Tools
Email signature builder.
Pick one of your vCard QRs. Copy the HTML to Gmail / Outlook web. Or download a .htm file you can import into Outlook desktop. Your QR keeps working even when you change roles.
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No vCard QRs yet
Create a vCard Plus QR first, then come back here to turn it into an email signature.
Create a vCard Plus QR
Outlook desktop: File → Options → Mail → Signatures → New, paste the HTML.
Gmail: Settings (gear icon) → See all settings → Signature → paste.
Apple Mail: Settings → Signatures → drag the .htm file in.