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Developer Tools

HTML Formatter

Format HTML into a readable structure.

Use the tool

Use HTML Formatter to turn compact, pasted, or hard-to-read markup into a structure you can inspect, debug, and share.

Dev Workbench

HTML Formatter

Format HTML into a readable structure.

Input

Result

Run the tool to see output.
Lines: 0Chars: 0

Why use HTML Formatter

  • Beautify minified HTML from a page source, email template, or CMS export.
  • Inspect nested tags while debugging broken layouts or missing closing elements.
  • Clean copied markup before sending it to a developer, QA ticket, or documentation page.
  • Review template output without changing the underlying HTML semantics.

About this tool

HTML beautifier for debugging

HTML Formatter adds indentation and line breaks so markup structure becomes visible. This helps developers and content editors understand nesting, wrapper elements, and repeated blocks.

Useful for CMS and email markup

Pasted HTML from CMS editors, newsletters, widgets, and templates often arrives as one long line. Formatting makes it easier to spot broken sections before editing or reporting an issue.

Formatting is not validation

Formatted output is easier to read, but it does not guarantee the markup is valid for every browser, email client, or template engine. Validate and test after making changes.

Example usage

Input

<div><p>Hello</p><a href="/docs">Docs</a></div>

Output

<div>\n  <p>Hello</p>\n  <a href="/docs">Docs</a>\n</div>

Practical guide for HTML Formatter

Best practices

  • Format before debugging nested wrappers, tables, and copied CMS blocks.
  • Keep a source copy when working with template languages or email markup.
  • Validate and preview the final page after editing formatted HTML.

Common mistakes

  • Treating formatted HTML as automatically valid HTML.
  • Formatting inline SVG or templates without checking whitespace-sensitive output.
  • Deploying formatted production HTML when the workflow expects minified markup.

How this tool works

  1. Step 1

    Open HTML Formatter and review the default example input.

  2. Step 2

    Paste your own input or upload source data when required.

  3. Step 3

    Run HTML Formatter to generate output instantly in the browser.

  4. Step 4

    Verify the output using the preview and formatting helpers on the page.

  5. Step 5

    Copy the final result and continue with a related tool if needed.

Use related links to continue your workflow and keep your output consistent across ToolHarbor pages.

JSON FormatterFormat JSON with readable indentation.HTML MinifierMinify HTML by removing unnecessary spaces.CSS FormatterFormat CSS with consistent spacing and line breaks.HTML to Markdown ConverterConvert HTML blocks into Markdown syntax.Markdown to HTML ConverterConvert Markdown text to clean HTML output.

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FAQ

Does HTML formatting change how the page renders?

It should mainly change whitespace and indentation, but whitespace-sensitive contexts such as pre, code, textarea, SVG, and email markup deserve extra review.

Can this fix invalid HTML?

Formatting can reveal suspicious nesting or missing tags, but it is not a complete HTML validator or browser compatibility test.

Should I format template files as plain HTML?

Be careful. JSX, Blade, Liquid, Vue, Angular, and other template syntaxes may contain expressions that plain HTML formatters do not understand.

When is HTML Formatter most useful?

Use it when source markup is compressed, copied from a CMS, generated by a tool, or difficult to review in one line.