Hex, RGB, and HSL color codes are three ways of writing down the exact same color so a screen renders it identically every time. Hex is the compact six-character form designers paste everywhere; RGB describes a color as amounts of red, green, and blue light; HSL describes it as hue, saturation, and lightness in a way humans can reason about. Knowing how each format works, and which one to save where, is the difference between a brand color that stays exact and one that drifts a shade with every reuse.
What hex color codes are
A hex code is a six-digit value written after a #, like #FF0000 for pure red. The six digits are three pairs, red, green, blue, each pair a number from 00 to FF in hexadecimal (base 16), which is just 0 to 255 in everyday counting. So #FF0000 means red at maximum, green at zero, blue at zero.
Hex is the lingua franca of digital design because it is short, unambiguous, and copy-pasteable. You will see it in CSS, design tools, and brand documents. A three-digit shorthand also exists, #F00 expands to #FF0000, but for brand work, always store the full six digits to avoid rounding surprises.
The one thing hex does not give you is readability. You cannot glance at #7A3FB2 and know it is a medium purple, or nudge it warmer without trial and error. That is where the other two formats earn their place.
What RGB color codes are
RGB writes the same color as three numbers from 0 to 255: rgb(255, 0, 0) is the same pure red as #FF0000. It is the native language of screens, which build every pixel by mixing red, green, and blue light. Add all three at full strength and you get white; set all three to zero and you get black.
RGB has a close relative, RGBA, that adds a fourth value for alpha (opacity): rgba(255, 0, 0, 0.5) is that red at 50 percent transparency. Use RGBA when a color needs to sit over something else, an overlay, a tint, a caption background on video.
RGB is more legible than hex for people who think in "how much of each light," but it shares hex's core limitation: the three numbers are tangled together. Making a color lighter means changing all three at once, which is awkward to do by hand.
What HSL color codes are
HSL untangles a color into three intuitive dimensions, written as hsl(0, 100%, 50%), again, the same pure red:
- Hue is the color itself, measured as an angle from 0 to 360 degrees around a color wheel.
0is red,120is green,240is blue. - Saturation is how vivid the color is, from
0%(gray) to100%(full intensity). - Lightness is how light or dark, from
0%(black) through50%(the pure hue) to100%(white).
HSL is the format to reach for when you want to reason about color rather than just store it. Need a darker version of a button for its hover state? Drop the lightness. Want a muted variant for a background? Lower the saturation. Building a palette of related accents? Keep the hue and walk the lightness. This is why HSL is so useful when you are building a brand color palette and need tints and shades that clearly belong to the same family.
Hex vs RGB vs HSL: when to use each
All three describe the same colors in the standard screen color space, so converting between them is lossless for ordinary use. The question is which one fits the moment.
| Format | Looks like | Best for |
|---|---|---|
| Hex | #FF0000 | Storing and pasting exact brand values; design tools and CSS |
| RGB / RGBA | rgb(255, 0, 0) | Screen-native work; transparency and overlays via alpha |
| HSL | hsl(0, 100%, 50%) | Reasoning about color; generating tints, shades, and palettes |
A useful rule: store in hex, think in HSL, reach for RGBA when you need transparency. You will rarely need to convert by hand, design tools show all three side by side, but understanding what each number means is what lets you adjust a color deliberately instead of guessing. If you want the why behind those choices, our primer on color theory basics for content creators covers how hue and contrast actually read to a viewer.
How to find your exact brand color values
If your brand color currently lives as "the blue from the logo," you have a precision problem waiting to happen. To pin it down:
- Start from the source file. Open your logo or brand artwork in a design tool and use its eyedropper or color panel to read the exact value. The source file is the ground truth, not a screenshot.
- Capture all three formats. Note the hex, RGB, and HSL for each core color so you always have the right one on hand.
- Define the supporting cast. Record your background, text, and accent colors too, a brand is a system, not a single swatch.
- Write down usage rules. Which color is primary, which is for accents only, and what minimum contrast you require for text. Color choices are only half the system; pairing them with the right type matters just as much, which is why a solid font pairing belongs in the same document.
Saving your colors in a brand kit
Knowing your codes is step one. The payoff comes when every asset reads from a single source of truth instead of from someone's memory. In CoreReflex, that source is the brand kit in the Brand pillar: paste your exact hex, RGB, and HSL values once, and every generation, video, image, slide, or motion graphic, pulls from the same definitions.
That matters more in motion than anywhere else, because a color that drifts even slightly between shots reads as sloppy. Storing precise values up front is the foundation for keeping brand colors consistent in video, where the on-brand quality check then scores each shot against your kit before it ships. The codes you save today become the rule the system enforces on every future asset. You can see exactly how the kit ingests and applies them in the product documentation, and you will find more color and type guidance across the Brand blog.
Frequently asked questions
What is the difference between hex, RGB, and HSL?
They are three notations for the same screen colors. Hex (#FF0000) is a compact six-character code, RGB (rgb(255, 0, 0)) lists amounts of red, green, and blue light, and HSL (hsl(0, 100%, 50%)) breaks a color into hue, saturation, and lightness. Hex is best for storing and pasting, RGB for screen and transparency work, and HSL for adjusting and generating related colors.
How do I find the hex code for my brand color?
Open your logo or brand artwork in a design tool and use the eyedropper or color panel to read the value directly from the source file. Avoid sampling from a screenshot or a compressed image, since that can shift the color. Once you have the exact swatch, record its hex, RGB, and HSL together.
Which color format should I save in my brand kit?
Save hex as your canonical value because it is compact and unambiguous, and keep the RGB and HSL equivalents alongside it for when you need transparency or want to generate tints and shades. In a CoreReflex brand kit you can store all three, and every asset will read from the same definitions.
Are hex, RGB, and HSL interchangeable?
For standard screen work, yes, they describe the same colors and convert losslessly, so you can move between them freely. The reason to keep all three is convenience: each format is easier for a different task, from pasting an exact value to nudging a hue.
Lock your colors in once
The codes are simple; the discipline is in storing them precisely and using them everywhere. Capture your hex, RGB, and HSL once, save them where every asset can reach them, and let the system hold the line. Start free with no credit card, build your brand kit, and watch your colors stay exact across every video, image, and slide you generate.