HTML Formatter

The HTML Formatter provides a reliable path from messy or minified markup to clean, readable HTML. It targets developers, editors, and CMS teams who need consistent indentation and attribute formatting to facilitate reviews and collaboration. The tool preserves semantics while improving visual structure to ease maintenance and handoffs.
Core processing occurs in three stages: tokenization, tree construction, and pretty-print emission. It preserves DOCTYPE and comments, and keeps content inside pre, code, and script blocks intact. Required features include fixed indentation (2 or 4 spaces), stable attribute order, and correct handling of self-closing tags. Optional capabilities include minification, customizable quote styles for attributes, and attribute alignment. The approach ensures deterministic output across diverse inputs and environments.
Inputs are provided as HTML strings with optional formatting preferences; outputs include a formatted HTML string and a lightweight diagnostic set. The tool focuses on formatting accuracy and structural parity rather than semantic validation, and it tolerates imperfect input by recovering gracefully and reporting issues for developer review. It is designed to integrate into pipelines where readable markup accelerates testing, templating, and content QA.
Ideal use cases include preparing production templates, cleaning up user-submitted markup, and generating consistent markup for emails or CMS pages. Its value comes from maintaining semantics while delivering predictable formatting rules, reducing review cycles and improving cross-team collaboration.