ROMANCE can automatically convert batches of CE-MS files from the time scale into the electrophoretic mobility scale. It works with the new standard mzML format for MS data, so it can be transparently incorporated into any existing data treatment workflow. The software accepts MS(/MS) data in both centroid or profile format. The software can convert data by using the separation voltage, capillary length and m/z of a marker peak. Such marker can be either a neutral molecule (EOF marker, electrophoretic mobility = 0) or a known mobility compound. The converted files are written in the electrophoretic mobility scale, thus correcting most of the experimental sources of variation and making possible intra- and inter-laboratory comparison and data exchange, provided that the same BGE is used.