This web service compares bacterial and archaeal viruses using their genome or proteome sequences. The results include phylogenomic trees inferred using the Genome-BLAST Distance Phylogeny method (GBDP), with branch support, as well as suggestions for the classification at the species, genus, subfamily and family level. The subfamily rank is only investigated during amino acid-based analyses as detailed in the VICTOR publication. (The service can be applied to other kinds of viruses, too, but has not yet been tested in this respect.) Upload your FASTA files, GenBank files and/or GenBank accession IDs below. The VICTOR methods and principles are described in the accompanying publication. For other details please see the VICTOR FAQ page.