Home / Guides / QR code not scanning? A fast troubleshooting checklist ← All guides QR code not scanning? A fast troubleshooting checklist The real-world reasons QR codes fail (contrast, quiet zone, blur, density, glossy print) and the quickest fixes that work on iPhone/Android.
How we verify this guide
Before this page is included in the public guide directory, its examples are compared with the payload produced by the linked QRFlow generator and with the export and scan-readiness controls available in the current build. Camera, lighting, paper, print size, and destination apps can still change the result, so important print runs should always be tested on the final material and real devices.
If your QR code doesn’t scan, it’s usually not “the QR generator” — it’s print/contrast/size/density. Here’s the fastest way to fix it.
Step 1: Confirm the payload is valid # For URLs, open the destination directly first (no redirects that block mobile). For WiFi, verify SSID/password and encryption. See: WiFi format guide . For vCard, keep fields minimal. See: vCard fields guide . Step 2: Fix the “3 killers” # 1) Not enough quiet zone (margin) Keep a blank margin around the QR (at least 4 modules). Don’t crop it in Canva/Figma/Word.
2) Too small for the distance For business cards: 20–25mm. For posters/menus: go larger. See:
size guide .
3) Blur / low contrast / glossy reflections Dark on light, sharp edges, avoid glossy laminate reflections, avoid busy backgrounds.
Step 3: Reduce density (if needed) # Use a shorter URL (remove long tracking params if you can). For vCard, remove non-essential fields. Print larger if the payload must be long. Quick test routine # Test on iPhone camera + one Android camera. Test under indoor lighting (not only your desk lamp). Test from the real scan distance (30–50cm for cards; 1–2m for posters). If it still fails, regenerate with a larger size and download SVG (print sharp). See: SVG vs PNG guide .
Recommended templates URL QR Code
Convert a website link to a QR code instantly, then download a clean SVG or PNG.
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Business Card QR Code
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WiFi QR Code
Create the WiFi QR and a print-sized guest card or fold tent locally, then scan-test the physical result on iPhone and Android.
YouTube QR Code
Turn the right YouTube destination into a QR code, then check the scan flow before using it on posters, packaging, slides, or merch.
Instagram QR Code
Create an Instagram profile QR on desktop/web and download PNG or SVG for cards, packaging, posters, creator kits, or quick sharing.
Use cases & print ideas Matching pages that explain where this QR type works best before you open the generator.
Related guides Troubleshooting
Diagnose a business card QR code that won't scan: test the file, then fix size, quiet zone, contrast, glare, blur, vCard density, styling, or print damage.
Step-by-step: scan QR codes on Android using the camera app or Google Lens. Includes scanning from a screenshot and quick fixes if it won’t scan.
Scan QR codes on iPhone with Camera or Control Center, open a QR from a saved image, and fix codes that do not produce a link.
Scan a QR code on Windows or Mac from a camera, screenshot, image, or PDF. Includes a local browser reader that does not upload the file.
Scan a Discord login QR in the mobile app, scan server invite QRs with a camera, and recognize QR login scams before authorizing a session.
How to scan a QR code from an image, screenshot, or photo in your browser (privacy-friendly). Tips if decoding fails.
Quick answers Common questions What are the top scan killers? Missing quiet zone, low contrast, glossy print, and QR too small.
Should I change error correction? Increase size first; higher correction can make codes denser.
Try it now
Generate QR codes locally in your browser — no uploads.