A logo can make a QR code stop scanning because it covers encoded modules, weakens the contrast between light and dark areas, or interferes with the patterns a scanner uses to find and decode the symbol. Error correction can recover some damage, but it does not make an overlay harmless. Reduce the logo, protect the code’s clear margin and corner markers, and test the finished code at its actual size.
What changes when you place a logo over a QR code?
A QR code stores data across most of its area. When a logo covers modules—the small light and dark squares that make up the symbol—the scanner receives incomplete information and has to reconstruct it. DENSO WAVE describes overlaid letters or pictures as a readability problem because they make the contrast between bright and dark areas less distinct. DENSO WAVE’s QR Code troubleshooting guidance also warns that distorted modules or too little surrounding margin can make a code difficult or impossible to read.
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The overlay can cause trouble in more than one way: it may hide encoded data, blur the boundary between light and dark modules, or cover features the scanner relies on to locate and interpret the code. A logo that looks small in a design preview can still obscure critical parts once the code is printed or displayed at a smaller size.
Why error correction may not save the code
QR codes include error correction, which can restore data when part of a code is dirty or damaged. It is a recovery mechanism, not permission to cover an arbitrary portion of the symbol. DENSO WAVE explains that an illustration or design over a code deforms it and invokes error correction; it also cautions that even a tiny missing or smeared part can make reading impossible or slow. Its FAQ recommends contacting DENSO WAVE about projects that arrange an illustration or design around a QR code.
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GS1 likewise treats a logo as damage because it blocks data, noting that a large logo or one that compromises locating features or error-correction modules can cause decoding to fail. A larger image area makes successful scanning less likely. GS1’s QR code guidance also stresses that the quiet zone—the clear margin around the code—matters, and that scanners used in consumer devices and retail supply chains may behave differently.
How large can a logo be in the middle of a QR code?
There is no universal safe logo size or overlay percentage established by these sources. The code’s design, output size, module size, contrast, and scanner all affect whether it remains readable, so a fixed percentage cannot guarantee a successful scan. A smaller logo reduces the amount of code it obscures, but it still needs to be tested in the final output.
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- Keep the logo away from the three large corner finder patterns used to locate the symbol.
- Do not cover the clear margin around the code.
- Keep the light and dark modules strongly differentiated; avoid colors or artwork that blur that distinction.
- Do not stretch, distort, or resize the finished image in a way that blurs its modules.
How to fix a QR code that stopped scanning
- Make the logo smaller and regenerate the code. Reducing the overlay is safer than trying to rescue a finished image that already hides too much information.
- Check the code’s margins and locating patterns. Leave the quiet zone clear and keep the logo off the large corner finder patterns.
- Improve the output. Restore strong light-dark contrast and avoid scaling that makes individual modules blurry. Where practical, use a larger code; DENSO WAVE says larger modules make a QR code more stable and easier for scanners to read. It recommends modules made of four or more dots for stable operation, but the effective size depends on the output and printer resolution. See DENSO WAVE’s module-size guidance.
- Test the final version at its intended size. Scan the actual printed item or screen display, not only a large design preview. Try the kinds of phones or scanning equipment your audience is likely to use; a successful scan on one phone does not establish that it will work reliably across devices.
Why can one device scan it while another cannot?
Scanning equipment differs, and a QR code that works on a consumer phone may still fail on equipment used in a retail or operational setting. GS1 notes this variation, which is why a single successful scan is not a reliable pass for every use. Test at the actual print or display size and across the types of devices expected to read the code.
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If you validate printed QR codes repeatedly as part of business operations, a QR-capable 2D scanner can help check the output under a consistent workflow. DENSO WAVE says its QK30 reads QR codes shown on LCD screens and printed on paper; using a scanner does not repair a code whose design obscures too much information. DENSO WAVE’s QK30 information describes the device’s supported media.
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- 【Ergonomic Design】 The curved handle is extended and thickened, tailor-made for North America customers. Specially designed smooth and flat trigger for better grip. 【Package Includes】Barcode Scanner x1, USB Cable x1, Dongle x1, User Manual x1
- 【Anti-Shock Silicone】 The orange anti-shock silicone protective cover can avoid scratches and friction while falling from the height of 6.56 feet. IP54 technology protects the wireless barcode scanner from dust.
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