Anyone who visits the Subway website, accepts cookies from the site and provides an email address, will be emailed a digital coupon featuring a QR code that can be presented at a Subway store for a free cookie.
Sacha Clark, marketing director for the Subway brand UK and Ireland, said: "Our customers are at the centre of everything we do and we want to thank and reward them for their loyalty in an innovative – and delicious - way.
"What better than cookies for cookies to show our appreciation?"
Messages asking web users to accept cookies have been a familiar sight since 2011, when an EU directive came into force that required websites to give users the option to opt out.
In December the European Commission . Companies no longer need to ask for content for using "non-privacy intrusive" cookies, such as those which remember shopping cart history or filling in forms over multiple web pages.
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