We here presented psm_utils, a Python package that greatly simplifies downstream usage of peptide identifications, regardless of PSM file format. The Python package is convenient to use in any data analysis tool that handles PSMs, and the command line interface can easily be embedded in automated workflows. The web application brings the ability to interconvert or quickly inspect any supported PSM file type to any researcher in the field. psm_utils is set up as an open and dynamic project and we welcome everyone in the computational proteomics community to make use of, and contribute to, the project.