Microsoft has released a free tool that lets website owners spot when images of child abuse are being shared by users.
It said it had made the PhotoDNA tool available to tackle the 720,000 abuse images uploaded to the net every day.
Microsoft said the online tool was for small firms that lack the resources to do image-checking themselves.
Many large social networks such as Twitter, Facebook and Flipboard were already using PhotoDNA, before now it had not been available to smaller online services
The PhotoDNA system has been used to analyse and classify images of child sexual abuse held by Interpol, police forces and the US National Center of Missing and Exploited Children.
Many of the images shared online have been seen before and spotting people trading them can help police forces unearth abusers previously unknown to them.
The free service puts PhotoDNA in the cloud and lets websites check images uploaded by users.
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