Hundreds of people have taken the trouble to download the 16-page display, which was compiled by Lambeth libraries in association with the Wiener Library.
The exhibition features terrible pictures of concentration camp victims as they are transported to the camps and, in two truly moving images, the shoes and spectacles they left behind after being murdered.
Jan Bild, the libraries community services manager, said: 'Working on the display was very hard. The images, particularly of the children, are searing. However, it is vital that the truth should be brought to as many people as possible through our most modern communications tool, the council's website. The message - that this must never happen again - remains constant, though the way that message is delivered needs to move with the times.'
The exhibition was designed to complement the commemoration of Holocaust Memorial Day on Saturday 27 January. This event was marked in Lambeth with a ceremony featuring Holocaust survivors and civic and religious leaders.
Tom Franklin, leader of Lambeth Council, said: 'It is extremely heartening to hear of the impact that the display on the internet has had. The images are stark and upsetting and we make no apology for their use. Our duty - as a council, as individuals - is to make sure every new generation is given the truth of the most terrible event in human history.'