Fill in the details, add a pet photo, then generate a card for Apple Wallet. Everything happens in your browser - your certificate and photos never leave this device.
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Scanning the card's QR opens this link in a browser. Clear it or untick QR for no QR.
no photo - cat/dog watermark usednone selected
The card is signed right here in your browser. Send the downloaded file to the owner (email/AirDrop) and they tap it to Add to Wallet. Needs an internet connection the first time to load two small libraries.