HTML Formatter
Use this free HTML Formatter to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
Format and beautify HTML instantly in your browser. Free online HTML formatter with configurable indentation — no data uploaded.
Calculator Inputs
About HTML Formatter
Use this free HTML Formatter to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
This HTML formatter tokenizes markup into comments tags and text, then re-prints with indentation mirroring nesting depth. Paste div p Hello span World minified to get four lines with two-space steps. Void elements like br img meta link input never indent as containers. Text inside tags preserved exactly with attributes untouched. Formatting runs locally with no uploads for proprietary templates.
How nesting math works for USA teams - Depth starts zero, increments after opening non-void tags, decrements before closing tags, clamps at zero for stray closes. Comments print at current depth without affecting stack. Whitespace-only tokens skipped to collapse minified gaps. Result trims trailing newline and reports line counts for diffs across GitHub PRs from Dallas to San Francisco.
Email and CMS uses - Outlook conditional comments preserved as comment tokens for MSO tables. Landing builders export single-line HTML that hides missing closes, which formatter exposes via indent drift. Scraped pages reveal nested div soup before cleanup. WordPress oEmbeds align for readability before pasting into templates. Validate after formatting with tag checker for unclosed p inside div.
Indent choices - Two spaces suits modern JS and Prettier defaults in USA startups. Four spaces matches Python-flavored shops and legacy Java teams. Tab keeps files small for large exports but renders wide in Slack. Pick one per repo and enforce via editorconfig to avoid mixed diffs. Copy output directly into VS Code with format-on-save off to keep style.
Privacy and reliability - No network means HIPAA-friendly markup reviews stay on device. Deterministic output means same input same indent across Chrome Safari Firefox. Large files of thousands of lines format in milliseconds limited by textarea memory. No tag renaming occurs, so SEO attributes and data hooks survive intact.
Limits and pairings - Whitespace-only changes, no attribute sorting or quote fixes. Inline span on own line is valid standard style, not semantic change. For tag balance errors, run HTML validator after formatting. For XML feeds, use XML formatter with stricter prolog rules for USA sitemaps.
Where it is used
Austin developers reviewing minified React builds for Texas startups, Chicago marketers fixing Mailchimp templates for Illinois campaigns, Miami agencies cleaning scraped landing pages for Florida clients, Denver bloggers formatting WordPress embeds for Colorado posts, Seattle QA inspecting CMS output for Washington sites, and New York students learning nesting for Manhattan bootcamp homework every week.
How to use the HTML Formatter
- HTML to format — enter the value (e.g. <div><p>Hello</p><span>World</span></div>).
- Indentation — enter the value.
- Calculate — press the Calculate button to see the result instantly above.
Formula
tokenize comments/tags/text via regex → stack depth → void set br/img/meta no indent → reprint indent repeat depth per line.
Examples
Div nest
4-space email
Tab minified
Frequently Asked Questions
- Change markup?
- No. Only whitespace line breaks change. Tags attributes text preserved exactly.
- Inline span?
- Yes kept correct. Own line is standard format style, still valid.
- Void tags?
- br img meta link never indent as containers. Correct by spec.
- Comments?
- Preserved at depth. Outlook MSO conditionals stay intact.
- Large files?
- Thousands of lines fine. Limited by textarea memory only.
- Private?
- Yes. All markup stays local with no uploads.