The out of copyright books are being provided via Google Books and can be downloaded for free from Coolerbooks website. The books are available in 19 different formats, including EPUB and PDF, and MP3 for audio books. The website also offers users the chance to preview many of the ebooks on offer, before deciding whether to purchase the title.
Coolerbooks.com is run by Interead, which also created the COOL-ER reader.
Interead claimed the deal makes Coolerbooks the largest ebookstore in the world.
"We want everyone to be able to enjoy the content on Coolerbooks, so even if you don't own one of our Cool-er e-readers you can still download your favourite titles," said Neil Jones, founder of Interead.
"Our partnership with Google allows us to offer more content than anyone else, as well as giving readers the freedom to have a look through ebooks that they might be interested in. We're extremely proud to be the first ebookstore outside the US to partner with Google Books, and we hope that the collaboration will make the appeal and accessibility of ebooks broader than ever."