HTML Viewer & Formatter
View, format, and beautify HTML code directly in your browser. Paste raw or minified HTML to get a clean, indented, syntax-highlighted structure. Supports pretty-printing, minification, and validation. Ideal for inspecting server responses, debugging templates, reviewing scraped markup, and validating HTML before publishing. No data is sent to any server.
What is HTML?
HTML (HyperText Markup Language) is the standard language for structuring web pages. It uses a system of tags and attributes to define the structure and meaning of web content. Every webpage you visit is built on HTML — from headings and paragraphs to images, forms, tables, and interactive elements.
HTML5, the current standard, added semantic elements (<header>, <article>, <section>), audio/video support, Canvas API, and improved form controls.
Common HTML Elements
| Tag | Purpose |
|---|---|
| <h1>–<h6> | Headings — hierarchy and SEO |
| <p> | Paragraph of text |
| <a href> | Hyperlink — internal or external |
| <div> | Generic block container |
| <span> | Generic inline container |
| <img src> | Embed an image |
| <form> | User input form element |
| <table> | Tabular data structure |
HTML Best Practices
- Use semantic elements (
<header>,<main>,<footer>) for accessibility and SEO - Always include
altattributes on images for screen readers - Use only one
<h1>per page — it is the primary heading for SEO - Avoid inline styles — use CSS classes for separation of concerns
- Validate your HTML with the W3C Markup Validation Service
- Nested tables for layout are outdated — use CSS Flexbox or Grid instead
Common HTML Viewer Use Cases
Debug Templates
Inspect and format server-rendered HTML to understand the DOM structure.
Scraping Results
Beautify raw scraped HTML to find the selectors and structure you need.
Email Templates
Format and review HTML email templates before sending them in campaigns.
SEO Auditing
Inspect heading hierarchy, meta tags, and semantic structure for SEO health.
Frequently Asked Questions
Related Tools
HTML Rendering and Live Preview for Developers
HTML remains the foundation of every web page, email template, and embedded widget. Our HTML viewer lets you paste raw HTML and instantly see the rendered output alongside the formatted source code — invaluable for debugging layout issues, previewing email templates, testing CSS snippets, and prototyping UI components without spinning up a full development server. The viewer supports inline CSS, embedded styles, and renders HTML5 semantic elements faithfully.
Email Template Development
Email HTML is uniquely constrained — no external stylesheets, no JavaScript, limited CSS support, and wildly inconsistent rendering across email clients. Developers building transactional emails or marketing campaigns need to preview their HTML frequently during development. Our viewer provides an instant, zero-configuration preview environment. Paste your email HTML, verify the layout, and iterate quickly. For formatting structured data within templates, use the JSON Viewer to inspect template variables.
Quick Prototyping and Code Sharing
A browser-based HTML viewer is the fastest way to prototype a UI idea, test a CSS animation, or share a visual code example with a colleague. No build tools, no file system — just paste and see results. Write documentation with the Markdown Viewer or convert it to PDF with Markdown to PDF. Pick design colours with the Color Picker. Explore all tools on the homepage.