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Color Expander

Expand 3-digit HEX codes to 6-digit codes (e.g., #FFF to #FFFFFF)

Show colors that are already 6 digits with reasons

Key Facts

Category
Design
Input Types
textarea, select, checkbox
Output Type
text
Sample Coverage
4
API Ready
Yes

Overview

The Color Expander is a specialized utility designed to instantly convert shorthand 3-digit HEX color codes into their standard 6-digit counterparts, ensuring consistency across your CSS and design projects.

When to Use

  • •When you need to standardize a mix of 3-digit and 6-digit HEX codes in your CSS files.
  • •When preparing color palettes for web development that require full 6-digit hexadecimal notation.
  • •When cleaning up legacy codebases that use shorthand color definitions.

How It Works

  • •Paste your list of HEX color codes into the input area, with one color per line.
  • •Select your preferred output format, such as uppercase, lowercase, or CSS-ready syntax.
  • •Toggle the inclusion of already 6-digit colors if you wish to process your entire list at once.
  • •Click the convert button to generate your standardized list of 6-digit HEX codes.

Use Cases

Standardizing design tokens for a cross-platform UI library.
Refactoring CSS stylesheets to meet strict coding style guidelines.
Converting legacy shorthand color values for modern web applications.

Examples

1. Standardizing CSS Variables

Frontend Developer
Background
A project contains a mix of shorthand and full HEX codes in a global CSS variables file, causing inconsistencies.
Problem
Need to convert all shorthand codes to 6-digit format to maintain a uniform codebase.
How to Use
Paste the list of variables into the tool and select 'CSS format'.
Example Config
Format: CSS format, Include already 6-digit colors: Checked
Outcome
All colors are converted to a consistent 6-digit format, ready to be pasted back into the CSS file.

2. Cleaning Design System Assets

UI Designer
Background
Exported color palettes from a design tool often include a mix of 3-digit and 6-digit HEX values.
Problem
The development team requires all colors to be in 6-digit uppercase format for documentation.
How to Use
Input the raw color list and select 'uppercase' output.
Example Config
Format: uppercase, Include already 6-digit colors: Checked
Outcome
A clean, standardized list of 6-digit HEX codes that matches the design system documentation.

Try with Samples

design
Color Code Samples
Collection of color codes in various formats (Hex, RGB, HSL, named colors) for validation testing
title token color
sample
SVG Samples
Scalable Vector Graphics (SVG) samples demonstrating various SVG features and techniques
keywords web
sample
Hex/Unicode Encoding Format Samples
Examples of hex (\xXX) and unicode (\uXXXX) escape sequence encoding formats
task convert
sample
JWT Samples
Comprehensive JWT examples from basic token structure to advanced security implementations
keywords web
sample

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FAQ

Does this tool support colors without the hash symbol?

Yes, the tool accepts both formats and will normalize them based on your chosen output settings.

Can I process multiple colors at once?

Yes, simply paste your list of colors into the input field with each code on a new line.

What happens to colors that are already 6 digits long?

You can choose to include them in the output or filter them out using the 'Include already 6-digit colors' checkbox.

Is the output compatible with CSS?

Yes, you can select the 'CSS format' option to ensure the output is ready for direct use in your stylesheets.

Does this tool change the actual color values?

No, it only expands the shorthand notation (e.g., #F00) to the full notation (#FF0000), keeping the color identical.

API Documentation

Request Endpoint

POST /en/api/tools/color-expander

Request Parameters

Parameter Name Type Required Description
colors textarea Yes -
format select Yes -
includeAlreadyExpanded checkbox No Show colors that are already 6 digits with reasons

Response Format

{
  "result": "Processed text content",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}
Text: Text

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-color-expander": {
      "name": "color-expander",
      "description": "Expand 3-digit HEX codes to 6-digit codes (e.g., #FFF to #FFFFFF)",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=color-expander",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

If you encounter any issues, please contact us at [email protected]