I would say 1 foot square. You'll get that from a fair distance and it's not so big that it will look stupid.
But to be fair, if they are going to point a camera phone at your van, they would surely just photograph your number and web address which I assume are already sign written on it?
Before you do, you're aware there are different types of content that can be encoded? e.g just a website, or a full business card with phone numbers/website/email
How much information you encode into it determines the density of the dots, also you can add extra error-correction (makes it slightly larger) which might help if they get a blurry snap of it as you speed past.
See if this has more options than the generator you used.
That sounds about right to me from ones I have seen in public places.
People may not think of photographing the van, even assuming that the result would be legible. However, many are used to the concept of using a QR tag.
How long is a piece of string? How far away are the people when trying to note your details?
Most phones have fixed fairly wide angle lenses, playing here I reckon that if people can stand next to your van something about 6" square is about right.
But why aren't they simply taking a photo of the van side? Or do you want to easily lead them to your website, saving them typing in the URL?
Because the QR generation are a bunch of lazy fckrs who want their information handed to them on a plate? Just the kind of people who Dave could make a mint from.
Nobody's mentioned the biggest drawback though, he'll need to wash the van.
Yes, when I'm walking in the street and see a QR code, I'm obviously going to want to immediately stop whatever it is that I'm doing and proceed straight to the website without passing 'Go'. ;-)
If I happen to have something capable of taking a photo to hand, then a photo of a URL does the job. If I don't, then it's far easier to either remember a URL for later, or to scribble it down on a piece of paper, back of my hand etc.
As much as anything, it is good marketing. A QR code on a van suggests a business that is up to date and modern in outlook.
The downside is that anyone using a QR code ought to be taken to a mobile optimised web site. A lot of people still use mobiles with 300 pixel wide screens (about 75% of the mobile hits on my site are from those) and they need a quite different approach to site design.
My only further suggestion would be to not let the tag appear too dominant in your vehicle signage, big enough and prominent enough for those in the know to spot it and use it but not so dominant as to alienate the inevitable QR haters who will feel they are missing out on something.
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