Tictoc is briefed with making all Mind's publications and products available online, developing online registration for events, online donor facilities, a blog and e-newsletters.
Another part of the brief is to help Mind develop an online community so that users can access peer support through social networks.
Eve Bachrach, web producer at Mind, said: "We chose tictoc because they showed a real understanding of our needs and they have the skills and experience to work with us creatively on all aspects of the redesign process.
"We are really excited to be developing a new website that will be much more interactive and easier for users to navigate, making it as simple as possible for people to get information and advice on mental health issues."