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Improve readability of HTML snippets by inserting line breaks between tags. Best for logs, templates, and quick reviews; it does not validate full documents or auto-close tags.
Quick answer: HTML Formatter
Splits adjacent HTML tags onto new lines for quick readability checks.
Example: `<nav><a href='/'>Home</a></nav>` becomes readable multi-line markup you can diff in PRs.
Calculations follow the documented formula on this page; rounding and input units can change the last digit-treat outputs as educational estimates unless you reconcile with source systems.
* This is an estimate. Actual amounts may vary slightly based on input assumptions.
This formatter never claims to validate HTML5; it is a whitespace helper for logs, snippets, and Slack pastes. Pair it with your IDE formatter when you need balanced-tree fixes.
Improve readability of HTML snippets by inserting line breaks between tags. Best for logs, templates, and quick reviews; it does not validate full documents or auto-close tags.
Inputs on this page: HTML. Assumptions stay visible so you can reproduce the figure elsewhere.
Long-form walkthroughs that pair well with this calculator. When you need narrative context beyond the live fields, start here and return to the tool to plug in your own numbers.
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Read guide →People who care about html formatter online use HTML Formatter as a planning sandbox: Sanitize user HTML before rendering on public pages - formatting does not remove XSS.
Continue in the Developer category hub, the Developer tools collection, or the glossary. Related calculators in this session: JSON Formatter, API Response Formatter, Markdown to HTML (Core Syntax), CSS Minifier, XML Formatter, JSON Validator.
The Formula
Readable pass: split adjacent tags onto new lines without semantic rewriting| This tool | Readable pass: split adjacent tags onto new lines without semantic rewriting |
|---|---|
| Related intent: html formatter online | See paired tools for html formatter online-each page documents its own core relationship next to the live form. |
| Related intent: pretty print html | See paired tools for pretty print html-each page documents its own core relationship next to the live form. |
Core relationship for HTML Formatter:
Readable pass: split adjacent tags onto new lines without semantic rewriting
Worked check: `<nav><a href='/'>Home</a></nav>` becomes readable multi-line markup you can diff in PRs.
Keep the same assumptions and open a neighbor calculator when your question branches: JSON Formatter, API Response Formatter, Markdown to HTML (Core Syntax), CSS Minifier. Each page documents its own formula beside the fields.
Learning links: Methodology · Editorial policy · Glossary
`<nav><a href='/'>Home</a></nav>` becomes readable multi-line markup you can diff in PRs.
Re-enter the same numbers in the calculator above to confirm the page math matches the interactive result.
People who care about html formatter online use HTML Formatter as a planning sandbox: Sanitize user HTML before rendering on public pages - formatting does not remove XSS.
Instant response
Run HTML Formatter in the browser and read the breakdown beside the form.
Transparent formula
The formula and worked example on this page match what the calculator uses.
Privacy friendly
No account required; inputs stay in your session unless you choose to share them.
Cross-device ready
Layout works on mobile, tablet, and desktop for the same field labels.
Official references for context. Calculator outputs are planning estimates—confirm material decisions with the primary authority or a qualified professional. See our methodology and editorial policy.
Reviewed July 18, 2026 · Content stamp 2026-07-18
Click a question to expand the answer.
No; it is a whitespace/readability helper only.
Very long single-line nodes stay long; split carefully in an editor if needed.
No; processing stays in your browser session.
JSX often needs a dedicated formatter; results here are best-effort.
Strip dangerous tags per your CMS policy first.
Splits adjacent HTML tags onto new lines for quick readability checks.
`<nav><a href='/'>Home</a></nav>` becomes readable multi-line markup you can diff in PRs.
Sanitize user HTML before rendering on public pages - formatting does not remove XSS. Large inline SVG may stay wide; break manually if reviewers need smaller diffs.
Same-category picks first, then high-intent neighbors that often answer the next calculation question.
JSON Formatter
Format minified JSON beautifully.
JSON Validator
Validate JSON syntax instantly with error feedback.
Base64 Encoder/Decoder
Encode or decode Base64 text for APIs and integrations.
URL Encoder/Decoder
Encode or decode URL strings for query and path safety.
Regex Tester
Test regex patterns and preview matched outputs.
API Response Formatter
Format and validate API JSON responses for readability.
Open the full directory, browse your hub collection, or jump back to this category. Bookmark the page if you use it often.
Reviewed by Imtiaz Ahmad
Founder & lead engineer | Last reviewed July 18, 2026
See methodology and editorial policy.