What is RGB to Hex Conversion?
The RGB to Hex Converter is a free, browser-based tool that converts RGB color values into accurate hex codes with a real-time color preview. It supports standard RGB (0–255), RGBA with alpha/opacity, percentage-based RGB input, and 3-digit hex shorthand, along with reverse hex-to-RGB conversion. Saved colors can be exported as a full palette in CSS custom properties, SCSS variables, or JSON, making it useful for translating design-software colors directly into production-ready code.
How It Works
- Enter your RGB values individually, or paste a full format like rgb(255, 99, 71), rgba(), or a percentage-based value.
- The tool converts each component using the division-by-16 method and combines the results into a six-digit hex code.
- View the live color preview to confirm the result matches the expected color.
- For RGBA input, the alpha value is converted separately and appended as two additional hex digits.
- Copy the hex code (with or without the # prefix), or save it to a palette for export as CSS, SCSS, or JSON.
Common Mistakes to Avoid
❌ Using RGB values outside the 0–255 range
✓ Solution:
values like 300 or -10 are invalid.
❌ Forgetting the # prefix in CSS
✓ Solution:
which is required for hex color values to work.
❌ Confusing RGB order with BGR order
✓ Solution:
used by some non-web systems, which can invert red and blue values if not accounted for.
❌ Assuming a hex color will look identical across every device
✓ Solution:
when color space, monitor calibration, and browser rendering can all cause slight visual differences.
❌ Manually converting non-round values
✓ Solution:
which invites rounding errors an accurate converter avoids the small miscalculations that can shift a brand color to a visibly different shade.
Frequently Asked Questions
Both represent the exact same colors, but Hex is the CSS standard because it's compact and universally supported, while RGB (and its rgba() variant) is common in design software and useful in CSS specifically when transparency is needed.
Divide each RGB value (0–255) by 16. The quotient becomes the first hex digit and the remainder becomes the second, converting any value 10–15 to its letter equivalent (A–F). For example, RGB(128, 255, 0) converts to 80, FF, and 00, giving
Three-digit hex is shorthand for six-digit hex where each pair of digits repeats. It's supported by all modern browsers but only covers 4,096 possible colors rather than the full 16.7 million available in six-digit hex.
Convert the RGB portion to a standard six-digit hex value, then convert the alpha value (0–1) by multiplying by 255 and converting that result the same way, appending it as two additional hex digits.
This is usually caused by color space differences, monitor calibration, or rendering variation between browsers, not an error in the conversion itself.
RGB to Hex Converter: Convert Color Values Instantly for CSS
Your design tool shows a color as RGB, but your CSS file needs a hex code — and converting by hand invites exactly the kind of small error that quietly breaks brand consistency across a website. This converter turns any RGB, RGBA, or percentage-based color into an accurate hex code instantly, with a live preview so you can confirm it matches before it goes into your stylesheet.
What Is RGB to Hex Conversion?
RGB to Hex conversion translates RGB (Red, Green, Blue) color values into their equivalent hexadecimal representation used in CSS. RGB describes a color using three decimal values from 0–255 for red, green, and blue intensity — for example, rgb(255, 99, 71) produces a tomato color. HEX represents the same color as a six-digit code prefixed with # — #FF6347 — where each pair of hex digits corresponds to one RGB component in base-16 (00–FF). Both formats describe the exact same 16.7 million possible colors (256 × 256 × 256); they're simply different notations used in different contexts. RGB is common in design software like Photoshop, Illustrator, and Figma, while HEX is the standard for CSS.
Why Use an RGB to Hex Converter
Get CSS-ready color codes instantly. Convert a value straight from your design software into a hex code ready to paste into a stylesheet, without manual calculation errors.
See the color before you commit to it. A live preview updates as you type or adjust sliders, so you can confirm the result matches what you expected before it goes into production code.
Handle every common input format. Standard RGB, RGBA with alpha/opacity, percentage-based RGB (rgb(100%, 50%, 0%)), and 3-digit hex shorthand are all supported in one tool, along with reverse hex-to-RGB conversion.
