What is the Alpha channel (transparency)?

The alpha channel represents a color's transparency/opacity, ranging from 0-255 or 0%-100%. 0 = fully transparent, 255 (FF) = fully opaque. In HEX: #RRGGBBAA (e.g., #FF573380 = 50% opacity). RGBA: rgba(255,87,51,0.5). HSLA: hsla(12,100%,60%,0.5). Use the alpha slider in this tool to adjust transparency.

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📖 Frequently Asked Questions

What's the difference between HEX, RGB, and HSL color formats?

HEX uses #RRGGBB notation like #FF5733 — the most common format in web development. RGB uses three 0-255 values. HSL uses hue angle (0-360°), saturation and lightness percentages — more intuitive for humans. This tool supports real-time conversion between all three formats.

How do I use hex colors in HTML/CSS?

In CSS: color: #FF5733; background-color: #3498db;. You can use 3-digit shorthand (#fff), 6-digit standard (#ff5733), or 8-digit with alpha (#ff573380 = 50% opacity). All formats generated by this tool are ready for CSS/HTML.

What is the Alpha channel?

The alpha channel represents transparency/opacity (0-255 or 0%-100%). 0 = fully transparent, 255 (FF) = fully opaque. HEX: #RRGGBBAA (e.g., #FF573380). RGBA: rgba(255,87,51,0.5). HSLA: hsla(12,100%,60%,0.5).

How do I find complementary colors?

Complementary colors are opposite on the color wheel (180° apart). Using HSL mode, adjust hue by 180°. For example, #3498db (hue 204°) complements with #db7734 (hue 24°).

How many possible hex color codes are there?

Standard 6-digit hex: 256³ = 16,777,216 possibilities. With alpha (8-digit): 256⁴ = 4,294,967,296 possibilities. This tool lets you browse all of them.

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