The shopping comparison site was launched in 2000 and acquired by Yahoo in 2004. It attracts more than ten million unique UK users each month.
Brands2Life has been briefed to drive momentum in key shopping categories, including electronics and computing, fashion, home and garden, and sport.
The agency will target customers at specific 'life stages', with different campaigns planned for each group. The PR strategy will also promote Kelkoo's security and delivery standard and support the website's relationship with various merchants.
'Kelkoo is currently perceived as just a price comparison site,' said Brands2Life co-head of consumer Alex Williams, who will lead the account.
'Our strategy is to highlight the value-added benefits of using Kelkoo. We will target savvy shoppers who are not only looking for a great deal but also want an enhanced "mouse to house" service from online retailers.'
The win follows Brands2Life's recent appointment to promote Tesco's non-food and Tesco Direct offerings (PRWeek, 31 October 2007).