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HTML Beautifier

Turn dense or minified HTML into indented markup for review and diffs. Processing stays in your browser.

Output

FAQ

Parser normalization?

DOMParser rebuilds a tree—browser may reorder attributes or inject implicit `<html>` wrappers for fragments. Expect semantic equivalence, not byte-identical HTML.

Inline SVG or MathML?

Complex namespaces usually survive, but verify specialized attributes after beautify—editors like VS Code may be safer for huge SVG.

`<template>` content?

Inert template contents might serialize differently—spot-check shadow-DOM or framework partials.

Security?

Beautifying does not sanitize XSS—escape user HTML before injecting into pages.

Large email HTML?

May lag; use IDE formatters for multi-megabyte templates.

Privacy?

Runs locally.

🆓100% Free
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Frequently Asked Questionsabout HTML Beautifier

HTML Beautifier is a free browser-based utility on it3.site. Use it when you need fast results without installing desktop software. It is designed for quick daily workflows like content cleanup, format conversion, or validation before publishing.
Yes. HTML Beautifier is free to use. Most processing in it3 tools runs directly in your browser, which helps keep your input private and reduces server dependency.
You provide input, the tool applies client-side logic in JavaScript, and the processed output is shown instantly. For many tools, data is transformed in-memory and cleared when you close or refresh the page.
A common use case is speeding up repetitive work before publishing or sharing: preparing cleaner data, generating developer-ready output, or validating content quality in seconds.
For large inputs, performance depends on your device and browser memory. Keep backups of original content, verify final output before production use, and test on real target environments when needed.
Browser tools are faster to open and easier to use across devices, while desktop apps may support larger batch workflows and advanced automation. For everyday quick tasks, the browser version is usually enough.
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