When should I use 4-space vs 2-space HTML indentation?

Use 4-space for documentation, tutorials, and legacy codebases that already use it. Use 2-space for modern web projects and frameworks.

Can I switch from 2-space to 4-space formatting?

Yes. Paste your 2-space indented HTML and select 4-space. The formatter reindents the whole file automatically.

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HTML Formatter with 4-Space Indentation

Some teams and style guides prefer four-space indentation for its visual clarity — each nested level is unmistakably distinct. FixTools formats your HTML with exactly 4 spaces per indent level, perfect for documentation, tutorials, and legacy enterprise codebases.

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Processing: In your browser
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Strict 4-space indentation

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Better visual clarity for deep nesting

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Ideal for documentation HTML

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How to use this tool

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Paste your HTML, select 4-space indentation, and click Format. The output clearly distinguishes each nesting level for maximum readability.

How It Works

Step-by-step guide to html formatter with 4-space indentation:

1
Paste your HTML
Paste any HTML into the input panel.
2
Select 4-space indentation
Choose the 4-space option in the indent selector.
3
Click Format
The output uses exactly 4 spaces per indentation level.
4
Copy
Copy the 4-space-indented HTML for use in your project.

Real-world examples

Common situations where this approach makes a real difference:

Preparing HTML for a technical documentation site

Documentation sites often present code with 4-space indentation for clarity. Format your HTML examples before inserting them into markdown or documentation tooling.

Legacy enterprise project with 4-space standard

Older codebases standardised on 4-space indentation before 2-space became dominant. Use the formatter to align new files with the existing codebase convention.

When to use this guide

Use this when your team or style guide mandates 4-space indentation, or when creating HTML for documentation where extra visual separation helps readers follow nested structures.

Pro tips

Get better results with these expert suggestions:

4 spaces is easier for beginners to read

When teaching HTML or writing tutorials, 4-space indentation makes the parent-child relationship between elements more obvious at a glance.

Watch line length with 4-space indent

Deep nesting with 4-space indentation can push lines beyond 80 characters. If this is a problem, consider flattening deeply nested structures.

Use 4-space for standalone HTML files

For standalone .html files not part of a JavaScript framework project, 4-space indentation is a common default and helps distinguish the HTML from bundled minified code.