BagCapturepermits to decode images of barcodes at your computer. Navigate to a WEB site, to a blog. Interested in knowing what this QR Code (or Data Matrix) hides underneath? Launch BarCapture, press on the crop button, frame the barcode using the crop tool, and that is all.
For permissions reasons, BarCapture is not demoable as an Applet, so you need to...
Download a standalone version and run it directly on your computer.
Beside is a snapshot of the BarCapture product.