The redesigned website will launch next week, with the homepage, sport, travel and news sections the first to adopt a new look, which includes a scaled-down version of the media company's logo and a new page design.
The redesigned site will subsequently be introduced across other sections of the website.
The overhaul of the site, which was undertaken by an in-house technology team plus editorial and commercial staff, will allow the group to offer new ad formats and allow it to offer more commercial content partnerships.
Paul Cheesbrough, chief information officer at TMG, said: "The redesign incorporates a number of updates around the ways our users can find, navigate and enjoy our content.
"In addition to this, we've also overhauled the way the site operates, which will, over time, lead to a faster, richer and more immersive user experience."
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