CSSO (CSS Optimizer) is a CSS minifier. It performs three sort of transformations: cleaning (removing redundant), compression (replacement for shorter form) and restructuring (merge of declarations, rulesets and so on). npm install csso Try it out Maintainers Roman Dvornov Authors Initial idea — Vitaly Harisov (vitaly@harisov.name) Implementation — Sergey Kryzhanovsky (skryzhanovsky@ya.ru) English