Why Won't My QR Code Scan? Troubleshooting QRTracker QR Codes

1. Check the Print Size and Resolution

Problem: QR codes that are too small or printed at low resolution won't scan reliably.

Solution:

• Minimum Size: 2cm × 2cm (0.8" × 0.8") for close-range scanning
• Recommended Size for Posters/Signage: 5cm × 5cm or larger
• Resolution: Export at 300 DPI minimum for print. Use SVG format for infinite scalability.
• Viewing Distance Rule: The farther away users are, the larger your code needs to be. For every meter (3.3 feet) of distance, add 1cm to the code size.

2. Check Color Contrast

Problem: Low contrast between foreground and background makes QR codes unreadable to cameras.

Solution:

• Contrast Ratio: Aim for 4.5:1 minimum (use an online contrast checker)
• Best Practice: Dark foreground on light background (black on white, navy on cream, etc.)
• Avoid: Light gray on white, yellow on white, dark blue on black
• Test: Convert your design to grayscale – if the code is hard to see, contrast is too low

Learn more about safe color combinations in our design customization guide.

3. Check for Blurry or Damaged Artwork

Problem: Blurry, pixelated, or physically damaged codes can't be decoded.

Solution:

• Use Vector Formats: Download SVG instead of PNG for print – vectors never pixelate
• Check Print Quality: If printed, ensure the printer is set to high quality (not draft mode)
• Avoid Over-Compression: Don't compress PNG files too aggressively – it creates artifacts
• Physical Damage: Scratches, tears, or fading can make codes unscannable. Reprint if necessary.
• Laminate or Protect: For outdoor use, laminate codes to prevent weather damage

4. Test the Link It Points To (No 404s / Bad Redirects)

Problem: The QR code scans, but the link is broken or leads to an error page.

Solution:

• Test the URL Manually: Copy and paste the destination link into a browser – does it work?
• Check for Typos: A single character error breaks the link
• Verify HTTPS: Some devices block non-secure (HTTP) links
• Check Redirects: If using a URL shortener or redirect, make sure it's still active
• Monitor Expiration: Some platforms expire links after a certain period

5. Try a Different Phone / Better Lighting

Problem: Environmental factors or device limitations prevent scanning.

Solution:

• Test on Multiple Devices: Try both iPhone and Android. Older or budget phones may struggle.
• Improve Lighting: Bright, even lighting works best. Avoid harsh shadows or direct glare.
• Adjust Angle: Hold the phone parallel to the QR code, not at a steep angle
• Distance: Start 15-20cm away and move closer if needed
• Clean Camera Lens: A dirty lens reduces focus and scan accuracy

6. Check Camera Permissions

Problem: The phone's camera doesn't have permission to scan QR codes.

Solution:

• iPhone: Go to Settings → Camera → enable "Scan QR Codes"
• Android: Open Camera app settings and enable QR code scanning
• Third-Party Apps: If using a scanner app, check app permissions in device settings
• Update Software: Make sure the phone OS is up to date – older versions may lack QR support

7. Your Code Might Be Over-Decorated

Problem: Excessive customization (large logo, gradients, patterns) interferes with scanning.

Solution:

• Logo Size: Keep logos under 30% of the code area
• Avoid Gradients: Solid colors scan better than gradients or patterns
• Don't Distort: Never stretch or warp a QR code – keep it perfectly square
• Simplify Frames: Complex frames can confuse scanners – stick to simple borders
• Test After Every Change: Scan the code every time you add a design element

Review our guide on safe design practices to balance aesthetics with functionality.