No. Formatting, conversion and preview work happens in your browser.

What should I check before publishing?

Review syntax errors, warnings, rendered previews and minified output before pasting changes into production code.

HTML Formatter Online

HTML Formatter

Run Prettier on HTML while preserving source markup.

Input

HTML

Output

HTMLread only

Input size

88 B

Output size

Saved

HTML Formatter runs Prettier in the browser to normalize nested tags, attributes and text spacing without sending snippets to a server.

The work runs locally in your browser. Use the sample, review errors or warnings, then copy or download the result without signing in.

html formatterhtml formatter onlinedeveloper formatter

Formatting preserves markup. Preview-oriented tools sanitize rendered output separately; this formatter is for source cleanup.

Format CSS blocks and declarations for cleaner frontend handoff.

Apply lightweight JavaScript spacing for readable snippets and examples.

Convert Markdown into HTML for docs, CMS previews and publishing workflows.

Convert simple HTML snippets into Markdown for docs and notes.