ConverterHub

Web-Safe Color Snapper

Enter a hex color to snap it to the nearest web-safe color.

How it is calculated

The tool reads a six-digit hex colour (the leading # is optional, upper or lower case) and splits it into red, green and blue values from 0 to 255. Each channel is snapped on its own: snapped = round(value ÷ 51) × 51, which gives one of 0, 51, 102, 153, 204 or 255. The three snapped values are written back as an uppercase hex code and as rgb(r, g, b). The third result says whether your colour was already web-safe, meaning no channel changed. Channels switch at the midpoints: 25 rounds down to 0 but 26 rounds up to 51. Shorthand like #abc, codes with an alpha pair (8 digits) and invalid characters are rejected and give no result.

Worked example

Start with #1E6BFF. In decimal the channels are red 30, green 107, blue 255. Red: 30 ÷ 51 = 0.59, rounds to 1, so 1 × 51 = 51. Green: 107 ÷ 51 = 2.10, rounds to 2, so 2 × 51 = 102. Blue: 255 ÷ 51 = 5, already exact, so 255. In hex 51, 102, 255 is 33, 66, FF. The tool gives #3366FF, shown as rgb(51, 102, 255), and answers No to whether the colour was already web-safe.

Try this example →

Common mistakes

  • Typing a three-digit shorthand such as #36F. The tool needs all six digits, so expand it to #3366FF first.
  • Pasting an 8-digit hex with transparency (for example #1E6BFF80). The alpha pair makes the input invalid, so remove it before snapping.
  • Expecting the snapped colour to look very close. Each channel can move by up to 25 steps, so a dark grey like #191919 becomes pure black #000000.
  • Confusing the six web-safe values with percentages. They are 0, 51, 102, 153, 204 and 255 out of 255, which is 0%, 20%, 40%, 60%, 80% and 100% of the range.
  • Assuming a colour near a midpoint rounds the way it looks. #1A1A1A (26) goes up to #333333, while #191919 (25) goes down to #000000.

About this calculator

The 216-color web-safe palette dates back to the era of 256-color displays: it restricts each RGB channel to just six values — 0, 51, 102, 153, 204 and 255 — spaced evenly so that every combination renders identically across old 8-bit graphics cards and operating systems without dithering or color shifts.

This tool rounds each channel of any hex color to the nearest of those six values and returns the resulting web-safe hex code. While modern displays render millions of colors reliably, the palette is still referenced by designers working on retro or pixel-art aesthetics, in email and legacy system design where rendering consistency across old clients matters, and in design education explaining how color constraints shaped early web development.

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