Build and export a color palette. Save colors as you work and export the full set as CSS custom properties, SCSS variables, or JSON — useful for keeping a design system consistent across a project.
How the Conversion Works
Each RGB component (0–255) converts to a two-digit hexadecimal number (00–FF) using the division-by-16 method:
- Divide the decimal value by 16.
- The quotient (0–15) becomes the first hex digit; the remainder (0–15) becomes the second.
- Convert any value from 10–15 to its letter equivalent (10=A, 11=B, 12=C, 13=D, 14=E, 15=F).
Example — RGB(255, 99, 71): Red: 255 ÷ 16 = 15 remainder 15 → FF Green: 99 ÷ 16 = 6 remainder 3 → 63 Blue: 71 ÷ 16 = 4 remainder 7 → 47 Result: #FF6347
Converting RGBA (with alpha/opacity): convert the RGB portion normally, then convert the alpha value (0–1) to a two-digit hex value by multiplying by 255 and converting that result the same way. For example, rgba(255, 99, 71, 0.5): alpha 0.5 × 255 = 127.5, rounds to 128, which converts to hex 80 — giving #FF634780 as an 8-digit hex value, supported in modern browsers for semi-transparent elements.
Converting percentage-based RGB: multiply each percentage by 255 ÷ 100 to get the 0–255 value, then convert normally. For example, rgb(100%, 50%, 0%): 100% → 255 → FF, 50% → 127.5 (rounds to 128) → 80, 0% → 00, giving #FF8000.
Recognizable brand colors: Facebook Blue rgb(24,119,242) → #1877F2; classic Twitter Blue rgb(29,161,242) → #1DA1F2; Google's brand palette includes rgb(219,68,55) → #DB4437 (red), rgb(66,133,244) → #4285F4 (blue), rgb(15,157,88) → #0F9D58 (green), and rgb(244,180,0) → #F4B400 (yellow).
Why Accurate Conversion Matters
Brand consistency depends on exact values. A single miscalculated digit produces a visibly different shade. For example, converting the green component of a brand color incorrectly — say, misreading 104 as hex 64 instead of the correct 68 — silently shifts a dark green brand color to a noticeably different shade across a website, marketing material, or product, even though the mistake is a single wrong digit.
Accessibility contrast calculations require precision. WCAG 2.1 Level AA requires a minimum contrast ratio of 4.5:1 for normal text against its background. A small error in a color's hex value can be enough to shift a genuinely compliant color pairing just under that threshold, which is why exact conversion matters for accessibility testing, not just visual appearance.
Design-to-code consistency. Photoshop, Illustrator, and Figma display colors as RGB, while CSS requires hex. Converting manually invites rounding errors on values that don't divide evenly by 16 — an accurate converter ensures what's shown in design software matches exactly what renders in the browser.
3-Digit Hex Shorthand
Three-digit hex codes (#FFF, #F00, #0F0) are shorthand for six-digit codes where each pair of digits is identical: #FFF expands to #FFFFFF, #F00 to #FF0000, #ABC to #AABBCC. All modern browsers support this shorthand. It only covers 4,096 possible colors (16³) rather than the full 16.7 million available in six-digit hex, so it's best reserved for common, easily-matched colors rather than precise brand shades that may not have repeating digit pairs.
Final Checklist for RGB to Hex Conversion
- Confirm RGB values are integers within 0–255
- Verify the source system uses RGB order, not BGR
- For percentage values, confirm the 0%–100% range before converting
- Convert each component to a two-digit hex value (00–FF)
- Combine with the # prefix for CSS use
- Use the live preview to confirm the result matches the expected color
- For RGBA, convert alpha separately and append as two additional hex digits
- Consider 3-digit shorthand only for colors with repeating digit pairs
- Copy the final hex code directly into your CSS
- Re-verify critical brand colors across the actual devices and browsers they'll be used on
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