Where images of our collections are available online there will be a link in the catalogue. There are groups of material that have been digitised, such as:
Most of our digitised images conform to the IIIF apis for image delivery and presentation
A visual browser - jalava - is available to look across the available material.
The top level collection manifest is at https://iiif.durham.ac.uk/manifests/trifle/collection/index