Can I open multiple HTML files at once?

Yes. The HTML formatter supports true multi-tab editing where each file opens in its own tab with completely independent formatting state, undo history, and session persistence.

Is my HTML uploaded to a server?

No. All processing happens 100% in your browser. Your HTML never leaves your computer, making this tool completely private and secure for sensitive data.

Does it support large HTML files?

Yes. HTML formatting uses Prettier's robust parser running entirely in your browser. Large files are processed efficiently without server uploads.

What indentation styles are supported?

The formatter supports 2-space and 4-space indentation. Each tab can have its own indentation setting.

Does this tool support workspaces and folders?

Yes. You can organize your HTML files into folders, create multiple workspaces, and switch between them. All state persists across browser sessions using IndexedDB.

Can I use this tool offline after loading it once?

Yes. Once the page loads, the entire HTML formatter runs client-side via Prettier in your browser. There is no need for a persistent internet connection during use. All formatting, validation, and minification logic executes locally.

Does it support auto-correcting broken HTML?

Yes. The Auto Correct command reformats your HTML, automatically fixing some common issues like unclosed tags, misnested elements, and inconsistent indentation. Prettier's robust HTML parser handles recovery gracefully.

How does this tool compare to other HTML formatters?

LangStop's HTML formatter differentiates itself with true multi-tab support with independent state per tab, session persistence across browser refreshes, folder-based workspace organization, and a clean twin-editor (input/output) layout. Most alternatives either lack multi-tab support or share state across tabs.

Can I download the formatted HTML output?

Yes. You can download the formatted output as an .html file directly from the editor, or copy it to your clipboard. Both the input and output panels have download buttons.

Does the validator check for accessibility issues?

The HTML validator checks for syntax errors and parse compliance, but does not perform WCAG accessibility audits. For accessibility validation, use a dedicated tool like WAVE or axe DevTools alongside this formatter.

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HTML Formatter Online — Free Tool

Format, beautify, and minify HTML code instantly in your browser. Our HTML Formatter helps you clean up messy HTML with proper indentation and structure.

Why Use an HTML Formatter?

Readability: Properly indented HTML is easier to read and debug
Consistency: Maintain consistent formatting across your team's code
Debugging: Find missing closing tags and structural issues faster
Minification: Reduce HTML size for production deployments

Features

Multi-Tab Workspace: Open and manage multiple HTML files simultaneously with independent formatting state and session persistence
Format HTML: Beautify HTML with customizable indentation (2 or 4 spaces) powered by Prettier
Minify HTML: Remove unnecessary whitespace and comments to reduce file size
Validate HTML: Check your HTML for syntax errors and structural issues
Auto Correct: Automatically fix common HTML formatting issues
File Management: Upload .html files, organize into folders, and download formatted output
Session Persistence: Your work is automatically saved and restored when you return
Workspace Support: Create multiple workspaces for different projects
100% Client-Side: Your code never leaves your browser

How to Use

Paste your HTML code in the input editor or upload an .html file
Choose indentation (2 or 4 spaces) and click Format to beautify
Use Minify to compress for production or Validate to check syntax
Copy the formatted output or download it as an .html file
Your work is automatically saved — come back anytime

Privacy & Security

All HTML processing happens entirely in your browser using JavaScript. Your code and data are never uploaded to any server, making this tool safe for processing proprietary or sensitive HTML content.

Features

Multi-Tab Workspace: Open and manage multiple HTML files simultaneously with independent formatting state and session persistence

Format HTML: Beautify HTML with customizable indentation (2 or 4 spaces) powered by Prettier

Minify HTML: Remove unnecessary whitespace and comments to reduce file size

Validate HTML: Check your HTML for syntax errors and structural issues

Auto Correct: Automatically fix common HTML formatting issues

File Management: Upload .html files, organize into folders, and download formatted output

Session Persistence: Your work is automatically saved and restored when you return

Workspace Support: Create multiple workspaces for different projects

100% Client-Side: Your code never leaves your browser

How to Use

Paste your HTML code in the input editor or upload an .html file

Choose indentation (2 or 4 spaces) and click Format to beautify

Use Minify to compress for production or Validate to check syntax

Copy the formatted output or download it as an .html file

Your work is automatically saved — come back anytime