HTML Formatter

An HTML formatter, or beautifier, indents markup so each block element sits on its own line and nesting is easy to follow. This free tool formats HTML as you type with 2-space, 4-space or tab indentation, keeps short inline content on one line, preserves pre and textarea content exactly, and warns about unclosed or mismatched tags. It can also minify HTML.

Free, no signup. Runs entirely in your browser; files and text are not uploaded.

How to use the HTML Formatter

  1. Paste HTML into the HTML input box, open an .html file, or click Load sample.
  2. Choose Beautify or Minify.
  3. Select an indent of 2 spaces, 4 spaces or Tab.
  4. Fix any unclosed or mismatched tags listed under Markup problems found.
  5. Copy or download the result.

Features

  • Indents nested elements and keeps short inline content on one line
  • Preserves pre and textarea content and re-indents script and style blocks
  • Handles void elements, self-closing tags, comments and the doctype
  • Warns about unclosed, mismatched and stray closing tags with line numbers
  • Minifies HTML without removing spaces between inline elements
  • Open .html files, copy and download

Frequently asked questions

Will formatting change how my page looks?

Block layout is unaffected. Whitespace between inline elements can matter, so the formatter keeps short inline runs such as <p>Hello <b>world</b></p> on one line and never changes pre or textarea content.

Does it fix broken HTML?

It does not rewrite your markup, but it lists unclosed, mismatched and stray closing tags with line numbers so you can fix them. Elements whose end tags are optional, such as li and p, are not reported.

Is my HTML rendered or executed?

No. The formatter only processes the code as text, so scripts in your HTML never run, and nothing is uploaded.

What does minifying HTML remove?

Comments (except conditional comments) and unnecessary whitespace between tags. Content inside pre and textarea is left untouched.

Related tools

  • CSS Formatter – Beautify or minify CSS with safe handling of selectors, strings and url() values
  • Markdown Preview – Live GitHub-style Markdown preview with sanitised HTML export and .md files
  • JSON Formatter – Beautify, minify and validate JSON with error line numbers, key sorting and auto-fix
  • URL Encoder – Percent-encode or decode URLs and query strings, with form (+) and component modes

Built and reviewed by Naqash Thaheem, Technical Project Manager. Last reviewed 2026-09-24.