RGBA to HEX Converter
Free, accurate, and instant conversion. Preview your color in real-time on digital and print mockups.
Source Input RGBA
/* CSS Variable */ --color-primary: #000000; /* Standard */ color: #000000; background-color: #000000;
Modernize Your CSS: RGBA to Hex8
For years, web developers had a messy rule: "Use Hex for colors, but switch to RGBA if you need transparency." That rule is dead.
Modern browsers now support Hex8 (e.g., #FF000080). This allows you to define alpha channels directly inside your hex codes, keeping your stylesheets clean, consistent, and uniform.
RGBA (Old)
rgba(0, 0, 0, 0.5)
Verbose, functional syntax.
The Magic
We convert the 0.5 float into a 2-digit Hex integer (80).
Hex8 (New)
#00000080
Concise, modern syntax.
Common Opacity Hex Codes
Memorizing these 2-digit suffixes will speed up your workflow significantly.
Pro Tips for Hex8 in CSS
- • Glassmorphism: Use `#FFFFFF1A` for subtle white frosted glass effects.
- • Dark overlays: `#00000080` is the classic 50% overlay for modals and lightboxes.
- • Tailwind CSS: Add `/50` suffix for opacity: `bg-black/50` generates Hex8 internally.
- • Design tokens: Store all colors as Hex8 for consistency, even if alpha is FF.
Why This Matters for Design Systems
When building a design system (like in Tailwind or CSS Variables), mixing types is fragile. If your primary colors are Hex but your overlays are RGBA, you can't easily perform string manipulation or interpolation. Standardizing on Hex8 means every color in your system is exactly 8 characters long (or 6 defaults to 8). This consistency makes finding, replacing, and tokenizing colors much simpler.
Who Uses RGBA to Hex Conversion?
UI Developers
Clean up stylesheet syntax with consistent Hex8 values.
Glassmorphism Designers
Create transparent overlays and frosted glass effects.
Design Token Engineers
Standardize color formats across entire design systems.
Mobile App Developers
Convert web colors to Android/iOS hex formats.
Frequently Asked Questions
What is Hex8?
Hex8 is an 8-digit hexadecimal color format. The first 6 digits are the color (RRGGBB) and the last 2 digits are the opacity (AA). Example: #FF000080 is Red with 50% opacity.
Is Hex8 supported in all browsers?
Yes, all modern browsers (Chrome, Firefox, Safari, Edge) support 4 and 8-digit hex codes. It is safe to use in production CSS unless you need to support Internet Explorer.
How is Alpha converted to Hex?
The Alpha value (0.0 to 1.0) is multiplied by 255. The result is then converted to Base-16. For example, 0.5 * 255 = 127.5. Rounded to 128. 128 in Hex is '80'.
Why use Hex instead of RGBA?
It is shorter and easier to copy-paste. #00000080 is faster to type than rgba(0, 0, 0, 0.5). It also keeps your code consistent if you already use hex for solid colors.
Can I omit the last 2 digits?
If you omit the last 2 digits, the browser assumes 'FF' (255), meaning 100% opacity (fully solid).
What is 100% opacity in Hex?
It is 'FF'. So white is #FFFFFFFF (but you usually just write #FFFFFF).
How do I make a 50% black overlay?
Use #00000080. This is Black (#000000) + 50% Alpha (80).
Is this useful for Figma/Sketch?
Yes! Figma and Sketch both support Hex8 input. Pasting a Hex8 code will automatically set the fill color and the opacity slider in one go.
What is ARGB and how is it different?
ARGB puts alpha first: #AARRGGBB. This is common in Android development. CSS uses RGBA order (#RRGGBBAA). Be careful when copying between platforms!
Can I use shorthand like #F008?
Yes! 4-digit hex works just like 3-digit. #F008 expands to #FF000088 (Red at ~53% opacity). Each digit is doubled: F→FF, 0→00, 0→00, 8→88.
Does PNG transparency use the same format?
PNG uses RGBA internally (0-255 per channel), which is mathematically identical. The Hex8 output from this tool will match PNG alpha values.
Can PostCSS or Sass convert this automatically?
Yes! PostCSS plugins like 'postcss-color-hex-alpha' can auto-convert Hex8 to RGBA for legacy browser support. Sass also handles rgba() natively.