QRCODE-GEN

10 Common Mistakes and How to Fix Them When Using QR Code Menus in Cafés and Restaurants

QR Code menus, or digital menus accessed via QR codes, are quickly becoming the standard in Vietnam’s F&B industry. The reasons are clear: printing costs are significantly reduced, menu prices can be updated in seconds, and the contactless experience aligns with modern hygiene and convenience trends. However, many establishments still encounter recurring mistakes that frustrate guests, result in low scan rates, or even cause customers to give up entirely.

This article summarizes the 10 most common mistakes when implementing QR Code menus, their root causes, and practical solutions, along with best practices you can apply right away.


1. QR Code Cannot Be Scanned
 

This is the most frequent issue. By nature, a QR code is a geometric pattern that requires sufficient contrast and sharpness for cameras to recognize it.

Causes: When a scan fails, common reasons include:

  • QR code is too small for the scanning distance; image is blurry due to compression
  • Missing quiet zone (white border) around the code
  • Placed on reflective surfaces or behind glossy acrylic panels
  • QR code color is too light compared to the background

Solutions:

  • Print at an appropriate size for the context. On tables, at least 3–5 cm; on walls 1–2 meters from guests, 12–20 cm is recommended.
  • Export high-resolution PNG or SVG files, maintaining a quiet zone of at least 4–5 mm.
  • Choose matte-finish materials to reduce glare; use dark QR codes on light backgrounds. Before mass printing, test scans on both iPhone and Android devices under various lighting conditions.

2. Menu Link Won’t Open or Shows Access Error

If guests scan the code and see “page not found” or “access required,” the problem isn’t the QR code itself but the destination link.

Causes

  • Accidentally using a preview link instead of the public link
  • Google Docs/Sheets file is not set to public access
  • Renaming or moving files/folders invalidates old URLs; with dynamic QR codes, the destination URL may be changed incorrectly or the free plan has expired

Solutions

  • Standardize your link publishing process. Always enable “Anyone with the link – View.” Keep folder structures stable and avoid changing URLs.
  • For dynamic QR codes, enable confirmation before changing URLs, schedule regular link audits, and test on at least two browsers per operating system.

3. Slow Menu Loading Due to Large Images and Overly Long Layouts
 

Causes

  • Beautiful food photos are an asset, but if each image is 2–5 MB, guests using mobile data will face long loading times.
  • Additionally, menus that are too long or filled with effects and custom fonts can slow down the page.

Solutions

  • Optimize images to 150–300 KB each; use JPG or WebP for food photos that don’t require transparency.
  • Divide the menu into smaller sections such as Coffee, Tea, Pastries, so each part loads separately.
  • Minimize unnecessary effects and stick to one or two system fonts. If your hosting is slow, switch to a web-optimized platform with automatic compression enabled.

4. QR Code Fades or Smudges After a Short Time
 

Causes

  • F&B environments are exposed to steam, grease, and temperature changes; regular paper deteriorates quickly.
  • When codes fade or wrinkle, recognition algorithms may fail.

Solutions

  • Print on durable materials such as PVC, PET, or acrylic; use matte lamination to prevent scratches.
  • Use fade-resistant ink.
  • Avoid placing codes near heat sources or direct sunlight; clean gently with a damp cloth instead of harsh chemicals. For outdoor use, choose UV-resistant prints.

5. QR Code Blends into the Background or Is Obscured by Design Elements
 

Causes

  • Pastel color trends lead to low-contrast designs.
  • Oversized logos covering the data area can also cause errors.

Solutions

  • Use a flat, light background with a dark QR code; maintain a minimum contrast ratio of 4.5:1.
  • Limit logos to no more than 20% of the QR area and center them. Do not let frames or “Scan” text encroach on the quiet zone.
  • Always test scanning before finalizing your design.

6. Placement and Sizing Rules Based on Scanning Distance
 

Causes

Even a perfectly generated QR code can be hard to scan if placed incorrectly.

Solutions

  • On tables, a 15–30 degree tilt helps cameras focus faster.
  • At the cashier, eye level (110–140 cm) is ideal; 7–10 cm size is prominent enough.
  • On walls or standees 1–2 meters away, increase size to 12–20 cm and add a clear call to action.
  • Avoid placing near reflective light sources, glass doors, or areas with strong shadows.

7. Duplicate QR Codes Without Table or Area Differentiation
 

Causes

Using a single QR code for the entire venue is convenient at first but limits behavioral tracking. If you want to know which area gets the most scans, you won’t have the data.


Solutions

  • Create unique codes for each table or area, labeled with identifiers like B01, B02, etc.
  • If using dynamic QR codes, keep one printed code but assign different URL parameters for each table to enable tracking.
  • Maintain a central management sheet and assign appropriate access rights to staff.

8. Menu Items and Prices Not Updated Promptly

Few things disappoint guests more than seeing a price on the QR menu that differs from the bill, or finding out an item is sold out but still listed.


Solutions

  • Assign one person responsible for updates; set a fixed weekly schedule.
  • Use an easy-to-edit system like Google Sheets or a dedicated menu platform; log every change.
  • Update prices and items consistently across your fanpage, website, and in-store displays.

9. No Testing Before Mass Printing
 

  • Many owners send designs straight to print without real-world testing. Always scan test codes on multiple devices and under different lighting conditions.
  • Print a few samples, place them in their intended locations, and evaluate scanability, durability, and guest reactions.


10. No Instructions for Guests
 

  • A simple prompt like “Open your camera and scan the code to view the menu” can significantly increase scan rates, especially among older guests.

  • Use easy-to-read, high-contrast fonts; if your venue serves international guests, include an English version.

Key Notes When Using QR Code Menus
 

  • Use a light background and dark QR code; always include a clear quiet zone.
     
  • Choose durable, matte-finish materials; avoid direct sunlight and reflective surfaces.
  • Optimize images before uploading; group menu items, and limit visual effects.
  • Use dynamic QR codes for flexible editing or campaign tracking.
  • Place codes naturally along the guest journey, with a clear call to action.
  • Test across multiple devices and lighting environments before mass printing.
  • Schedule regular cleaning, inspections, and timely replacement of worn-out prints.


Conclusion
 

QR Code menus are a simple yet powerful tool when you master the basics. By addressing the ten common issues above, your venue will boost scan rates, reduce repetitive guest questions, and maintain a professional image. From design and printing to placement and content updates, treat your QR code as a vital service touchpoint that requires ongoing care. When done right, all the benefits of QR Code Menus—cost savings, speed, and measurable results—will be fully realized.