Puddletag is a graphical audio file metadata editor ("tagger") for Unix-like operating systems. It is free and open-source software subject to the terms of the GNU General Public License (GPL) version 3. In most major desktop Linux distributions, it is available from standard package repositories. Under Arch Linux(-based ones) it can be obtained from community repositories. Puddletag is written in Python and uses Qt 5 (through PyQt) for its graphical user interface. As backend it utilizes Mutagen, a Python module to handle audio metadata.