HTML Formatter
Indent, prettify or minify HTML, XML and JSX. 100% client-side — your markup never leaves the browser.
About HTML Formatter
The HTML Formatter indents and prettifies HTML, XML and JSX markup, including the JavaScript and CSS inside inline `<script>` and `<style>` blocks. Paste minified build output or one-line CMS markup and get back readable source.
Readable nesting makes mismatched containers, dense attributes and embedded resources easier to inspect. Minify mode reverses the presentation for cases where compact output is useful.
Formatting runs in your browser. Although the intent is whitespace-only formatting, whitespace can be meaningful in preformatted or inline text, so generated output should be reviewed before replacing production templates.
This is especially handy when a CMS, email builder or build pipeline emits one long line and you need to find a misplaced closing tag or duplicate attribute quickly without opening a full IDE project.
How HTML Formatter works in practice
- 1Paste the raw HTML, XML or JSX into the input box.
- 2Pick an indent size (2 or 4 spaces).
- 3Click "Format" and copy the output — or minify with a single click.
- 4Scan indented nesting for mismatched tags before pasting anything back into production.
Jobs this tool is built for
- Expand minified page source while diagnosing an unexpected DOM structure.
- Clean up a one-line CMS or email template before making a targeted edit.
- Indent XML configuration so nested elements and closing tags are easier to audit.
- Format a JSX snippet copied from generated output for discussion in a code review.
What you can do here
- Formats HTML, XML and JSX
- Beautifies embedded script and style blocks
- Minify mode for production output
- Configurable indent size (2 or 4 spaces)
- Attribute order preserved by default
Limits and honest caveats
- Formatting occurs locally in the browser, but you should still remove unnecessary secrets or personal data from any source snippet.
- Always review whitespace-sensitive markup, templates and generated JSX before replacing the original.
- The tool formats source text — it does not execute scripts or render the pasted HTML as a live page.
Common questions about HTML Formatter
Will it change my code semantically?
It aims to change only whitespace and presentation. After parsing, the DOM should match for ordinary markup, but review `pre`, inline text and template edge cases.
Does it support Vue or Svelte syntax?
Vue single-file components format reasonably; Svelte-specific syntax is not fully supported.
Can whitespace ever affect the rendered page?
Yes. Whitespace matters inside elements such as `pre`, and spaces between inline elements can affect text flow. Review sensitive templates after formatting.
Does the tool execute scripts in pasted HTML?
No. It treats the input as source to format rather than loading it as a live page.
Should I minify before deploying?
Only for quick one-off compaction. Prefer your normal production build pipeline for apps that already minify HTML as part of deploy.
This page was written by the ToolSink team to explain how HTML Formatter works on this site — it is not syndicated, scraped, or spun from another publisher. How we write tool guides · Site updates · About ToolSink.
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