A man from Bushey pleaded guilty to downloading indecent images of children and possessing extreme pornography.
Ricky Hughes, 30, of Scottswood Close, admitted possessing 60 images - 20 being at Level 4 the second most serious level.
He also admitted possessing a Level 4 movie and an image of extreme pornography that involved sex between a woman and a dog.
In all he pleaded guilty to four charges of making (downloading) indecent images of a child, one of possessing images, one of possessing a Level 4 movie and one of possessing an image of extreme pornography.
St Albans crown court was told he had no previous convictions.
Judge Michael Kay QC adjourned sentence for a probation report until 31 March. He said all sentencing options were open as the offences crossed the "custody threshold."