HTML Formatter

This HTML formatter analyzes input HTML code and outputs a clean, uniformly indented version. It preserves document structure, DOCTYPE, comments, and preformatted blocks while applying a consistent indentation level and line-wrapping policy. The tool is designed for developers who want predictable formatting across files and teams, code reviews, and automated quality checks. It supports single-document formatting and batch processing when integrated into pipelines.
Conceptually, the formatter parses HTML into a tree, normalizes whitespace, and applies formatting rules to each node. It preserves the logical order of elements, handles void elements, keeps script and style blocks intact, and can limit line length. Attributes can be wrapped to improve readability, and an indentation size can be configured. The result is a canonical version that reduces diffs and makes changes easier to review.
Who benefits include frontend developers, QA engineers, and teams enforcing a shared style. It is useful when converting messy legacy HTML, preparing code for tutorials, or integrating into CI pipelines as a step that rejects unformatted output.
Core features include configurable indentation (2 or 4 spaces), optional attribute wrapping, preservation of preformatted content, DOCTYPE and comment handling, and a non-destructive approach that never changes content semantics. Use cases range from one-off formatting to large-scale repository cleanups.
Implementation notes include streaming processing for large files, deterministic results, and no reliance on external services.