A JavaScript optimizer

The Closure Compiler compiles JavaScript into compact, high-performance code. The compiler removes dead code and rewrites and minimizes what's left so that it downloads and runs quickly. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. These checks and optimizations help you write apps that are less buggy and easier to maintain.

A comprehensive JavaScript library

The Closure Library is a broad, well-tested, modular, and cross-browser JavaScript library. You can pull just what you need from a large set of reusable UI widgets and controls, and from lower-level utilities for DOM manipulation, server communication, animation, data structures, unit testing, rich-text editing, and more. The Closure Library is server-agnostic, and is intended for use with the Closure Compiler.

A JavaScript style checker and style fixer

The Closure Linter enforces the guidelines set by the Google JavaScript Style Guide. The linter handles style issues so that you can focus on coding.

An enhanced stylesheet language

Closure Stylesheets is a system that adds a number of Google extensions to the standard CSS language. With these extensions, you can define and use variables, functions, conditionals, and mixins in your stylesheet, making your stylesheets more readable and maintainable. An included tool can compile the stylesheet down into standard CSS and supports minification, linting, directionality (right-to-left flipping), and class renaming.