Pitchford, who is to take up a new post focusing on media innovation at brand development agency The Storm Creative, will be succeeded by the site's features editor, Adam Rothwell.
The organisation applied for charitable status in September and last month warned site users that it may have to change the focus of its blog in order to qualify (Third Sector, 23 April).
Neill Ghosh, Intelligent Giving's chair, admitted the registration had not been an easy process. "It's been a long slog finally to get this far," he said.
He added that the organisation will be making some changes to its website in order to satisfy the commission's demands, but that he did not anticipate a radical overhaul.
"We will still be able to write our Blog - and we will still be able to encourage charities to perform more efficiently," he said. "But we will draw a stronger line between what's our opinion, and what is based on objective research."