The Color Mixer produces the same hex output every time you supply the same two HEX inputs and the same ratio, because it computes a deterministic weighted average of the red, green, and blue channels using the formula result = round(A × (1 − ratio) + B × ratio). When you mix two hex colors, the only way to reproduce the exact same result later is to know the two starting hex values and the ratio slider position you used, since every other variable in the math is fixed. The Color Mixer surfaces all three pieces of information up front: the hex values you type into Color A and Color B, the current ratio as a percentage, and the exact result in lowercase six-digit hex plus the equivalent rgb() string. That visibility is what makes the blend repeatable — you can save the inputs and the slider position as a recipe, or simply copy the result hex and re-create the same color in a different tool. Whether you are generating gradient stops, building a palette, or sampling a midpoint between two brand colors, the same inputs always produce the same output, and the math never changes between sessions.
What Makes a HEX Color Mix Reproducible
A digital color blend is reproducible when the same inputs always produce the same numeric output. In the Color Mixer, that means three things must stay constant: the Color A hex value, the Color B hex value, and the ratio slider position. The tool then computes the result by applying per-channel linear interpolation in sRGB space, rounding each channel to the nearest integer between 0 and 255, and rendering the result as a lowercase six-digit hex code.
Because the math is deterministic, there is no random component, no perceptual adjustment, and no color profile negotiation. If you type the same hex values into both color fields and drag the slider to the same percentage, the result panel will display exactly the same hex and the same rgb() string every single time, in every browser, on every device. That is the core promise of sRGB linear interpolation: it is a closed-form arithmetic operation, not a creative judgment.
You can verify the math by hand. For a ratio of 0.5, the formula reduces to round((A + B) / 2) for each channel. Mixing #ff0000 with #0000ff at 50%, the red channel is round((255 + 0) / 2) = 128, the green channel is round((0 + 0) / 2) = 0, and the blue channel is round((0 + 255) / 2) = 128. Converted to hex, that is #800080 — the clean magenta the tool displays. Running the same calculation on any other device, with any other sRGB-aware tool, will produce the same answer.
Inputs You Need to Recreate Any Mix
To repeat a blend later, you only need to capture four pieces of information. The first two are the hex values you originally typed into Color A and Color B, including the leading hash and the casing, since the tool tolerates variations but a clear record removes any ambiguity. The third is the ratio slider position, which the tool always shows as a percentage split such as 70% A / 30% B. The fourth is the result hex itself, which acts as a checksum: if your reproduction does not match the saved result, one of the three prior inputs is off.
Order matters. Swapping Color A and Color B does not change the math at exactly 50%, but at any other ratio it changes which color dominates. For example, mixing #3b82f6 and #ef4444 at 30% A / 70% B leans red, while the same hex pair at 70% A / 30% B leans blue. Always record which hex went into which field.
You do not need to record the input format. The Color Mixer accepts three equivalent notations — short hex like #f00, full hex like #3b82f6, and rgb() strings like rgb(59, 130, 246) — and treats them as the same color once parsed. Extra spaces, missing hash marks, and mixed casing are all tolerated, so whichever notation you used first you can re-enter the same color in any of the others and get the same result.
| Format | Example | How it is parsed |
|---|---|---|
| Short hex | #f00 | Expands to #ff0000 |
| Full hex | #3b82f6 | Used directly as six channels |
| rgb() string | rgb(59, 130, 246) | Decimal channels converted to hex |
| Picker swatch | Click to open | Selected color is parsed in the same way |
Mix Two HEX Colors and Lock In a Repeatable Result
- Type your first color into the Color A field as a hex value such as #f00 or #3b82f6, or paste an rgb() string like rgb(59, 130, 246); extra spaces, missing hash marks, and uppercase letters are all accepted.
- Enter your second color into Color B the same way, choosing either the hex notation or the rgb() notation depending on which you have handy.
- Click the swatch beside either field to open the native color picker if you would rather select the color visually than type it.
- Drag the ratio slider to set the blend proportion — 0% is pure Color A, 100% is pure Color B, and 50% is the exact midpoint between the two channel values.
- Read the result panel for the blended color, which shows the lowercase six-digit hex and the rgb() string in real time as you move the slider.
- Use the gradient bar to preview every step between the two colors at a glance, with eleven evenly spaced blend steps from A to B including both endpoints.
- Click Copy to put the result hex on your clipboard, then paste it into your notes, design file, or stylesheet alongside the Color A hex, the Color B hex, and the ratio you used.
For repeatable precision on the slider itself, the guide on using the ratio slider for precise blends covers how to read the percentage label and how to land on exact splits such as 30/70 without overshoot.
Why the Same Two HEX Colors Always Give the Same Result
The Color Mixer blends in sRGB space using a closed-form weighted average, which means there is no hidden variable that could shift between sessions. The implementation computes result = round(A × (1 − ratio) + B × ratio) for each of the red, green, and blue channels independently, clamps the channel values to the integer range 0–255, and renders the result as a six-digit lowercase hex. There is no dithering, no noise, no time-dependent component, and no profile conversion in the pipeline. Re-enter the same inputs and you will always see the same output.
The ratio is the only knob that is not a hex value, and even it is clamped to the range 0 to 1 before being substituted into the formula. As long as you record the slider position to the nearest whole percent, the result you compute by hand will match the result the tool displays. The label always shows the split in human terms, for example "70% A / 30% B", which is what you should write down next to the two hex values when you save the recipe.
All of the math runs locally in your browser using plain color arithmetic. Nothing is uploaded to a server, there is no sign-up, and there are no usage limits, so the only thing that could vary between two sessions is the inputs you supply. Keep the inputs constant and the result stays constant.
Where Screen Color Mixing Diverges From Real Pigments
sRGB linear interpolation mixes screen light values, not physical pigments. It is additive-style blending, the same math most design tools, CSS gradients, and UI systems use, but it is emphatically not subtractive paint or ink mixing. The practical consequence is that two complementary digital colors blend into a clean midpoint, while the same two pigments on a physical palette combine into a much darker, muddier result. Mixing #ff0000 with #0000ff in the Color Mixer gives #800080, a clean magenta. Mixing red and blue acrylic paint on paper tends to give a dark, desaturated purple or brown.
That difference matters when you are choosing the right tool for the job. If you are matching digital colors for websites, apps, icons, charts, or any on-screen design, sRGB interpolation is exactly what you want — and the Color Mixer's output will agree with CSS color-mix(), Photoshop's RGB blend mode, and most palette tools. If you are trying to predict how real acrylics, oils, or printer inks will combine on paper, a screen-based blend will not model the subtractive physics, and no honest on-screen tool can.
The gradient bar makes the additive nature visible. It shows eleven evenly spaced blend steps between your two colors, including both endpoints, so you can see the entire transition at a glance and pick the intermediate that fits your design. Because every step is computed by the same deterministic formula, the entire gradient is reproducible from the two inputs alone — you do not need to save each intermediate color individually.
Related reading: Color Palette Generator From Image: Start With a HEX.