Google has changed its look and logo as the search engine changes to adapt to use on a number of different platforms including mobiles, apps and on smart TVs.

"Google has changed a lot over the past 17 years — from the range of our products to the evolution of their look and feel. And today we're changing things up once again," the company has said as it explained the changes on in blog post.

The new Google logos, which include the same colours and a different font, a multi-coloured 'G' and colourful bars for voice input, are all meant to reflect changes in technology and how users interact with the search engine.

"We've taken the Google logo and branding, which were originally built for a single desktop browser page, and updated them for a world of seamless computing across an endless number of devices and different kinds of inputs," Google says. The rebrand means that the search engine changes its look depending on whether users input using speech, gestures or typing.

Perhaps the biggest visual change to the brand is the removal of the blue Google 'G' and its replacement with a more colourful alternative.

Google explains: "This isn't the first time we've changed our look and it probably won't be the last, but we think today's update is a great reflection of all the ways Google works for you across Search, Maps, Gmail, Chrome and many others. We think we've taken the best of Google (simple, uncluttered, colourful, friendly), and recast it not just for the Google of today, but for the Google of the future."