Fibranet is an online database aiming to facilitate fibre identification studies. It is the main outcome of the Marie Sklodowska Curie project FIBRANET (Fibres in Ancient European Textiles, grant agreement no. 745865) undertaken at the University of Copenhagen in 2017-2019. It includes plant and animal fibres reference (not excavated) samples examined under optical and scanning electron microscopes in longitudinal and cross-sectional views. Untreated fibres are included, as well as a selection of fibres on which degradation experiments were undertaken (burial and carbonisation in a laboratory). Indicative references of different fibres used and/or identified to have been used, in antiquity for textile production from ancient texts and published articles, are also included. Selecting one or more keywords of at least two of the five categories below will produce more accurate search results. The keywords are used to describe the morphology of untreated fibres, as well as phenomena observed after the degradation experiments.