Always test-scan with a phone camera before printing a big batch. For print, SVG stays sharp at any size; keep the code at least 2 cm (0.8 in) wide, and bigger for posters seen from a distance (about 1/10 of the scanning distance).
Your site (sample page)
Where to paste it
- Blogger: Layout → Add a Gadget (sidebar or footer) → HTML/JavaScript → paste → Save.
- WordPress: a Custom HTML widget or block.
- Wix / Squarespace / other: an "Embed code" / "Custom HTML" element.
- Hand-coded site: paste inside <body> where it should appear (anywhere, for the floating button).
The QR code is drawn in the visitor's browser: no QR service, no sign-up, and it never expires.

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