ANSI Color Code Generator: Build Terminal Escape Sequences Visually

Stop memorizing ANSI escape sequences. I built a browser tool to generate them visually — pick colors, styles, and get the code ready to paste.

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🔗 ANSI Color Code Generator — DevNestio

Features

• 3 color modes: 8-color, 256-color palette, RGB truecolor (24-bit)
• 8 text styles: Bold, Dim, Italic, Underline, Blink, Reverse, Hidden, Strikethrough
• Separate FG/BG: Set foreground and background colors independently
• 3 output formats: Shell (echo -e), Python (print), Raw escape sequence
• Live preview in a simulated terminal box

How ANSI sequences work

ESC [ <codes> m

Multiple codes are separated by ;. Reset is ESC[0m.

8-color: codes 30-37 (FG), 40-47 (BG), 90-97 (bright FG)

256-color: ESC[38;5;<0-255>m for FG, ESC[48;5;<0-255>m for BG

RGB truecolor: ESC[38;2;<R>;<G>;<B>m

256-color palette calculation

function get256Color(i) {
  if (i < 16) return standardColors[i].hex;
  if (i < 232) {
    const n = i - 16;
    const r = Math.floor(n / 36) * 51;  // 255/5 = 51
    const g = Math.floor((n % 36) / 6) * 51;
    const b = (n % 6) * 51;
    return `rgb(${r},${g},${b})`;
  }
  const v = (i - 232) * 10 + 8; // 24 grayscale steps
  return `rgb(${v},${v},${v})`;
}

Output examples

# Bold red text on black
echo -e "\e[1;31mHello, Terminal!\e[0m"

# RGB orange (Python)
print("\033[38;2;255;128;0mOrange text\033[0m")

Tested with 128 assertions covering code generation, color math, and format strings.

Part of DevNestio — 115 free browser-only developer tools.