A terabyte is one trillion bytes.

Features added to the redesigned site include a slide show mode and support for up to three minutes of HD quality video (per movie).

In a blog to launch the new site Flickr claims: ‘No limited pixels, no cramped formats, no memories that fall flat. We’re giving your memories room to breathe and you the space to upload a dizzying number of photos and videos, for free.

‘Just how big is a terabyte? Well, you could take a photo every hour for forty years without filling one.’

Users can upload photos at up to 200MB per photo (1GB video limit).

However, it will cost $49.99 per year (twice the previous cost of Flickr Pro membership) for users who choose not to see adverts, and $499.99 for those wanting 2TB of space.

Changes also see the ending of Flickr Pro for new users to buy, though Flickr says many of the ‘Pro-only’ features are now available for free.

Unlimited storage will be offered to those with an existing Flickr Pro account.

Amateur photographers gave a cautious thumbs-up to the revamp, with initial reaction somewhat mixed from members of the Amateur Photographer website forum.

For more details see the Flickr blog and website