CSS Style Formatter

The CSS Style Formatter online accepts a CSS string and returns either a beautified or a minified version. It supports configurable indentation (2 or 4 spaces), line ending normalization (LF or CRLF), and optional preservation of comments. Intended users are front-end developers, code reviewers, and teams enforcing a shared style guide. It operates entirely on the input CSS and does not fetch external code; outputs are deterministic for a given configuration, enabling reproducible formatting across environments.
Core processing uses a CSS parser to build an AST, then applies a curated set of formatting rules. In beautify mode, the tool expands rules with consistent indentation, standardized brace placement, and predictable whitespace around colons and semicolons. In minify mode, it removes whitespace and line breaks without altering syntax validity. Optional features include property sorting by a configurable order, deduplication of declarations (last wins), and selective vendor-prefix handling when requested. All transformations preserve syntactic correctness.
Outputs include the transformed CSS string and metadata such as output size in bytes and an approximate compressed size. On syntax errors, the tool reports the error with line and column positions to aid repair. Typical use cases include preparing third-party CSS for production, migrating legacy styles to a team standard, and producing readable CSS during code reviews or documentation.