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QR Code Not Working? Here’s What You Need to Know

April 6, 2025
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QR codes have revolutionized how we access information, connect with brands, and make payments. However, it’s incredibly frustrating when a QR code is not working. Whether you’re at a restaurant trying to scan a menu or setting up a digital business card, scanning issues can derail your plans fast. In this guide, we’ll break down the most common reasons a QR code won’t scan, how to fix them, and what to do if your QR code is not working on Android or iPhone.

Why Is My QR Code Not Working?

There are several reasons why a QR code is not working. The most frequent causes include blurriness, color issues, sizing problems, placement mistakes, or even expired or broken links. But don’t worry—each issue can be easily resolved with the right strategy.

1. Poor Contrast With Background

The design might look sleek, but if your QR code blends in with its background, it becomes invisible to scanners.

✅ Pro Tip: Ensure at least 40% contrast between the background and foreground. High-contrast designs help scanners do their job.

Poor Contrast With Background

2. Overcrowding the QR Code

Trying to pack too much data into your QR code? That’s a common reason why a QR code won’t scan. The more content, the denser and harder the code is to read.

✅ Tip: Use dynamic QR codes instead of static ones. These allow you to host complex data externally and keep your QR simple.

Overcrowding the QR Code

3. QR Code Too Small or Too Large

A QR code that is either too small or too large won’t scan properly. If you place a tiny QR code on a business card or a huge one on a billboard, scanners might not pick it up.

✅ Rule of Thumb: Use the formula QR size = Distance / 10. The minimum size for a scannable QR code is 2x2 cm.

4. Blurry QR Code Images

One of the leading causes of a QR code not scanning is poor image quality. If you’ve resized your QR code image incorrectly or printed it in a low resolution, it may appear pixelated or blurry. This makes it hard for your phone’s camera to interpret.

✅ Solution: Always download and use high-resolution formats like PNG or SVG for your QR codes. Test print a sample before deploying.

Blurry QR Code Images

5. Inverted Colors

Inverting the standard black-on-white QR design can make the QR code not work. Scanners are designed to read dark patterns on light backgrounds. If you flip these colors, many apps won’t recognize the code.

✅ Fix: Stick to a light background with a dark foreground. Avoid making the foreground lighter than the background.

inverted Colors qr code

6. Wrong Placement

Yes, where you place your QR code matters. If it’s hidden behind glass, near a reflective surface, or placed too high/low, users may miss it entirely—or worse, can’t scan QR code due to lighting issues.

✅ Best Practice: Keep the QR code at eye level and away from shiny surfaces. Place it in an area with good lighting.

Phone Won’t Scan QR Code: Common Device Issues

Still stuck wondering, “Why won’t my phone scan a QR code?” It might not be the QR code—it could be your phone.

1. Camera Permissions or Settings

Sometimes your phone’s camera isn’t set up for scanning.

✅ iPhone: Go to Settings > Camera and enable “Scan QR Codes.”

✅ Android: Make sure you have the latest Android version and that Google Lens or camera scanning is enabled.

scan qr code with Iphone / Android

2. Lighting Conditions

Your camera can’t read what it can’t see. Poor lighting makes it difficult to scan.

✅ Quick Fix: Move to a brighter location or use your phone’s flashlight.

3. Dirty or Damaged Lens

This might sound basic, but a smudged lens can be the culprit when a QR code is not scanning.

✅ Solution: Clean your lens and try again.

Why QR Code Not Working on Android?

If your QR code is not working on Android, the issue might be app-specific or related to your Android version.

✅ Troubleshoot:

  • Try scanning with Google Lens.
  • Download a third-party QR scanning app.
  • Update your Android OS.

Still thinking “Why can’t I scan a QR code?” Try a different device or reprint the QR code.

Expired QR Code or Broken Link

A QR code not working might also stem from a broken or expired link.

✅ Fix:

  • Test your links before printing.
  • Use dynamic QR codes to update destinations even after printing.

Over-Customized QR Code

Too much design can hinder function. If your QR code is highly stylized with logos, images, or extreme patterns, it may no longer be readable.

✅ Best Practice: Keep it simple. A clean, scannable design with subtle branding works best.

