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12 Reasons Why Your QR Code Doesn’t Work — and How to Fix It

QR codes may look simple and convenient, but even when using a high-quality generator, you might face issues with scanning. There are many possible reasons, and each is a sign that it’s time to revisit your approach to creating and placing your QR codes.

Below are the 12 most common reasons why QR codes don’t work, along with practical solutions — helping you improve the performance of your marketing campaign or digital business card.

1. Inverted Colors

One of the most common mistakes is using a dark background and a light QR pattern. QR scanners are designed to detect dark code patterns on light backgrounds. If the colors are inverted, scanning may fail.
Solution: Stick to the standard color scheme — a dark code on a light background. Avoid inversion.

2. Not Enough Contrast

Using colors that are too close in tone, such as pastels or light shades, makes the QR code hard to read. High contrast is essential for fast and accurate scanning.
Solution: Increase contrast. The best combination is a dark QR code on a white background.

3. Blurry Image

A blurry QR code is difficult or even impossible to scan. This usually happens when the image is downloaded in low quality or stretched from a smaller size.
Solution: Download your QR code in PNG or SVG format and ensure high resolution for print.

4. Pixelation

The more data you embed in a QR code, the denser the modules become. With static QR codes, this may result in pixelation and make scanning difficult.
Solution: Use dynamic QR codes if you need to store a lot of data. They contain a short redirect URL and stay visually clean and easy to scan.

5. Incorrect Size

QR code size depends on where it is placed. A business card needs a code around 2×2 cm, while a billboard may require a code at least 2 meters wide.
Solution: Adjust the size based on the expected scanning distance. When in doubt, go larger and test it.

6. Poor Placement

Even the best QR code won’t work if it goes unnoticed. Placing it below eye level, in a corner, or in a hard-to-reach area is a common mistake.
Solution: Position your QR code at eye level and in a visible location. Always include a clear call to action (e.g., “Scan to learn more”).

7. Data Errors

Sometimes a QR code points to a broken link or contains a typo in the URL. Even a small error can render the code useless.
Solution: Always double-check your data. Test the QR code on multiple devices and platforms before printing or publishing.

8. Expired Code

Some free QR code generators limit the number of scans or set an expiration date. This is especially true for dynamic QR codes.
Solution: Make sure your subscription is active if you’re using a paid platform. For permanent use, choose a static QR code with no expiration.

9. Inactive Link or Deleted Code

The QR code may have been manually deleted, or the destination page may no longer exist (e.g., a 404 error).
Solution: Regularly check and update the links your QR codes point to.

10. Over-customized Design

Too much customization can affect the readability of your QR code. Changing the module structure or adding excessive elements can break the code.
Solution: Don’t alter the structure. It’s fine to add a logo, change colors, or add a frame — but don’t go overboard. Functionality comes first.

11. Incorrect Scanning Distance

A QR code won’t scan properly if it’s too close or too far from the scanner. Small codes can’t be scanned from several meters away.
Solution: Ensure scanning distance is appropriate for the code size. The farther away the scanner, the larger the code should be.

12. Deactivated Campaign

Sometimes a QR code doesn't work simply because it was disabled by the owner — for example, after a campaign ended.
Solution: Make sure the QR code is active and not deactivated in your generator's dashboard.

Summary: Why Your QR Code Doesn’t Work

Most common reasons include:

  • Incorrect color usage

  • Low contrast

  • Poor image quality

  • Wrong size

  • Broken or misspelled URL

  • Expired code

  • Deleted or inactive destination

  • Excessive customization

  • Bad placement

  • Deactivated campaign

Tips for Creating and Using QR Codes

  • Test your QR code on multiple devices before publishing

  • Follow best practices: ensure contrast, correct size, and structure

  • Use reliable generators that allow editing and tracking

  • Customize carefully — don’t sacrifice functionality for design

  • Keep your links updated, especially with dynamic codes

  • Add a call to action to encourage users to scan

QR codes are a powerful tool — but only when used correctly. By following these simple rules, you can avoid common mistakes and ensure your code is effective, scannable, and valuable.