What is an HTML formatter?

An HTML formatter (also called a beautifier) re-indents and structures raw HTML so it is consistent, readable and easier to maintain.

Is the tool free and private?

Yes. The studio is 100% free and runs entirely client-side – your HTML never leaves your browser.

Why should I validate HTML?

Validation catches missing tags, duplicate IDs, invalid nesting and deprecated elements that hurt SEO, accessibility and cross-browser rendering.

What is HTML minification?

Minification removes whitespace, comments and redundant characters to reduce file size and improve page-load performance.

Does it work offline?

Yes – once the page is loaded, all processing happens locally in your browser.

HTML Formatter & Code Quality Studio – Beautify, Validate, Minify & Audit HTML Online

HTML Formatter & Code Quality Studio

Format, validate, optimize, analyze and improve HTML instantly. 14 pro tools in one fast, private, browser-based studio – built for developers, designers and SEO professionals.

Privacy First Works Offline No Upload Required Client-Side Processing Free Forever

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HTML Formatter

Beautify messy HTML with custom indentation, line-length wrapping and comment preservation.

Indent size Spaces Tabs Max line Preserve comments Preserve blank lines

HTML Minifier

Remove whitespace, comments and redundant attributes to shrink your HTML payload.

Remove comments Collapse attributes Minify inline CSS Minify inline JS

Original size

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Minified size

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Saved

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Reduction

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HTML Validator

Catches missing closing tags, invalid nesting, duplicate IDs, deprecated tags, missing required attributes and more.

Run the validator to see results.

HTML Cleaner

Remove junk markup pasted from Word, Google Docs or legacy editors.

DOM Tree Visualizer

Click "Build Tree" to render the document hierarchy.

Accessibility Auditor

SEO Analyzer

Performance Analyzer

HTML → JSX / Markdown

JSX Markdown

JSX: converts class→className, for→htmlFor, inline styles to JSX style objects, boolean & self-closing tags. Markdown: headings, lists, tables, links, images and code blocks.

HTML Entity Tool

Encodes < > & " ' and named/numeric entities. Supports bulk content from the input editor.

Document Outline

Run Generate to extract H1–H6 hierarchy.

HTML Diff Checker

Compare the Input editor (Version A) against the Output editor (Version B). Added, removed and modified lines are highlighted.

Compare to view differences.

Code Quality Score

AI Insights

Ready when you are

Paste your HTML and click Generate to receive human-readable issues, recommendations and estimated impact – produced fully on-device.