How Error Correction Makes Logos Possible
QR codes were designed to survive damage. The ISO/IEC 18004 standard includes four error correction levels, and your logo is basically controlled damage in the center of the code.
Level L recovers about 7% of data. Don't use this with logos. Level M recovers about 15%, enough for a tiny logo under 10% of code area. Level Q recovers about 25%, safe for logos at 15-20% of code area. Level H recovers about 30%, your best bet for larger logos at 20-25% of code area.
The single biggest mistake is cranking the logo up to 30% with error correction level M. The code looks great on screen. Then it fails on half the phones at the trade show.
Set error correction to Q or H when adding a logo. Period. EZQR does this automatically based on your logo's file size and dimensions, but if you're using another tool, you'll need to set it yourself.
Step-by-Step: Adding a Logo in EZQR
Prepare your logo file. PNG is the best format because it supports transparency and lossless quality. Minimum 500x500 pixels, square aspect ratio. Avoid gradients, thin lines, and fine text. They vanish at small print sizes.
Go to EZQR's generator and choose your code type. URL, vCard, WiFi, whatever you need. Enter your content and click "Add Logo." Upload your file. EZQR auto-resizes it to a safe percentage and sets error correction accordingly.
Adjust if needed. The slider lets you fine-tune size. Small (10-15%) is safest. Medium (15-20%) is the sweet spot for most brands. Large (20-25%) is maximum, only with H-level correction.
Check the scannability indicator. Green means you're good. Yellow means test carefully. Red means reduce your logo size. Download and test. Grab your PNG, SVG, or PDF file. Print a sample at actual size. Scan with iPhone, Android, and at least one third-party scanner like Google Lens.
What Makes a Good Logo for QR Codes
Not every logo works well inside a QR code. Simple icons, monochromatic marks, bold letterforms, and solid shapes work well. Think of a clean company initial or a bold icon. Logos with thin lines, detailed illustrations, color gradients, or small text work poorly. At 15mm inside a QR code, those details turn into an unreadable blob.
If your logo has fine details, create a simplified version specifically for QR codes. Many brands keep a "mark-only" version for exactly this purpose. And contrast matters. Your logo needs to be visually distinct from the QR modules around it. EZQR adds a white background behind logos automatically, but dark logos on dark QR codes still cause problems.
Common Logo QR Code Mistakes
Logo too big. Anything over 25% of the code area is risky regardless of error correction. EZQR prevents this, but other tools don't.
Wrong error correction level. Using L or M with a logo is asking for scanning failures. You need Q or H.
Not testing in real conditions. Your phone 3 inches from a monitor is not a real test. Print it. Scan it from the distance your customers will actually use. Test in the lighting conditions of your venue.
Companies print 50,000 business cards with an untested logo QR code and discover the problem too late. Don't be one of them. Sometimes no logo is better. A clean QR code with your brand name printed next to it scans faster and more reliably than any logo-embedded code ever will.
