HTML Beautifier Guide: Format and Indent HTML Code Online (2026)

Unformatted HTML is difficult to work with. Here is why beautification matters:

• Debugging — Finding a missing closing tag in a 500-line single-line HTML file is nearly impossible. Proper indentation makes the structure visible.
• Code review — Reviewers can spot issues faster when code is cleanly formatted. Messy code hides bugs.
• Onboarding — New team members understand code structure faster when it is properly indented.
• CMS output — WordPress, Shopify, and other CMS platforms often output poorly formatted HTML. Beautification helps when debugging theme issues.
• Vendor code — Third-party widgets and embed codes are typically minified. Beautify to understand what they do before adding to your site.

The tool applies these transformations to your HTML:

Before and After

// Before (minified)
<div class="card"><h2>Title</h2><p>Content here</p><a href="/link">Read more</a></div>

// After (beautified)
<div class="card">
  <h2>Title</h2>
  <p>Content here</p>
  <a href="/link">Read more</a>
</div>

The beautifier offers several formatting options. Here is what each does:

Beautification fits into specific points in the development workflow:

• Debugging production — View source on a production page, copy the HTML, beautify to read the structure
• Before code review — If the code is not auto-formatted, beautify before submitting for review
• Inspecting third-party code — Beautify embed codes, widget HTML, or vendor scripts before adding to your codebase
• After CMS export — Clean up HTML exported from WordPress, Webflow, or other visual builders
• Template cleanup — Reformat email templates and HTML newsletters for editing

Instead of manually beautifying, set up auto-formatting in your development environment:

VS Code

Install the Prettier extension. Add to settings.json:

{
  "editor.formatOnSave": true,
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "[html]": {
    "editor.defaultFormatter": "esbenp.prettier-vscode"
  }
}

.editorconfig

[*.html]
indent_style = space
indent_size = 2
end_of_line = lf
insert_final_newline = true

With auto-formatting, every save beautifies your HTML automatically. The online tool is useful when you do not have your IDE available or when working with HTML snippets outside your project.