Before you print
How big should it be?
Rule of thumb: printed width ≥ scanning distance ÷ 10. Pick the surface above and the studio sizes the code for you, then checks the printed module size against what a press can actually hold.
Questions people actually ask
No — the phone opens its dialer with your number filled in, and the scanner taps to call. Phones deliberately never dial automatically, which protects people from surprise premium calls.
Yes, always — write the number in international format like +14155552671. Without the country code, the number only dials correctly for people in the same country.
As long as the phone number works. A static code is just the number encoded as squares — it never expires and does not depend on UseQR at all.
Yes — free forever, no signup, no watermark. The code is generated entirely in your browser and your number is never sent to our servers.
Want the detail? How phone call QR codes work — the payload format, what scanners do with it, and where it breaks.