idGenerator provides an automated tool to generate identifiers (IDs) with multiple features, particularly for modern epidemiological or clinical studies. The software enables the generation of structured IDs to facilitate study organization, layered IDs to enhance data protection, and check digits to detect entry errors. It is easy to utilize due to a user-friendly graphic user interface and practical by providing IDs as standard text and 128B barcode. idGenerator addresses towards small to medium epidemiologic or clinical studies in need of a simple yet secure concept and tool for ID creation management. The software may be used by study personnel without programming training on a standard Windows computer. The software was originally developed for the AugUR (Age-related diseases: understanding genetic and non-genetic influences - a study at the University of Regensburg) study by the Genetic Epidemiology Department within the University of Regensburg. Links of interest: [Genetic Epidemiology Department at the University of Regensburg][2] [AugUR Study Homepage][3] [AugUR study design paper on Pubmed][4] [1]: http://www.uni-regensburg.de [2]: http://www.uni-regensburg.de/medizin/epidemiologie-praeventivmedizin/genetische-epidemiologie/index.html [3]: http://www.uni-regensburg.de/medizin/epidemiologie-praeventivmedizin/genetische-epidemiologie/augur/index.html [4]: http://www.ncbi.nlm.nih.gov/pubmed/26489512