The catch with “free” QR services
Many free generators create dynamic codes: the pixels point at their server, which redirects to your URL. Later they ask for a subscription or the link dies. QuickImg generates static QR codes. The URL, WiFi string, or vCard is encoded directly. Print it once — it still works next year with no account and no watermark.
WiFi QR how-to
Fill SSID and password, pick WPA for most home routers, download PNG or SVG, print it near the coffee machine. Guests scan and join. You still should not post that PDF on a public website if the network is sensitive.
vCard
A vCard QR stores contact fields so a phone can offer “Add to contacts.” Perfect for networking events without paper scraps.
Print tips
Use SVG for large print runs. Keep high contrast (dark modules on light background). Test-scan from a phone before you order stickers.