HTML Formatter & Validator
Help & Examples
Use the options above to format your HTML and perform advanced analysis. Below are before→after examples of the core formatter plus each feature:
Core Formatter
Input HTML:
<div class="wrapper"><p>Hello</p><img src="img.jpg"/></div>Formatted Output:
<div class="wrapper">
<p>
Hello
</p>
<img src="img.jpg"/>
</div>1. Validation Report
Input:
<div class="wrapper"><p>Hello</p><img src="img.jpg"></div>Output:
Total tags: 3
Unique tags: {'div': 1, 'p': 1, 'img': 1}
Images missing alt: 1
Internal links: 0
External links: 02. Extracted Links
Input:
<a href="/home">Home</a>
<a href="https://example.com">Example</a>Output:
Home → /home
Example → https://example.com3. Images Listing
Input:
<img src="/logo.png" alt="Logo">
<img src="/banner.jpg">Output:
src: /logo.png, alt: "Logo"
src: /banner.jpg, alt: ""Tip: Always include meaningful alt text for accessibility.
4. Headings Outline
Input:
<h1>Main</h1>
<h2>Sub</h2>
<h3>Section</h3>Output:
1. H1: Main
2. H2: Sub
3. H3: SectionWhy it matters: Proper heading structure boosts SEO and readability.
5. IDs & Classes Used
Input:
<div id="main" class="container highlight">…</div>Output:
IDs: main
Classes: container, highlightPro Tip: Use this audit to clean up unused selectors in your CSS.
Why These Insights Matter
- Readability: Clean, indented HTML is easier to scan and debug.
- Accessibility: Catch missing
alttags and enforce semantic structure. - SEO: Maintain clear heading hierarchies and healthy link ratios.
- Maintainability: Identify CSS hook points (IDs & classes) for refactoring.
- Collaboration: Share a standardized codebase that everyone can understand.
Integrate this tool into your workflow to catch errors early, enforce best practices, and keep your HTML clean, accessible, and optimized.