image, missing quiet zone, or damaged/distorted modules. Our test identifies these issues specifically.

What is the minimum size for a scannable QR code?

For reliable scanning, QR codes should be at least 2×2 cm (about 0.8×0.8 inches) for handheld scanning. Larger viewing distances require proportionally larger codes.

Does the quiet zone really matter?

Yes! The quiet zone (white border) helps scanners identify where the QR code begins and ends. A minimum of 4 modules of white space on all sides is recommended.

Can I use colored QR codes?

Yes, but maintain high contrast. Dark colors on light backgrounds work best. Avoid light-on-light or dark-on-dark combinations. Our test checks contrast ratio.

How do I test if my QR code works?

Upload your QR code image to the Quality Test tool. It analyzes contrast, size, error correction level, data density, and quiet zone to give you a scan reliability score with specific improvement suggestions.

What makes a QR code hard to scan?

Common issues include low contrast between foreground and background, too much data crammed into a small size, insufficient quiet zone (white border), low error correction level when a logo is present, and printing on reflective surfaces.

QR Code Quality Test

QR Code Quality Test Tool

Test your QR code's scannability before printing or distributing. Our quality analyzer checks contrast, data density, error correction, quiet zone, and more to ensure your QR code scans reliably in real-world conditions.

What We Check

Contrast ratio -- WCAG-level contrast between modules and background
Data density -- Whether the QR code has too much data for its size
Error correction -- Whether the level is appropriate for the use case
Quiet zone -- Sufficient white border for reliable scanning
Device simulation -- Scan reliability across different phone cameras

Methodology

Our quality test follows the ISO/IEC 18004:2015 standard for QR code symbol quality assessment. Contrast is evaluated against WCAG 2.1 Level AA guidelines (minimum 4.5:1 ratio). Data density analysis considers the relationship between encoded data size, error correction level, and the QR version selected. Quiet zone validation checks for the standard 4-module border required by the specification. All analysis is performed locally in your browser — no images are uploaded to our servers.

Last updated: June 2026

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