InDesign includes a color swatch library called Web, which consists of the colors most web browsers use to display text and graphics in web pages. The 216 colors in the library, often called web-safe colors, are consistent across platforms, because they are a subset of the colors that browsers use in both Windows and Mac OS. The web-safe colors in InDesign are the same as those in the Adobe Photoshop web-safe color palette and the Adobe Illustrator browser-safe color palette.

Each color in the library is named by its RGB values. Each color’s hexadecimal code, which HTML uses to define the color, is stored within the color swatch.