HTML Formatter Online

The HTML Formatter Online accepts HTML input and outputs a consistently formatted or minified version. It targets developers, educators, editors, and learners who require clean, standards-compliant markup for documentation, tutorials, or production code. It supports HTML5 semantics, void elements, and both pretty and minified output. By default, it preserves inline script and style content while applying formatting rules to the surrounding markup. The tool aims for predictable whitespace, consistent attribute spacing, and reproducible results across runs.
Conceptually, it parses the input, constructs a logical representation of the DOM, and serializes it with the chosen rules. In Pretty mode, it applies uniform indentation, line breaks between elements, and consistent attribute spacing while preserving the content of script and style blocks. In Minify mode, it reduces whitespace and collapses spacing without altering semantics.
Key differentiators include idempotent formatting, robust HTML5 support, preservation of inline block content, and fine-grained options for wrapping attributes and DOCTYPE handling. It supports use cases from producing production-ready HTML and teaching snippets to auditing legacy markup. The output is plain HTML text suitable for embedding in code, docs, or version-controlled repositories.