HTML Formatter, Minifier & Beautifier
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HTML formatter: beautify and minify markup in the browser
An HTML formatter re-indents tags and attributes so you can read templates, email fragments, or scraped markup without horizontal scrolling. Minify mode strips non-essential whitespace between tags when you need a smaller payload for inline snippets or quick tests.
This is a layout tool, not a validator: it does not fetch external resources, execute scripts, or guarantee WHATWG-perfect parsing. Paste your markup, review the structure, then copy the result back into your CMS, test harness, or design handoff.
How to use this converter
- Paste HTML—full documents, partial components, or SVG fragments.
- Pick spaces or tabs and an indent width, then click Format.
- Use Minify for a compact one-line version when size matters more than readability.
- Copy or download; verify attribute values and text nodes if whitespace inside tags is significant.
Before and after examples
| Original | Converted | Notes |
|---|---|---|
| <div><p>Hi</p><ul><li>One</li></ul></div> | Indented nested block | List inside paragraph wrapper |
| <img src="x" alt="Logo"> | Same attributes, clearer line breaks | Void element |
What changes when you format HTML
The formatter inserts line breaks between sibling tags and indents nested elements so `<div><p>` hierarchies are obvious. Inline text nodes may stay on the same line as their parent depending on how the input was written. Attribute order and quoting style are preserved; only whitespace around tags is adjusted.
Void elements (`<img>`, `<br>`, `<input>`) and custom components follow the same indentation rules. SVG and MathML namespaces format like HTML for review purposes, though specialized validators are still recommended before production SVG.
When beautifying helps—and when minify does
Beautify when reviewing templates from a CMS export, comparing two versions in a diff tool, or teaching students how nesting works. Minify when embedding a small HTML fragment in a JSON field, shrinking an email snippet, or preparing a quick paste into a constrained textarea—not for serving full pages without a proper build pipeline.
If you need semantic cleanup (removing empty paragraphs, fixing unclosed tags), start with formatting to see structure, then fix issues manually or with a linter in your IDE.
Email HTML, tables, and legacy layouts
Newsletter HTML often relies on nested tables for Outlook compatibility. Formatting makes those tables easier to audit for missing `role` attributes or duplicate IDs before send. Legacy sites may include inline styles on every element—formatting does not strip styles, it only changes line breaks.
For accessibility, formatted markup is easier to scan for heading order and landmark roles, but automated checks (axe, Lighthouse) still belong in your QA flow.
Pair with CSS and JavaScript formatters
A typical component review formats HTML, then the linked `<style>` block in the CSS formatter and any `<script>` in the JavaScript formatter. URL encoding is separate—do not confuse minified HTML with encoded entities for query strings.
Frequently asked questions
Does HTML Formatter fix invalid markup?
It improves readability but does not insert missing closing tags or repair broken attributes. Use a validator for strict checks.
Will minify break my inline scripts?
Minify removes whitespace between tags. Whitespace inside `<pre>` or significant text nodes should be reviewed manually after minifying.
Can I format HTML email templates?
Yes. Paste the template, format to audit table nesting and alt text, then copy back to your ESP editor.
Is content uploaded?
Formatting runs locally in your browser.