RGBA to HEX Converter
Convert RGBA values to 6-digit or 8-digit HEX for CSS. Use the sliders or paste an rgba() string to preserve opacity in a compact color code.
When 8-Digit HEX Helps
Eight-digit HEX is compact for design tokens and CSS variables because opacity travels with the color. Use 6-digit HEX for fully opaque colors and 8-digit HEX when the alpha channel matters.
RGBA to HEX Examples
| RGBA | HEX | Result |
|---|---|---|
| rgba(0, 0, 0, 0.5) | #00000080 | 50% black overlay |
| rgba(30, 144, 255, 1) | #1E90FF | Opaque blue |
| rgba(255, 255, 255, 0.8) | #FFFFFFCC | Soft surface |
How the Conversion Works
HEX stores the alpha channel as a hexadecimal byte. An alpha value of 0.5 becomes 128 in decimal,
then 80 in HEX. Fully opaque colors stay as 6-digit HEX.
Frequently Asked Questions
When does HEX need 8 digits?
Use 8-digit HEX when you need transparency. The last two digits represent alpha.
Does the tool preserve opacity?
Yes. If alpha is 1, the tool returns 6-digit HEX. Otherwise it returns 8-digit HEX with alpha.
What happens if RGB values are outside 0-255?
Channel values are clamped to the valid 0-255 range before conversion, matching how RGB bytes are stored.
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