QR Code Size Guide: How Big Should Your QR Code Be?

The 10:1 Distance Rule

The simplest way to determine QR code size is the 10:1 rule: the QR code width should be at least 1/10th of the expected scanning distance.

• 30 cm (phone screen) → 3 cm minimum QR code
• 1 m (poster on a wall) → 10 cm minimum QR code
• 3 m (banner or trade-show sign) → 30 cm minimum QR code
• 10 m (billboard) → 1 m minimum QR code

Minimum Sizes by Use Case

Here are recommended minimum QR code sizes for common use cases:

Factors That Affect Scanability

Size isn't the only factor that determines whether a QR code scans reliably. Keep these in mind:

• Data density - More data means more modules (tiny squares), which means the code needs to be larger to remain scannable.
• Error correction level - Higher error correction adds redundancy but also increases the number of modules.
• Contrast - Low contrast between the QR code and background makes scanning harder regardless of size.
• Quiet zone - The white border around the QR code is essential for scanners to detect the code boundaries.
• Print resolution - Low-resolution printing can blur module edges, especially at smaller sizes.

Quiet Zone Requirements

Every QR code needs a minimum 4-module-wide quiet zone (white border) around all four sides. This blank space helps scanners distinguish the QR code from its surroundings.

Cropping or removing the white border is one of the most common reasons QR codes fail to scan. Always include the full quiet zone when placing a QR code in your design.

Best Format for Printing

For print materials, the file format matters:

• SVG (recommended) - Vector format that scales to any size without losing quality. Perfect for print.
• PNG at 300+ DPI- Use raster images only when vector isn't supported. Ensure at least 300 DPI at the intended print size.

Link2QR supports both SVG and PNG downloads so you always have the right format for your project.

Digital Display Sizes

When displaying QR codes on screens, size depends on the screen resolution and expected viewing distance:

• Web pages - Minimum 150 × 150 pixels for comfortable scanning from a phone.
• Email - Minimum 200 × 200 pixels to account for varying email client rendering.
• Presentations - At least 300 × 300 pixels on screen, or larger depending on room size and projector resolution.

Tips for Better Print Results

• High contrast - Black on white is the most reliable combination. Avoid light colors on light backgrounds.
• Matte finish - Matte paper is preferred over glossy to reduce glare that can interfere with scanning.
• Flat surfaces - Avoid placing QR codes on curved surfaces like bottles or cylinders where distortion can occur.
• Test before mass printing - Always scan your QR code from the expected distance before committing to a print run.

Learn more about ensuring your codes work reliably in our QR code reliability guide.

Related Resources

• QR Code Reliability Guide
• QR Codes for Business Cards
• Frequently Asked Questions
• QR Code Templates