QR Code from Image

QR code scanning from image files serves a different purpose than live camera scanning. When you receive a screenshot containing a QR code, have a saved QR code image on your computer, or need to batch-process multiple QR codes from files, camera scanning is impractical or impossible. This tool loads the image into a Canvas element and analyzes the pixel data to locate and decode QR code patterns. The detection algorithm identifies the three distinctive square finder patterns that mark QR code corners, calculates the code's orientation and scale, reads the encoded data modules, and applies error correction to recover from any damage or distortion. The tool supports all standard QR code data types: URLs, plain text, WiFi credentials, vCards, email addresses, phone numbers, SMS messages, and calendar events. Processing happens entirely in your browser — important for security-conscious users who want to verify what a QR code contains before scanning it with their phone. Malicious QR codes can redirect to phishing sites, and checking the decoded data first provides a safety layer.

QR codes can encode several standardized data types, each triggering specific actions when scanned. URL QR codes are the most common — they contain a web address that opens in the scanner's browser. Always verify URLs decoded from QR codes before visiting them, as malicious codes may point to phishing or malware sites. WiFi QR codes contain network credentials in the format WIFI:T:WPA;S:NetworkName;P:Password;; — scanning connects the device automatically. vCard QR codes store contact information (name, phone, email, address) in a standardized format that adds the contact directly to the phone's address book. SMS and email QR codes pre-fill messages to specific numbers or addresses. Calendar event QR codes add appointments directly to the scanner's calendar. Plain text QR codes simply display their content without triggering any action. This verification tool is particularly useful for security auditing — checking what data QR codes in your office, marketing materials, or received correspondence actually contain before trusting them with your device's scanner.