OneFreePlace · Developer Tools · #345

HTML Formatter

Beautify HTML without casually breaking inline text, protected blocks, template syntax or attributes. Format locally with a structural guard, diagnostics, batch ZIP and a sanitized preview.

100% freeLocal processingNo uploadStructural guard
HTML input0 lines · 0 B
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Formatted outputWaiting
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Ready to formatInput never leaves this device.
Structural guard—
Idempotency—
Notices—
Time—
Safe design: attributes stay in their original order and values are never rewritten. pre, textarea, script, style and optionally code bodies are protected byte-for-byte. Inline text is not word-wrapped.
Elements—
Attributes—
Max depth—
Protected blocks—
Comments—
Templates—
Output lines—
Output size—

Structure & safety audit

The formatter re-tokenizes the output and verifies protected tags, attribute payloads, comments, templates, raw regions and non-whitespace text.

Format HTML to see structural notices and verification results.

Sanitized preview

Scripts, remote-resource URLs, inline event handlers and style payloads are removed before rendering. This preview is for layout inspection, not pixel-identity testing.

Input
Formatted
Drop HTML files hereChoose multiple .html/.htm/.xhtml/.txt files. Formatting, verification and ZIP creation stay local.

Portable formatter profile

Share formatting rules without sharing HTML. The profile is plain JSON.

Why this formatter is conservative

Whitespace sensitivityCSS-aware mode breaks known block boundaries while protecting inline text flow; Strict mode is available for fragile templates.
Protected regionsraw text and whitespace-sensitive blocks are never run through a generic formatter.
Opaque attributesattribute order, quote characters and values survive; only inter-attribute layout changes.
Fail closedcopy/download stay disabled if the protected structural fingerprint changes.

Full documents or fragments

Use a complete page, email template, CMS fragment, component snippet or table. HTML5 void elements and common optional-end-tag patterns are understood.

Inline-text protection

<p>Hello <strong>world</strong>!</p> keeps its text and inline spacing instead of putting every tag on a new line.

Whitespace-sensitive regions

pre, textarea, script, style and optionally code bodies are kept byte-for-byte.

Template-friendly

Handlebars/Mustache {{…}}, Jinja/Twig/Liquid {% … %}, template comments, PHP processing blocks and ASP-style <% … %> are preserved as opaque regions.

Attributes without surprises

Smart wrapping can place long attributes on separate lines without reordering attributes or normalizing values.

Diagnostics, not repair

Stray closers, unclosed non-optional elements and implicit closes are reported. The formatter does not silently invent missing application markup.

Sanitized local preview

Compare input and output in sandboxed frames after scripts, remote resource URLs, event handlers and style payloads are removed.

Privacy

No account, upload, telemetry or server round trip is required. File decoding, formatting, audit and batch ZIP creation stay in your browser.