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How to scan barcodes from the mobile screen itself?

Edit on Mar 10, 2020: I am also looking to do the same for QR codes.

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3 Answers 3

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As already described in the above comments, this would require taking a screenshot and saving it as an image file. Having done that, there are several barcode scanners available in the Play Store supporting "loading" of barcodes from image files, as e.g. QR BARCODE SCANNER. QR Droid also seems to be capable of what you're looking for:

Scan QR codes from your camera, browser, SD card, or saved image

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An open-source, ad-free alternative QR & barcode scanner and generator is SecScanQR. It's free, high-quality, and user-friendly.

Though there is no button to load images within the app itself, sharing an image to it from any other app, e.g. your photo gallery, will make it scan the image for QR codes. If the QR is on a website or other app, taking a screenshot an immediately sharing that to SecScanQR works perfectly. The result is the same as if you had just scanned it in the app.

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I'm frequently using Manatee Works 'Barcode Scanners' app for such a purpose. Here's the Google Play Store link to the demonstration application.

The app supports a wide variety of 1D/2D codes, scans very fast, and is free. The only downside is that the option to manipulate the results is few, namely either copy or email, because it's a mere demonstration.

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