120 invitations already sent.
Then the venue changed.
The card never printed the address. Just a QR: "scan for venue & directions."
Change where the code points. Same card, new directions. Zero reprints.
Your shop door sticker on a normal day vs. the day you're home sick.
Same sticker. You changed what it says from your phone, in bed.
People scanning it don't get old hours or a dead page. They get "Closed today, back tomorrow at 9."
5 checks before you print a QR code:
1. At least 2 cm wide (width ≥ distance ÷ 10)
2. Dark code, light background
3. Blank margin around it
4. Test the proof on two phones
5. Use a link you can change after printing
Which one do people skip most?
Rule of thumb for printing a QR code: make it at least 1/10 of the distance people scan it from.
Table card, 30 cm away → 3 cm
Poster, 2 m away → 20 cm
Shop window, 5 m away → 50 cm
Which one do you see done wrong the most?