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If you're in Europe and just got the paper certificate after your vaccination (like here in France) you can just scan the QR code with any scanner (such as the one included in the Firefox android app), copy the passphrase and paste it on this open source tool https://www.nayuki.io/page/qr-code-generator-library and re-generate the exact same QR code (using the 'Quartile' error correction) in a better resolution and keep this as an image on your phone.