What is Hex Color?
A hex color (hexadecimal color code) is a six-digit code used to represent colors in web design and digital graphics. Learn how hex colors work and how to use them.
A hex color code is a six-digit hexadecimal number (base-16) prefixed with a hash symbol (#) that represents a color by specifying the intensity of Red, Green, and Blue (RGB) components. Each component is represented by two hexadecimal digits ranging from 00 (minimum) to FF (maximum).
How to Read a Hex Color Code
A hex color like #FF5733 is split into three pairs: • #FF — Red channel (255 in decimal = maximum red) • #57 — Green channel (87 in decimal) • #33 — Blue channel (51 in decimal) This gives an orange-red color. #FFFFFF is pure white (all channels at max), and #000000 is pure black (all channels at zero).
Hexadecimal Number System
Hexadecimal uses 16 digits: 0–9 and A–F. In hex: • 0 = 0 • 9 = 9 • A = 10 • F = 15 • FF = 255 This means each channel has 256 possible values (0–255), and a full hex color can represent 256³ = 16,777,216 unique colors — more than the human eye can distinguish.
Where are Hex Colors Used?
Hex colors are the standard in web development: • CSS: color: #FF5733; background-color: #1A2B3C; • HTML: <font color="#FF0000"> • Design tools: Figma, Photoshop, Illustrator all use hex codes • Brand guidelines: logos and UI elements often define colors with hex codes • SVG and canvas graphics
Try it yourself
Convert ColorsAbout Hex Color Codes
Hex color codes became the standard for web colors with the rise of HTML and CSS in the 1990s. They are compact, human-readable (once learned), and unambiguous. Modern CSS also supports shorthand 3-digit hex (#FFF for #FFFFFF) and 8-digit hex with alpha transparency (#FF573380 for 50% opacity).
FAQ
- What does the # symbol mean in a hex color?
- The # (hash/pound) symbol is simply a prefix indicating that the following characters are a hexadecimal color code. It is required in CSS but may be optional in some design tool input fields.
- What is the difference between hex color and RGB?
- They represent the same colors using different notations. Hex uses a 6-digit base-16 string (#FF5733), while RGB uses three decimal numbers separated by commas (rgb(255, 87, 51)). They are interchangeable and can be converted.
- What is an 8-digit hex color?
- An 8-digit hex color (#RRGGBBAA) includes an alpha channel for transparency. The last two digits (AA) represent opacity: FF is fully opaque and 00 is fully transparent.
Related Tools
Date Calculator
Calculate the difference between two dates in days, weeks, months, and years
Percentage Calculator
Calculate percentages, discounts, increases, and percentage differences
Image Compressor
Compress and resize images to reduce file size while maintaining quality
JSON Formatter
Format and beautify JSON data with syntax highlighting