Color Converter (HEX, RGB, HSL) FAQ
How do I convert HEX to RGB?
To convert a hex color code to RGB, split the six-digit hex string #RRGGBB into three pairs, then convert each pair from hexadecimal (base-16) to decimal (base-10).
Example: #FF5733
FF= 255 (Red)57= 87 (Green)33= 51 (Blue)- Result:
rgb(255, 87, 51)
For shorthand hex (#F53), expand each digit to a pair first: #F53 becomes #FF5533. The digits double: F expands to FF, 5 expands to 55, 3 expands to 33.
Eight-digit hex (#RRGGBBAA) works the same way but with an extra pair for the alpha channel. #FF573380 adds 80 (128, or ~50% opacity) for the alpha channel.
For instant conversions, use our color converter. It handles all formats, including short and long hex, with and without alpha.
What is the difference between RGB and RGBA?
RGB defines a color using red, green, and blue channels. RGBA is RGB with an additional Alpha channel that controls opacity. The alpha value ranges from 0.0 (fully transparent) to 1.0 (fully opaque).
rgb(255, 0, 0) /* Fully opaque red */
rgba(255, 0, 0, 0.5) /* Red at 50% opacity */
In modern CSS (CSS Color Level 4), the rgba() alias is no longer needed. The rgb() function now accepts an optional alpha channel:
rgb(255 0 0 / 0.5) /* Modern syntax, red at 50% opacity */
All modern browsers support this syntax. The legacy rgba() function works everywhere and will not be removed, but using rgb() with the slash syntax is the recommended approach for new code.
How do I convert RGB to HSL?
Converting RGB to HSL involves three steps:
- Normalize the RGB values to the 0-1 range (divide by 255)
- Find the min and max of the three normalized values — the average of min and max is the lightness (L)
- Calculate hue and saturation based on which channel is the max and the difference between max and min
The formula varies depending on which color channel dominates:
- If red is the maximum: hue = (green - blue) / (max - min)
- If green is the maximum: hue = 2 + (blue - red) / (max - min)
- If blue is the maximum: hue = 4 + (red - green) / (max - min)
- Saturation depends on lightness: if L > 0.5, saturation = (max - min) / (2 - max - min), otherwise saturation = (max - min) / (max + min)
The math is non-trivial and easy to get wrong, so using a color converter tool is recommended for instant results.
Why do my colors look different on different screens?
Color appearance varies between screens for several reasons:
Screen calibration — Most consumer screens are not color-calibrated. Factory defaults vary widely in brightness, contrast, and color temperature.
Color gamut differences — Different screens support different color ranges. sRGB is the web standard, but many modern phones and laptops support DCI-P3 (25% wider). A color outside the sRGB gamut looks correct on a wide-gamut display but gets clipped or shifted on a standard display.
Display technology — OLED screens produce deeper blacks and more saturated colors than LCD screens. IPS panels have better color accuracy than TN panels.
Viewing angle — Colors shift when viewed from an angle, especially on lower-end displays.
Brightness and ambient light — A screen at 50% brightness in a dark room looks different from the same screen at 100% brightness in direct sunlight.
To minimize differences: Work in the sRGB color space, calibrate your monitor with a hardware calibrator, and test your designs on multiple devices before shipping.
What is the HSL color model good for?
HSL (Hue, Saturation, Lightness) is ideal for programmatic color manipulation. Its key advantage is that one channel carries the "color" information (hue), while the other two control appearance independent of the hue value.
What HSL makes easy:
- Color palettes — Keep the same hue, vary lightness and saturation to create a full color scale
- Hover and active states — Change lightness by a fixed percentage:
hsl(220, 80%, 50%)->hsl(220, 80%, 60%) - Dark mode — Reduce lightness across all colors: subtract 30% from each color's lightness
- Themes — Swap hue values to generate entirely new color schemes from the same saturation/lightness structure
- Disabled states — Reduce saturation to desaturate elements:
hsl(220, 80%, 50%)->hsl(220, 30%, 70%)
What HSL is not good for:
HSL is not perceptually uniform. Two colors with the same lightness value (e.g., hsl(60, 100%, 50%) — bright yellow and hsl(240, 100%, 50%) — pure blue) have very different perceived brightness. For perceptually uniform color manipulation, use OKLCH instead.
