A phone number copied off a sign by hand often arrives with one digit wrong, and a name read quickly off a badge is easy to mis-hear. Scanning the details instead of copying them fixes both: point a phone at a QR code and it offers to save the name, number and email correctly.
Not every situation calls for the same code: sometimes a contact should be saved for later, sometimes someone needs to call or email right now. This page covers a contact card, a call code and an email code, whichever fits a reception desk, a badge or a service sticker, all working on iPhone and Android without an app, free and permanent.
Making a contact code, from choice to print
Decide what the scan should do
Save a contact (Business card tab), dial a number (Phone), open an email draft (Email) or a text (SMS). Pick the one action you want most.
Keep the details short
For a contact card, a name, one phone and one email cover most needs. Add a company only if people need it to recognize you later.
Use shared details for shared roles
On a reception sign or a service sticker, use the front-desk number and a team inbox rather than one person's mobile. People move on; stickers stay.
Test on iPhone and Android
Check that the contact name reads correctly, that the number dials, and that the email opens with the right address.
Contact card, call or email: choosing the contact QR code
Each code does one thing when scanned. The right one depends on what the person is doing at that moment.
Contact card (vCard)
Saves name, phone, email and company in one tap. Best for badges, cards and anywhere people will want you later.
Phone call
Opens the dialer with your number filled in; the phone asks before calling. Best on a breakdown sticker, a parking sign or a lost-property notice.
Email
Opens a new message to your address with an optional subject. On a machine, set the subject to its serial number and every request arrives labeled.
Contact codes in email signatures and on screens
A code in an email signature serves the reader at a desk who wants you on their phone: they point the phone at the screen and save you. Insert the PNG at about 100 pixels wide and keep your number and email as text beside it, because many email clients hide images until the reader allows them.
On a video call or a slide, show the code for long enough that people can find their phone, and leave it up while you talk.
What each kind of contact code contains
A contact card is a vCard block with one line per field. A call code is tel: followed by the number in international format. An email code is mailto: followed by the address, with the subject after a question mark, as in the sample. The camera reads all three without an app, and none passes through MakeQR.
mailto:service@harborhvac.com?subject=HX-2041Sizes for badges, signs and equipment
Name badges are scanned from half a meter to a meter away, so print 3–4 cm. Door and reception signs at eye level: 8–10 cm. Equipment stickers: 2.5–3 cm on a flat, clean panel, under matte laminate if the surface gets wiped. On a van, keep the code on the rear doors for people standing close, and paint the number large for everyone else.
Print it at least 25 mm (2.5 cm) wide
Contact QR code mistakes on signs and badges
One person's mobile on a shared sign
When that person leaves or changes numbers, every sticker sends calls to the wrong place.
A number without the country code
It saves, but it fails for visitors with foreign phones and for anyone who later calls from abroad. Start with + and the country code.
A code on a curved or shiny surface
Pipes, bottles and glossy panels bend and reflect the pattern. Put the sticker on the flattest, most matte spot you can find.
Can contact details be updated after printing?
A contact card, call or email code carries the details in the pattern, so it is static: free, permanent and unchangeable. That suits badges and cards you reprint anyway.
For a van, a sign or a sticker that stays up for years, consider pointing a dynamic code at a contact page on your own website instead. A new number then means a website edit rather than new stickers. That needs a free account; two dynamic codes are free forever.
How dynamic QR codes workPlaces contact codes earn their keep
- A heating company sticks a code on every boiler it services that opens an email to support with the unit's serial number as the subject.
- A conference prints a contact card code on each speaker's badge.
- A clinic puts a call code for its after-hours line on the front door.
- A consultant adds a small contact code to her email signature for readers at their desks.