More than £140,000 was raised for the London Marathon through the web site Justgiving.com.
It is the first year that the site has partnered with the Flora London Marathon to allow runners to build free web pages to accept secure pledges and donations and reclaim a 28 per cent Gift Aid bonus.
"We didn't really have a target as this is the first time that the marathon has promoted the site as an online fundraising service and we didn't know what to expect,
said Anne-Marie Huby, director of strategy at Justgiving.com.
"We entered the partnership in January after all the promotional material and information packs had gone out to the runners, so the response we got was very encouraging."
Runners used the service to customise a Justgiving.com web site template to include personal details and a target amount they aimed to raise for their chosen charity. The web page could then be emailed to friends and family who could pledge a donation by entering their credit card details.
"The system is designed to help cut down on any hassle the runners may have collecting funds. As soon as someone crosses the line, their pledges are automatically credited to their account with every penny going directly to the charity,
"We learned a lot from this first year about what the runners and the charities want out of the service,
Justgiving.com aims to improve the service by providing additional helpdesk support and customising the site to give more information about security issues, she added.