QR Code Reader: Scan from Image or Camera
Scan QR codes from image files or live camera — decode URL, text, WiFi, and contact QR codes.
Published:
Tags: QR code reader online, scan QR code image, decode QR code
QR Code Reader: Scan from Image or Camera Part of our complete guide to this topic — see the full series. QR codes appear everywhere — restaurant menus, product packages, event tickets, business cards. A browser-based QR reader handles all of them: upload an image or point a webcam, and the decoded content appears in seconds. --- What a QR Code Contains? QR (Quick Response) codes encode data as a 2D matrix of black and white squares. The ISO/IEC 18004:2015 standard and the ZXing library documentation define the encoding, error correction levels, and format information. What's inside depends on what the creator put there: | Payload type | Example | What you get | |---|---|---| | URL | | Clickable link | | Plain text | | Raw string | | WiFi | | Network + password | | vCard | | Contact…
Frequently Asked Questions
How do I read a QR code from an image?
Drop the image file onto a QR code reader or click to browse and select it. The tool draws the image to a Canvas element, passes it to the BarcodeDetector API (or ZXing decoder as fallback), and returns the decoded content — URL, text, WiFi details, or contact info.
How do I scan a QR code with my webcam?
Open the QR reader tool, click 'Use Camera', and grant browser camera permissions. The tool samples video frames from your webcam using the MediaDevices API and attempts to decode any QR code in the frame. Hold the code steady for reliable detection.
What information can a QR code store?
A QR code can store up to ~7,089 numeric characters or ~4,296 alphanumeric characters. Common payloads include URLs (most common), plain text, vCard contacts, WiFi network credentials (SSID + password + protocol), TOTP authenticator seeds, and geographic coordinates.
How do I decode a WiFi QR code?
Scan the QR code using the reader tool. WiFi QR codes use a standard format: WIFI:S:NetworkName;T:WPA;P:password;; — the tool parses this and displays the network name, security type, and password clearly. You can then enter these manually or let your phone auto-connect.
What is the maximum data in a QR code?
The QR code standard (ISO 18004) supports up to 7,089 numeric characters, 4,296 alphanumeric characters, or 2,953 bytes of binary data per code. Practical URLs fit well under 200 characters; long vCards or structured data may approach limits and require higher error-correction levels.
All articles · theproductguy.in