CSS Minifier

Compress CSS into compact stylesheets without reordering rules.

Input
Output
0 characters 0 lines

What does CSS Minifier do?

CSS Minifier removes unnecessary whitespace and comments from CSS to produce compact stylesheets.

  • Primary use: CSS Minifier removes unnecessary whitespace and comments from CSS to produce compact stylesheets.
  • Key technical fact: CSS minification can shorten colors and spacing, but must preserve cascade, selector, and declaration behavior.
  • Practical check: Run the formatted or minified output through your parser, tests, or runtime when exact syntax behavior matters.
Topic Direct answer Source
Direct answer CSS Minifier removes unnecessary whitespace and comments from CSS to produce compact stylesheets. CSS Color Module Level 4
Key fact CSS minification can shorten colors and spacing, but must preserve cascade, selector, and declaration behavior. CSS Color Module Level 4
Processing model Runs locally in the browser; no production Node server receives the input. Browser JavaScript

Shrink CSS while preserving the cascade

CSS Minifier removes avoidable whitespace, comments, and formatting so stylesheets take less space. It is useful for quick snippets, embedded styles, examples, and static assets that do not need a full build pipeline.

CSS minification must preserve selector order, declaration order, specificity, cascade layers, custom properties, and at-rule structure. Reordering or merging rules can change computed styles, so this tool focuses on compact text rather than risky optimization.

How to use

  1. Paste your CSS code into the input editor.
  2. Click Minify CSS to remove avoidable formatting and comments.
  3. Review the output to confirm rule order, at-rules, and custom properties are preserved.
  4. Use Copy for the clipboard, Download for a file, or Clear to reset.

What is CSS Minifier?

CSS Minifier is a browser-based utility for turning readable CSS into a smaller stylesheet. It keeps the same rules and declarations while removing formatting characters that browsers do not need.

Some comments are meaningful, such as license banners or build-tool annotations. Keep a readable source file and verify minified CSS visually in the pages that use it.

Input notes

Paste CSS only. If your project needs autoprefixing, source maps, unused CSS removal, or advanced merging, run the output through your normal build and browser test process.

Example

A short stylesheet is compacted by removing the comment and formatting whitespace:

--- Formatted Input ---
/* Main styles */
body {
  margin: 0;
  padding: 0;
}

--- Minified Output ---
body{margin:0;padding:0;}

MCP integration

MCP (Model Context Protocol) lets AI agents and apps discover and run Coding.Tools utilities for repeatable conversions, formatting, hashing, and generation workflows.

MCP tool name: css-minifier

MCP endpoint: https://coding.tools/mcp

Call tools/list first. Each tool entry includes inputSchema, outputSchema, and examples so an AI agent or client can build valid arguments without guessing.

For tools/call, read result.content[0].text for the display value and result.structuredContent for machine parsing. Tool-level failures return isError: true; protocol failures return a JSON-RPC error.

Example tools/call request:

curl -s https://coding.tools/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "MCP-Protocol-Version: 2025-06-18" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"css-minifier","arguments":{"input":".button {\n  color: white;\n  background: #3366cc;\n  padding: 8px 12px;\n}"}}}'

Most text and data tools accept an input string plus optional options. Browser-only image tools are listed for discovery and return a web UI link when they need browser image APIs.