HEX Color Codes: The Complete Developer's Reference Guide
Everything you need to know about HEX color codes. Learn 3-digit vs 6-digit hex, transparency with 8-digit hex, and common color values.
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Tags: color, css, developer-tools
HEX Color Codes: 3-Digit, 6-Digit, and 8-Digit (with Alpha) HEX color codes look like , , or . All three represent valid CSS colors, but they work differently and have different use cases. Understanding the structure of each format — and being able to parse one manually — is a useful skill for any frontend developer or designer. The Building Blocks: Hexadecimal Digits HEX (hexadecimal) is base-16 counting. Instead of 10 digits (0–9), it uses 16 symbols: where A=10, B=11, C=12, D=13, E=14, F=15. Two hex digits can represent 16 × 16 = 256 unique values (0–255). This maps perfectly to each RGB color channel, which also ranges from 0 to 255. 6-Digit HEX: The Standard Format The 6-digit HEX format is the most common color notation on the web: First two digits → Red channel Middle two digits →…
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