It�s almost impossible to build a website design and know that it is going to convert, obviously when all principles are followed it should convert but there is no way of really knowing. Often you will also find that a designer has 2 website designs that they like for your business and you have to choose which one to use. Well with Google�s website optimizer this is no longer the case and you can start testing different website designs for free.
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a b testing | google website optimizer