Is there an app that scans with your own phone a QR code that appears in an app or browser on the same phone?
Not sure whether this is the workflow you are looking for, but I could do a screenshot of firefox showing https://en.wikipedia.org/wiki/Barcode (I enlarged the respecitive area), send the screenshot from the gallery to SeqScanQR and then send the decoded UPC-A barcode (036000291452) via email.
I hope your staying safe and enjoying the open source world!!
To scan a QR code from the same phone, take a screenshot of the QR code and go to https://zxing.org/w/decode.jspx. Once your there, upload your screenshot and it should bring you to where your screenshot is supposed to go.
I hoped I helped!
No need to send it to some site as QR apps, eg. Binary Eye can just load a screenshot from the device.
Ahh! Looks like I just learned something!