Scan, and the chat opens with your number in it
A customer standing in front of your closed shop at seven in the evening will not save a phone number, and half of them will not ring you tomorrow either. They will send a message, if sending one takes a single tap. Put your number in the field below, add the first line for them, and print what comes out.
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The pattern holds a wa.me address: your phone number in international form, with your message attached after the text parameter if you wrote one. A phone reads the code, shows the link as a banner, and a tap opens WhatsApp with a chat to your number already on screen and your text sitting in the compose box, unsent. The reader can change every word of it before pressing send, and plenty of them will. On a device without WhatsApp, or on a laptop, wa.me loads a web page offering WhatsApp Web or the app download instead. Worth saying clearly: this is not the code under Linked devices in the app, which logs a computer in and has nothing to do with this page.
The quiet zone is four modules of clear space on every side, and cropping it away is still the commonest way to print a dead code. Size is the reading distance divided by ten, so a card handed over at 30 cm needs about 3 cm and a van door read from two metres needs about 20 cm. Keep the code dark on a light background. A long prefilled message lengthens the address and makes the pattern denser, which matters on a small sticker, so trim the text before you blame the printer. If you add a logo, keep error correction at Q or push it to H. Two limits: the number is fixed inside the pattern, so a change of number means a reprint, and the code counts nothing, since only the editable codes on this site report scans. A curved van door also takes a little more size than a flat surface, because the outer rows of the pattern sit at an angle to the camera.
Enter the number the way wa.me wants it: country code first, digits only, no plus sign, no spaces, no brackets, no dashes, and no national trunk zero. A UK mobile written 07700 900123 goes in as 447700900123. A German number written 0151 23456789 goes in as 4915123456789. If the number is not registered with WhatsApp, or the digits are wrong, the scanner sees a page saying the phone number is invalid, which is why the test scan matters more here than on a contact card code.
The prefilled message is a label as much as a greeting. Write it so it tells you where the person was standing: one wording for the window, one for the delivery note, one for the van. The customer can edit it, and some will delete it, but enough leave it alone that you get a rough idea of which placement is doing the work, which is the nearest thing to tracking a static code offers. Keep it under about fifteen words. One more thing before the stickers go on the van: a number that starts receiving first messages from strangers needs a greeting message set up in WhatsApp Business, otherwise the scan at nine in the evening gets silence, and the person who scanned decides you are shut. The usual print checks are in 10 things to know before printing QR codes.
No. The chat opens with your text already in the compose box, and nothing leaves the phone until the reader presses send. They can edit or delete the text first. Treat the prefilled line as a suggestion that saves them thinking of an opening, not as a message you have sent.
Country code first, then the number, digits only. Drop the plus sign, the spaces, the brackets and the national zero. 07700 900123 in the UK becomes 447700900123. The number also has to be registered with WhatsApp, or the link shows an invalid number page instead of a chat.
The wa.me address opens in their browser and offers WhatsApp Web or the app download. They land somewhere sensible rather than on an error, but the conversation does not start. If a large part of your customers are not on WhatsApp, a phone or email code is a safer choice for that placement.
Not with a code from this page. The address is held inside the pattern, so a new number means a new code and new stickers. If the number might change, or several people will answer in turn, point the code at an editable link instead and redirect it when you need to.
No. WhatsApp shows two of its own: the code under Linked devices, which signs a computer into your account, and the contact code that shares your profile. Neither is meant for a shop window. A code built here is a plain link that any phone camera can read, including one with no WhatsApp account signed in.
Divide the distance people read it from by ten. Two metres away on a parked van means roughly 20 cm across, plus the clear margin. Go larger if the surface curves or the vehicle is usually seen in motion, and use a matt laminate, because a gloss finish throws a reflection straight back at the camera.
