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How to Read QR Codes from Images Using JavaScript?
2 months ago
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How to Read QR Codes from Images Using JavaScript?

QR codes are everywhere! They are used for websites, payments, menus, and much more. But how do you scan a QR code from an image on your computer or phone using JavaScript? Even if you're not a programmer, this guide will help you understand how it works in simple terms.

What is a QR Code Scanner?

A QR code scanner is a tool that reads QR codes and converts them into text, links, or other useful information. Many mobile phones have built-in QR scanners in their camera apps, but sometimes you need to scan a QR code from an image stored on your device. This is where a JavaScript QR code scanner can help.

How Does a QR Code Scanner Work in a Website?

  1. Upload an Image – The user selects a QR code image from their device.

  2. Read the Image – The JavaScript program analyzes the image to find the QR code.

  3. Decode the QR Code – The scanner extracts the information stored inside the QR code.

  4. Display the Result – The website shows the decoded text or link to the user.

Using JavaScript to Scan QR Codes

Developers use a tool called Dynamsoft Barcode Reader to make scanning possible in a web browser. It can scan QR codes from both live camera feeds and uploaded images.

Example of How It Works

  1. A button allows users to upload an image.

  2. A scanner reads the QR code from the uploaded image.

  3. The result is displayed on the screen.

How a QR Scanner is Coded

Although you don’t need to know how to code, here’s a simple explanation:

  • A library (Dynamsoft Barcode Reader) is loaded onto the web page.

  • A file input lets users select an image.

  • JavaScript reads the image and extracts the QR code.

  • The decoded information is shown as text or a link.

Features of a JavaScript QR Code Scanner

  • Scans from images: Upload an image to decode a QR code.

  • Scans from live video: Use your webcam to scan QR codes in real-time.

  • Works on mobile & desktop: No need to install an app, works directly in a browser.

  • Fast and accurate: Uses advanced algorithms to scan even blurry or distorted QR codes.

  • Reads multiple QR codes at once: Supports scanning multiple QR codes in a single image.

  • Handles incomplete or damaged QR codes: Uses smart algorithms to recover missing parts of QR codes.

  • Customizable for different needs: Developers can fine-tune scanning settings for specific use cases.

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