Hundreds of oil paintings from the gallery's collection including works by Monet, Pissarro and Evan Walters are among those included on the BBC website 'Your Paintings' devoted to the arts.
Glynn Vivian Art Gallery has over 600 artworks available to view online including 20th century paintings by Barbara Hepworth, Ben Nicholson and Paul Nash alongside Welsh artists such as Ceri Richards, Gwen John and Augustus John.
The famous Brangwyn Hall panels have also been photographed to form part of the online collection.
Many of the Swansea-based works included date back to the 18th Century.
More than 210,000 paintings from over 2,800 collections have now been added nationwide.
Swansea Council has worked closely alongside the Public Catalogue Foundation and the BBC on the city's contribution to the website. The aim of the Public Catalogue Foundation, a registered charity set up in 2003, is to make all oil paintings held in public collection across the UK accessible.