RGB to Hex Converter

About the RGB to Hex Converter

The RGB to Hex Converter takes decimal red, green, and blue values (0–255) and converts them to a hexadecimal color code (#RRGGBB) for use in CSS, HTML, and design tools. Enter your RGB values and review the hex code with a live color preview.

RGB values are the natural way to describe colors in programming — they map directly to the three light channels your screen uses. However, CSS shorthand and design tools often prefer hex notation for its brevity. Converting rgb(52, 152, 219) to #3498DB by hand requires converting each decimal value to a two-digit hex number.

This converter handles the math and validates that your values are in the valid range (0–255). It also shows the CSS rgb() format for copy-pasting into stylesheets.

When This Page Helps

Design tools often output RGB values, but CSS, brand guides, and style systems typically use hex codes. This converter bridges that gap with a live preview and matching hex value.

How to Use the Inputs

1. Enter the red value (0–255).
2. Enter the green value (0–255).
3. Enter the blue value (0–255).
4. View the hexadecimal color code below.
5. Check the color preview swatch to verify visually.
6. Copy the hex code for your project.

Example Calculation

Tips & Best Practices

• Remember that each hex pair represents one byte (0–255): 00 = 0, 7F = 127, FF = 255.
• Values outside 0–255 are invalid — RGB channels are always unsigned 8-bit integers.
• If you get a single-digit hex result (like "A"), pad it with a leading zero ("0A").
• The hex output is case-insensitive in CSS: #2ecc71 and #2ECC71 are identical.
• For transparency, add a 4th value (alpha): rgba(46, 204, 113, 0.8) or #2ECC71CC.

The RGB to Hex Conversion

Converting RGB to hex is a simple base conversion repeated three times. Each RGB channel (0–255 in decimal) becomes a two-character hexadecimal string (00–FF). The three pairs are concatenated with a # prefix to form the standard CSS hex color notation.

When to Use Hex vs. RGB

Hex is preferred for static, known colors in CSS and style guides due to brevity. RGB (and rgba for transparency) is preferred for dynamic colors computed in JavaScript, where channel manipulation is needed. Both produce identical results in browsers.

Color Accuracy Across Devices

The hex or RGB code defines a color in the sRGB color space. How that color appears on screen depends on the display's color gamut, brightness, and calibration. For critical color work (branding, print production), use color-managed workflows with calibrated monitors.

Frequently Asked Questions

• How do I convert RGB to hex manually?

  Convert each decimal value (0–255) to hexadecimal (00–FF). For R=46: 46 ÷ 16 = 2 remainder 14. 2 = "2", 14 = "E", so 46 = "2E". Concatenate R+G+B hex pairs with a # prefix.

• What RGB values make white?

  White is RGB(255, 255, 255) = #FFFFFF. Black is RGB(0, 0, 0) = #000000. All channels at maximum produces white light; all at zero produces black.

• Can RGB values be negative or above 255?

  No. Each RGB channel is an 8-bit unsigned integer, limited to 0–255. Values outside this range are invalid in standard CSS. Some HDR color spaces use wider ranges, but standard web colors are 8-bit per channel.

• Is uppercase or lowercase hex better?

  Both are valid in CSS and produce the same color. Convention varies: some style guides prefer lowercase (#2ecc71) for readability, others prefer uppercase (#2ECC71). Be consistent within your project.

• How do I add transparency to a hex code?

  Append two hex digits for the alpha channel: #2ECC71CC. CC hex = 204 decimal = 80% opacity. FF = fully opaque, 00 = fully transparent. Alternatively, use rgba() in CSS.

• Why do some tools give me different hex values for the same color?

  This usually happens due to color space differences (sRGB vs. Display P3), rounding in floating-point calculations, or different color profiles. For web colors, always work in sRGB and ensure consistent rounding.