RGB to RGBA converter
Paste a RGB value, get RGBA instantly. Any other format works too.
Opacity chart: HEX alpha and RGBA
In 8-digit HEX the last two digits set opacity: FF is fully opaque, 80 is about 50%, 00 is fully transparent. The table shows the example color at every 5% step.
| Opacity | HEX alpha | HEX | RGBA |
|---|---|---|---|
| 100% | ff | #ff5733 | rgba(255, 87, 51, 1) |
| 95% | f2 | #ff5733f2 | rgba(255, 87, 51, 0.95) |
| 90% | e6 | #ff5733e6 | rgba(255, 87, 51, 0.9) |
| 85% | d9 | #ff5733d9 | rgba(255, 87, 51, 0.85) |
| 80% | cc | #ff5733cc | rgba(255, 87, 51, 0.8) |
| 75% | bf | #ff5733bf | rgba(255, 87, 51, 0.75) |
| 70% | b3 | #ff5733b3 | rgba(255, 87, 51, 0.7) |
| 65% | a6 | #ff5733a6 | rgba(255, 87, 51, 0.65) |
| 60% | 99 | #ff573399 | rgba(255, 87, 51, 0.6) |
| 55% | 8c | #ff57338c | rgba(255, 87, 51, 0.55) |
| 50% | 80 | #ff573380 | rgba(255, 87, 51, 0.5) |
| 45% | 73 | #ff573373 | rgba(255, 87, 51, 0.45) |
| 40% | 66 | #ff573366 | rgba(255, 87, 51, 0.4) |
| 35% | 59 | #ff573359 | rgba(255, 87, 51, 0.35) |
| 30% | 4d | #ff57334d | rgba(255, 87, 51, 0.3) |
| 25% | 40 | #ff573340 | rgba(255, 87, 51, 0.25) |
| 20% | 33 | #ff573333 | rgba(255, 87, 51, 0.2) |
| 15% | 26 | #ff573326 | rgba(255, 87, 51, 0.15) |
| 10% | 1a | #ff57331a | rgba(255, 87, 51, 0.1) |
| 5% | 0d | #ff57330d | rgba(255, 87, 51, 0.05) |
| 0% | 00 | #ff573300 | rgba(255, 87, 51, 0) |
RGB to RGBA examples
About RGB and RGBA
RGB sets red, green and blue from 0 to 255. It describes how a screen mixes light and is written as rgb(255 87 51) in modern CSS.
RGBA is RGB plus an alpha channel for opacity, written as rgba(255, 87, 51, 0.5). Alpha goes from 0 (fully transparent) to 1 (fully opaque). The same opacity can be written as 8-digit HEX, like #ff573380.
How the conversion works
We read the RGB value, convert it to CIE XYZ with the matrices from the CSS Color 4 specification and then into RGBA. Values outside the target gamut are mapped by the CSS Color 4 algorithm, which keeps lightness and hue and reduces chroma.
Questions and answers
How do I convert RGB to RGBA?
Paste or type a RGB value into the field above. PickShade converts it with the CSS Color 4 formulas as you type, and one click copies the RGBA value.
Is the RGB to RGBA conversion exact?
The math is exact and the result is rounded only for display, with enough digits to convert back to the same color. If the color does not fit the target gamut, PickShade warns you and shows the nearest color that fits.
Can I get other formats at the same time?
Yes. Every other format, including OKLCH, Display P3, Tailwind, SwiftUI, Flutter and Android, is listed below the result and copies with one click.
Is this converter free?
Yes. It is free, needs no sign-up and runs entirely in your browser.