The site has been designed by Inferno, which picked up the brief at the beginning of the year.
The overhaul is intended to make Clintoncards.co.uk easier to navigate, and to position the company as a one-stop shop for cards, gifts and flowers. The site also offers a selection of personalised stationery and corporate Christmas cards, which are available via third parties.
Clinton Cards, which has 700 stores, is the UK's biggest retailer of greeting cards and soft toys.