tRex is a database of tRNA-derived short fragments (tRFs) and tRNAs in Arabidopsis thaliana.tRex employs different options for data exploration, including per sample or per tRNA browsing, overview of simplified expression patterns across different samples or tRNAs and full expression profiles at read-level resolution. Each profile view is enabled with dynamic rescaling for different methods of normalization and connected with other pertinent information in an easy to navigate manner.