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I use SecScanQR, which is great for translating QR-codes to and from text. It also works for other kinds of barcodes. You can get SecScanQR here: https://f-droid.org/en/packages/de.t_dankworth.secscanqr/ That's in the F-Droid repository, a huge repository of free and open source apps for Android. If you're looking for Android apps that don't track you and don't have other anti-features, F-Droid is a great first stop! Cheers, Owen