QR Code Decoder

Decode QR codes from images.

Image

About QR Code Decoder

QR codes are two-dimensional barcodes that store text, URLs, contact information, WiFi credentials, and more. While most people scan QR codes with their phone camera, there are many situations where you have an image file instead — a screenshot, a downloaded graphic, or a photo saved on your computer. This decoder reads the image, locates the QR code pattern, and extracts the encoded payload. It supports standard QR code formats and works with JPEG, PNG, GIF, and WebP images. The decoding algorithm runs entirely in your browser using JavaScript, so your images stay private.

How to Use QR Code Decoder

  1. Click Choose image and select a file containing a QR code (JPEG, PNG, GIF, or WebP).
  2. The tool automatically scans the image for QR code patterns.
  3. The decoded content — text, URL, or other data — appears in the output area.
  4. Copy the decoded content to use it as needed (visit a URL, save contact info, etc.).

Key Features

  • Decodes QR codes from uploaded images — no phone camera required
  • Supports JPEG, PNG, GIF, and WebP image formats
  • Extracts URLs, plain text, vCards, WiFi credentials, and other QR payloads
  • Fast, client-side processing with no image uploaded to any server
  • Useful for verifying QR code content before following unknown links

When to Use This Tool

  • You have a screenshot or saved image of a QR code and need to read its content
  • Verifying the URL encoded in a QR code before visiting it (security check)
  • Extracting text or data from a QR code in a document or presentation
  • Decoding QR codes on a desktop computer without a phone camera
  • Testing QR codes you generated to confirm they encode the correct data

Technical Details

The decoder draws the uploaded image onto an HTML5 Canvas element and reads the pixel data. A QR code detection algorithm identifies the finder patterns (the three squares in the corners) and extracts the data matrix. The binary data is then decoded according to the QR code specification (ISO/IEC 18004). The entire process runs in JavaScript within your browser — no server calls are made. For generating QR codes, use the companion QR Code Generator. For decoding barcodes, check the Barcode Generator.

Conclusion

This free, browser-based QR Code Decoder lets you extract the content of any QR code from an image file — quickly, accurately, and privately. No phone camera needed, no uploads, and no sign-up required.

Frequently Asked Questions

Is my image uploaded to a server?
No. The image is processed entirely in your browser using JavaScript and HTML Canvas. Nothing is sent to any server.
What image formats are supported?
Any format the browser can decode: JPEG, PNG, GIF, and WebP. The image is drawn to a canvas and scanned for QR code patterns.
No QR code found — why?
Ensure the image is clear, the QR code is not too small or blurry, and there is enough contrast between the dark modules and the background. Try cropping the image to just the QR code area.
Can I decode multiple QR codes from one image?
The tool is optimized to detect and decode the primary QR code in the image. If your image contains multiple QR codes, crop to each one individually for reliable results.