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HEX to RGBA Converter
Add transparency to any HEX color. Type a HEX code, set the opacity and copy a ready-to-use rgba() value or CSS rule. 4 and 8-digit HEX codes keep their own alpha.
3, 4, 6 or 8 digits, with or without #.
Checkerboard
On white
On dark
RGBA
Modern CSS
HEX 8-digit
RGB
CSS rule
Convert a list of HEX codes
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How to use the HEX to RGBA Converter
- Enter a HEX code such as #2F6B4F, 2f6b4f or #fff, or pick a color with the color button.
- Set the opacity with the slider, the number box or a quick preset like 50%.
- Check the preview on a checkerboard, white and dark background.
- Copy the rgba() value, the modern CSS syntax, the 8-digit HEX or a complete CSS rule.
- Have many colors? Open “Convert a list of HEX codes” and paste them all.
HEX to RGBA formula
A HEX color is three (or four) bytes written in base 16. To convert it:
- Remove the # and expand short forms by doubling each digit:
#3A7→#33AA77,#3A78→#33AA7788. - Convert each pair to decimal: first digit × 16 + second digit, where A = 10 … F = 15.
6B= 6 × 16 + 11 = 107. - If there is a fourth pair, alpha = that value ÷ 255. Otherwise use the opacity you choose (0 to 1).
- Write
rgba(R, G, B, alpha).
Opacity percent to HEX alpha
Use this table to write transparency directly in an 8-digit HEX code (#RRGGBB + alpha pair). The alpha pair is round(percent × 255 ÷ 100) in hexadecimal.
| Opacity | rgba() alpha | HEX alpha | Decimal (0–255) |
|---|---|---|---|
| 100% | 1 | FF | 255 |
| 95% | 0.95 | F2 | 242 |
| 90% | 0.9 | E6 | 230 |
| 85% | 0.85 | D9 | 217 |
| 80% | 0.8 | CC | 204 |
| 75% | 0.75 | BF | 191 |
| 70% | 0.7 | B3 | 179 |
| 65% | 0.65 | A6 | 166 |
| 60% | 0.6 | 99 | 153 |
| 55% | 0.55 | 8C | 140 |
| 50% | 0.5 | 80 | 128 |
| 45% | 0.45 | 73 | 115 |
| 40% | 0.4 | 66 | 102 |
| 35% | 0.35 | 59 | 89 |
| 30% | 0.3 | 4D | 77 |
| 25% | 0.25 | 40 | 64 |
| 20% | 0.2 | 33 | 51 |
| 15% | 0.15 | 26 | 38 |
| 10% | 0.1 | 1A | 26 |
| 5% | 0.05 | 0D | 13 |
| 0% | 0 | 00 | 0 |
When to use rgba() colors
- Overlays on photos: a dark rgba(0, 0, 0, 0.5) layer makes white text readable on any image.
- Shadows and borders: semi-transparent colors blend with any background. Try the CSS Box Shadow Generator.
- Hover and selected states: a 10–15% tint of your brand color works on both light and colored backgrounds.
- Need a solid HEX for a tool that does not support transparency? Flatten it with RGBA to HEX.
Frequently asked questions
How do I convert HEX to RGBA?
Split the HEX code into three pairs and convert each from base 16 to decimal: #2F6B4F becomes 2F = 47, 6B = 107, 4F = 79. Add the opacity as a number from 0 to 1 to get rgba(47, 107, 79, 0.5). A 3-digit code like #FFF is expanded first by doubling each digit (#FFFFFF).
What does an 8-digit HEX code mean?
The last two digits are the alpha (opacity) channel, from 00 (fully transparent) to FF (fully opaque). For example #2F6B4F80 has alpha 0x80 = 128, and 128 ÷ 255 ≈ 0.502, so it equals rgba(47, 107, 79, 0.502).
Can I use 8-digit HEX in CSS instead of rgba()?
Yes. #RRGGBBAA and the short #RGBA form are part of CSS Color Level 4 and work in all current browsers. rgba() is still useful for older tools, email templates and when you want to read the opacity at a glance.
What is the difference between rgba() and rgb() with a slash?
They are equivalent. Modern CSS lets you write rgb(47 107 79 / 50%) with spaces and an alpha after a slash; the older rgba(47, 107, 79, 0.5) uses commas. Both are supported by all modern browsers.
What opacity values are common?
Designers often use 10–20% for subtle backgrounds and hover states, 50% for overlays and 70–90% for text on images. Check that text stays readable with a contrast checker.
Is opacity the same as the CSS opacity property?
No. rgba() makes only that color transparent, for example a background, while the opacity property fades the whole element including its text and children.
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