input.html

<!doctype html><html><head><title>Demo</title><style>body{font-family:sans-serif;margin:2rem}h1{color:#2d6cdf}</style></head><body><h1>Hello, world</h1><p>This HTML is <strong>rendered</strong> locally — nothing is uploaded.</p><ul><li>One</li><li>Two</li></ul></body></html>

output.htmlIndent

Paste HTML to pretty-print it with consistent indentation.

Guides for HTML Formatter

All guides →

Guide

JSON Parse Errors: Read the Message, Jump to the Fix

A directory of JSON parser error messages and the article that explains each one — start with a strict validator, then drill into the specific syntax problem.

Guide

Fix Invalid JSON: From 'What's Wrong' to a Clean File

Repair JSON that looks almost right — trailing commas, single quotes, unquoted keys — using a smart formatter that tolerates almost-JSON and then validates strictly.

Guide

JSON Formatter, Validator, Viewer: Pick the Right Tool

Compare formatter, validator, viewer, minifier, and diff side by side, with the order to chain them when you're reviewing an API payload.

Online HTML Formatter & Beautifier

Paste minified or messy HTML and click Format to beautify it with consistent, readable indentation. This online HTML formatter runs entirely in your browser — nothing is uploaded — so it is safe for internal templates and production markup.

Beautify HTML — turn one-line or inconsistent markup into a clean, indented tree
Choose indent width — 2 or 4 spaces
Preserve content — text, <script>, <style>, and <pre> blocks are kept intact
Private — an HTML beautifier that works locally, with no upload

Format HTML, the safe way

The formatter re-indents tags by nesting depth without rewriting your content. Void elements like <br>, <img>, and <input> are handled correctly, and the contents of <script>, <style>, <pre>, and <textarea> are left exactly as they are so nothing breaks.

To see the markup rendered as you format it, use the HTML Viewer. To pretty-print structured data instead, try the XML Formatter or JSON to XML.

FAQ

How do I format HTML online?

Paste your HTML, choose an indent width, and click Format. The beautifier re-indents the markup by nesting depth and you can copy the result — all in your browser.

Does it change my content?

No. It only adjusts whitespace and indentation between tags. Text and the contents of <script>, <style>, and <pre> are preserved.

Is the HTML uploaded to a server?

No — formatting happens locally in your browser, so it is safe for confidential or internal markup.