Testing Your QR Code

Before you deploy or print your QR code, always test it using multiple devices and apps. What scans on your iPhone might not scan on an older Android. A few seconds of testing can save you a lot of trouble.

✅ Pro tip: Scan from different angles and distances. Also test under various lighting conditions.

Final Thoughts

A QR code not working can be frustrating, but it’s rarely unfixable. With a little attention to detail and pre-testing, you can avoid most issues. Whether it’s your phone won’t scan QR code or your QR code not scanning at an event, now you know how to troubleshoot quickly and effectively.

So the next time someone asks, “Why is my QR code not working?”—you’ll have the answers ready.

Need a better way to share your contact info? Try using a business card with QR code integration like KADO.

Frequently Asked Questions

If you are hesitating, do not worry - we are here to explain everything you might want to know. Let us help!

  • A digital business card is a modern, virtual way to share your contact details instantly using QR codes, NFC, or a simple link. Unlike traditional paper cards, a digital business card allows you to update your information in real-time, add interactive elements, and reduce environmental waste.

  • Your digital business card should contain your full name, job title, company, and essential contact details such as email and phone number. You can also add social media links, communication channels like WhatsApp or Calendly, custom buttons, and even video content. With KADO, you can fully customize your card’s design, including colors, company branding, and avatars, ensuring a professional and engaging digital presence.

  • Yes! KADO offers a free version that allows you to design your card from scratch, add links, and share it digitally with ease. The free plan includes essential features, while advanced customization options such as color themes and premium integrations are available in paid tiers. You may create your digital business card for free here..

  • Every KADO digital business card automatically includes a QR code that can be scanned for instant sharing. You can easily find your QR code in the app under the "Exchange" screen or access it through your web profile. If you want to learn more about creating a QR code business card, visit our website.

  • There are many options, but KADO stands out due to its unique features and enterprise capabilities:

    • It supports video, personalized buttons, and links—even in the free tier.
    • It integrates natively with HubSpot, Salesforce, and Microsoft Dynamics for seamless contact management.
    • It offers full design customization, including colors, logos, and company branding.
    • It is built for enterprises, offering advanced security, role-based access control, and an admin dashboard for managing team-wide digital business cards.

  • Absolutely. KADO takes security seriously by using encrypted cloud storage, restricting access through role-based permissions, and ensuring there are no public IPs that expose your data. Additionally, KADO complies with industry-leading security standards, including SOC 2 and GDPR, to protect your business and personal information at all times.

  • Yes! KADO is built with enterprises in mind, offering solutions tailored to businesses of all sizes. It provides centralized contact management, team-wide card distribution, and role-based permissions to ensure that sensitive company data remains protected. Administrators can also use a user-friendly dashboard to manage employees’ digital business cards efficiently.

  • KADO offers NFC-enabled digital business cards that allow you to share your contact details instantly by tapping your card on any NFC-compatible smartphone. Unlike traditional business cards, these NFC cards eliminate the need for scanning QR codes or manually entering contact details. You can request your NFC Business Card directly through our website.

  • No, KADO works seamlessly on both mobile and desktop browsers, allowing you to share your contact details without requiring an app. However, for enhanced functionality, KADO also offers a mobile app where you can store your card in an in-app wallet, quickly access your QR code, and share your card even without an internet connection.

  • You can share your KADO digital business card in multiple ways, making it easier to connect with others. The most common methods include displaying your QR code for scanning, sharing your unique link via email or text, or using an NFC-enabled card. The best part is that your recipient does not need an app to receive or save your contact details.

  • Yes, KADO offers seamless CRM integrations to enhance your workflow. KADO CRM integrations include HubSpot, Salesforce, and Microsoft Dynamics, allowing you to sync contacts and track interactions automatically. Additionally, KADO supports Zapier, enabling integration with over 100 other tools, making it an excellent fit for businesses that rely on automation.

  • Yes! If you have saved your digital business cards in your mobile wallet or as widgets on your device, you can still share your contact details even without an internet connection. This ensures that you are always ready to network, whether you are at an event, on a plane, or in an area with poor connectivity.

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