What file utility that transforms the contents of a file or data from one format to another?

A file utility that transforms the contents of a file or data from one format to another is commonly referred to as a "file converter." File converters can handle various types of data, including text, images, audio, and video, enabling users to convert files between formats such as PDF to Word, JPEG to PNG, or MP3 to WAV. These tools can be standalone applications or integrated features within software programs and often provide options for customizing the output format.