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CSS Class Name Obfuscator

Shorten CSS class names to single/double-character names to obfuscate your stylesheets. Paste your CSS and corresponding HTML, get a rename mapping table with before/after previews for both CSS and HTML, and copy the transformed code — all free and private, no signup required.

CSS Class Name Obfuscator

Paste your CSS and HTML below. All CSS class names will be shortened to the shortest possible single/double-character names. A rename mapping table shows every original name, its replacement, and total characters saved.

CSSCSS Input
HTMLHTML Input
Detected 13 unique class names·531 chars saved

Rename Mapping (13 classes)

Total saved: 531 chars
#OriginalShortOccurrencesChars Saved
1.btn.a11−22
2.btn-primary.b4−40
3.btn-secondary.c3−36
4.card.d13−39
5.card-body.e3−24
6.card-footer.f3−30
7.card-header.g3−30
8.footer.h9−45
9.footer-link.i4−40
10.header.j14−70
11.header-nav.k7−63
12.header-nav-item.l5−70
13.header-title.m2−22

CSSObfuscated CSS

.j { background: #1a1a2e; color: #fff; padding: 1rem; }
.m { font-size: 1.5rem; font-weight: 700; }
.k { display: flex; gap: 1rem; }
.l { cursor: pointer; padding: 0.5rem 1rem; border-radius: 4px; }
.l:hover { background: rgba(255,255,255,0.1); }
.d { border: 1px solid #e2e8f0; border-radius: 8px; padding: 1.5rem; margin: 1rem 0; }
.g { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.5rem; }
.e { line-height: 1.6; color: #475569; }
.f { border-top: 1px solid #e2e8f0; padding-top: 1rem; margin-top: 1rem; }
.a { display: inline-flex; align-items: center; padding: 0.5rem 1rem; border-radius: 6px; font-weight: 500; cursor: pointer; border: none; }
.b { background: #3b82f6; color: #fff; }
.b:hover { background: #2563eb; }
.c { background: #e2e8f0; color: #1e293b; }
.c:hover { background: #cbd5e1; }
.h { text-align: center; padding: 2rem; color: #94a3b8; font-size: 0.875rem; }
.i { color: #3b82f6; text-decoration: none; }
.i:hover { text-decoration: underline; }

HTMLObfuscated HTML

<div class="j">
  <div class="m">My App</div>
  <nav class="k">
    <span class="l">Home</span>
    <span class="l">About</span>
    <span class="l">Contact</span>
  </nav>
</div>

<div class="d">
  <div class="g">Welcome</div>
  <div class="e">
    This is a sample card component. The CSS classes on this page will be
    shortened to single or double-character names for obfuscation.
  </div>
  <div class="f">
    <button class="a b">Get Started</button>
    <button class="a c">Learn More</button>
  </div>
</div>

<div class="d">
  <div class="g">Features</div>
  <div class="e">CSS class name obfuscation helps protect your styling structure from casual inspection.</div>
  <div class="f">
    <button class="a b">View Details</button>
  </div>
</div>

<div class="h">
  <span>&copy; 2026 My App &mdash; </span>
  <a class="i" href="/privacy">Privacy</a>
  <a class="i" href="/terms">Terms</a>
</div>

Privacy Guarantee

All processing runs entirely in your browser. Your CSS, HTML, and the generated mappings never leave your device — no uploads, no API calls, no tracking.

Features

Dual Input (CSS + HTML)

Paste both your stylesheet and HTML markup. The tool cross-references both to ensure every class name used in HTML has a corresponding rename, and classes in CSS that aren't referenced are still shortened.

Shortest Possible Names

Class names are shortened to the smallest single-character names (a-z, A-Z, _), then double-character names (aa, ab, etc.), keeping your output as compact as possible.

Full Rename Mapping Table

A color-coded table shows every original class name, its short replacement, occurrence count, and total characters saved. Copy the mapping as JSON for your build pipeline.

Live Before/After Previews

See both the obfuscated CSS and obfuscated HTML update in real time as you edit the input. Copy transformed code for either output with one click.

Use Cases

Production CSS Minification

Shorten verbose BEM or utility class names like .header__nav-item--active into single-character names to reduce stylesheet and markup size, improving page load times.

Anti-Crawling Protection

Obfuscate semantic class names that reveal your page structure (e.g., .price, .admin-panel) to make it harder for scrapers and crawlers to extract meaningful data from your HTML.

React/Vue Component Privacy

When shipping client-side bundles with CSS-in-JS or scoped styles, obfuscate the generated class names so competitors can't reverse-engineer your component structure from the DOM.

CSS Module Output

Use this tool's rename mapping as a reference when configuring CSS Modules or PostCSS plugins, giving you full control over the final class name format in production builds.

WordPress Theme Distribution

When distributing premium themes, obfuscate class names to discourage casual copying while keeping the theme functional. The rename mapping helps maintain your development workflow.

A/B Testing & Experiment Pages

Obfuscate experiment page class names to prevent users or extensions from detecting and interfering with A/B test variations based on CSS class patterns.

About CSS Class Name Obfuscation

What Is CSS Class Name Obfuscation?

CSS class name obfuscation replaces descriptive, human-readable class names in your stylesheets and markup with short, meaningless names. For example, .header-nav-item might become .a, .card-body might become .b, and so on. The tool automatically generates the shortest possible names and applies the mapping consistently across both your CSS and HTML.

How Class Name Shortening Works

The tool extracts every unique class name from both your CSS selectors and your HTML class attributes. It then generates a rename mapping using the shortest available names — first single characters (a through z, A through Z, and underscore), then double characters (aa, ab, ..., _z), and so on. Each original name is replaced consistently across both files so your styles continue to apply correctly after obfuscation.

Size Reduction Benefits

Beyond obfuscation, class name shortening provides real bandwidth savings. A BEM-style class like .product-card__title--featured(31 characters) shrinking to .a (1 character) saves 30 characters per occurrence. With dozens of classes appearing hundreds of times across a large stylesheet, the cumulative savings can reach thousands of characters in both CSS and HTML payloads.

Limitations & Considerations

CSS class name obfuscation works best when you control both the stylesheet and the markup. If you use dynamic class names generated by JavaScript (e.g., string concatenation or template literals), the tool cannot track those references and they will be left as-is. Similarly, class names used in third-party libraries or inline in JavaScript files beyond the CSS/HTML inputs will not be renamed. The tool excludes CSS pseudo-classes (:hover), pseudo-elements (::before), and at-rules (@media) so those remain functional.

Frequently Asked Questions