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PHP
Validate Hex Color
Accept #RGB, #RGBA, #RRGGBB, or #RRGGBBAA hex colors (with or without the leading #). Returns the normalized 6/8-digit lowercase form.
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PHP
RGB ↔ Hex Conversion
Two-way conversion between #RRGGBB hex strings and [R, G, B] arrays. Handy when working with theme colors that come from both sources (CSS strings vs. RGB sliders).
JavaScript
Hex ↔ RGB Conversion
Converts between hex colour strings (#rrggbb / #rgb) and RGB component objects. hexToRgb parses both shorthand and full hex formats. rgbToHex converts R, G, B integers (0–255) back to a hex string. Handy for colour manipulation, generating CSS variables, and passing colour data between libraries.
Bash
ANSI Color Output Helpers
Wrap printf with ANSI escape codes for color and bold. Auto-disable if stdout isn't a TTY (so piping to a file doesn't pollute it with escape sequences).
JavaScript
Random Hex Color
Generates a random 6-digit hex colour string. Useful for seeding avatar backgrounds, chart series colours, placeholder UI elements, and testing colour-dependent components. The crypto version produces a more unpredictable result suitable for generating unique palette tokens.