What does the # in hex colors mean?
The # prefix (hash or pound sign) tells the CSS parser that the following characters represent a hexadecimal color value. It is the standard notation in CSS and HTML for hex color codes.
The full format is #RRGGBB or #RRGGBBAA:
| Component | Meaning | Example (#FF5733) |
|-----------|---------|---------------------|
| # | Hex prefix | Required indicator |
| RR | Red channel | FF (255) |
| GG | Green channel | 57 (87) |
| BB | Blue channel | 33 (51) |
In HTML, the # is also used for anchor links (<a href="#section">), but in a CSS context or style attribute, it always indicates a hex color. HTML also supports the legacy "named colors" (140 predefined names like red, blue, rebeccapurple) that do not require the #.
What is color gamut and why does it matter?
Color gamut is the range of colors that a device can display or a color space can represent. Think of it as the "vocabulary" of colors available to a screen or file format.
Common color gamuts, from smallest to widest:
| Color Space | Relative Size | Where Used | |-------------|--------------|------------| | sRGB | Baseline | Web standard, most monitors, all browsers | | Adobe RGB | ~50% wider | Professional photography, print | | DCI-P3 | ~25% wider | Modern phones, Macs, many laptops | | Rec. 2020 | ~75% wider | HDR television, high-end displays |
Why it matters: A color outside a screen's gamut cannot be displayed accurately. The device will clip the color to the nearest in-gamut value, or approximate it. This is why a vibrant deep red in a design file might appear dull or muddy on a standard laptop screen.
For web design: Always design in sRGB or check that your colors are sRGB-safe. OKLCH and the display-p3 color space let you target wider gamuts, but you should provide an sRGB fallback for standard screens.
What is the difference between hex and hex with alpha?
Standard hex (#FF5733) uses six digits and has no alpha channel — the color is always fully opaque. Hex with alpha (#FF573380) uses eight digits, adding two more hex digits at the end for the alpha (opacity) channel.
Alpha values in hex:
| Hex Pair | Decimal | Opacity |
|----------|---------|---------|
| 00 | 0 | Fully transparent |
| 80 | 128 | ~50% opacity |
| FF | 255 | Fully opaque |
Examples:
#FF5733 — Solid red-orange, no transparency
#FF5733FF — Same color, fully opaque (redundant FF)
#FF573380 — Same color, 50% transparent
#FF573300 — Same color, completely invisible
There is also four-digit shorthand hex with alpha: #F538 expands to #FF553388 (50% opacity).
Browser support: Eight-digit hex is supported in all modern browsers. For legacy browser support (Internet Explorer), use rgba() instead.
How do I pick accessible colors for my website?
Follow this step-by-step process to build an accessible color system:
1. Start with a primary brand color. Choose a hue that represents your brand, then use HSL or OKLCH to create a full scale from very light (backgrounds) to very dark (text).
2. Set your text to near-black. Body text on white backgrounds should be #1A1A1A to #333333. Never use pure black (#000000) on pure white — it causes eye strain for some readers. Dark gray on white provides better readability.
3. Check every foreground-background pair. Every combination of text and background must meet WCAG standards:
- Normal text: 4.5:1 minimum (WCAG AA)
- Large text: 3:1 minimum (WCAG AA)
- Aim for 7:1 on body text (WCAG AAA)
4. Never use color as the only differentiator. Links must have underlines (not just a different color). Error states must include icons or text. Charts must use patterns or labels.
5. Test with color blindness simulators. Deuteranopia (red-green) is the most common type. Ensure your design works without color perception.
6. Verify in grayscale. If your design loses meaning when converted to grayscale, you are relying too heavily on color to convey information.
Use our color converter to instantly check contrast ratios between any two colors.