Color Blender: Mix Colors & Make Palettes

What Is Color Blender?

Color Blender is a free online tool that mixes two colors and generates a smooth series of intermediate shades between them. You pick a start color and an end color, choose how many steps you want (anywhere from 2 to 20), and the tool instantly renders a full blended palette. It solves the common design problem of manually calculating intermediate stops for gradients, data visualization scales, or brand palettes — without needing Figma, Illustrator, or any installed software. All computation runs in your browser with zero data sent to a server.

Key Features

• Blend any two colors together — accepts hex values via the text field or native color picker; both inputs update in sync.
• Adjustable steps from 1 to 30 — a slider controls how many colors the palette contains, including the two endpoints. At 2 steps you get only the original pair; at 30 you get a finely graded transition.
• Real-time palette preview — a live gradient bar and a grid of clickable swatches update the moment you move the slider or change either color.
• Copy individual colors or the full palette — clicking any swatch copies its hex value to the clipboard. The "Copy All" button copies the entire comma-separated list of hex codes at once.
• HEX output with RGB and HSL utilities — each swatch label shows the hex value; the source code uses hexToRgb, rgbToHex, and generateBlendedPalette from the shared color-utils library.
• Visual color picker for inputs — a native <input type="color"> sits beside each text field so you can select colors visually or type values directly.
• Export palette as JSON — downloads a color-blend-palette.json file containing color1, color2, steps, and the full palette array.
• Export as CSS variables (Premium) — the PremiumExportButton triggers generateCSSVariables to produce a color-blend-palette.css file with named custom properties.

How to Use Color Blender

Step 1: Set your two base colors

Open the Color Blender tool. You will see two color inputs side by side labeled "Color 1" and "Color 2". Each input has a color picker (the square swatch on the left) and a hex text field.

Click the color picker for Color 1 to open your browser's native color chooser, or type a hex value directly — for example #E63946 for a vivid red. Do the same for Color 2: try #457B9D for a steel blue. A preview rectangle beneath each input shows the selected color with its hex code overlaid in a contrasting text color (the tool auto-detects whether to use black or white text for readability).

Use the Swap Colors button to reverse the two inputs instantly, or click Randomize to pick two new colors at random.

Step 2: Adjust the number of blend steps

Below the color inputs is a "Blend Steps" slider. Drag it left toward 1 for a minimal transition, or right toward 30 for a fine-grained palette. The label shows the current step count and a line beneath the slider shows the total number of colors that will appear in the palette (which equals the step value).

For a standard UI gradient you might want 5–7 steps. For a data visualization color scale, 10–12 steps provides enough range to distinguish categories clearly.

Step 3: Review the blended palette

The "Blended Palette" card appears below the slider. At the top is a continuous gradient bar showing how the colors transition from left to right. Below it, a grid of square swatches — each 64×64 pixels — displays every step.

Hover over any swatch to reveal its hex value in a small overlay. Click the swatch to copy the value to your clipboard. A toast notification confirms the copy.

Below the swatches, a list view shows each color's hex code with a small preview square and an individual copy button.

Step 4: Export your palette

Use one of three export options:

• Copy All — copies the full palette as a comma-separated string (e.g. #E63946, #C25167, #9F6388, ...) ready to paste anywhere.
• Export JSON — downloads color-blend-palette.json with the structure: { "color1": "#E63946", "color2": "#457B9D", "steps": 7, "palette": [...] }.
• CSS (Premium) — downloads color-blend-palette.css with CSS custom properties named --blend-0 through --blend-N.

Practical Examples

Brand gradient for a website header

A designer building a startup landing page needs a gradient from their primary brand color #6C3FF5 (violet) to a secondary accent #00C2CB (teal). Setting 8 steps produces: #6C3FF5, #5C53F2, #4C66EF, #3C7AEC, #2C8DE9, #1CA0E6, #0CB4E3, #00C2CB. This intermediate set maps directly to CSS gradient stops with even spacing, ensuring no abrupt jumps.

Data visualization color scale

A developer creating a choropleth map needs a scale from white #FFFFFF to a deep green #1A6B3A to represent population density. With 10 steps the palette gives ten perceptually distinct shades. The exported JSON can be imported directly into a D3.js or Chart.js configuration as the domain color array.

Accessibility contrast verification

A UI team uses Color Blender to find which intermediate shades between two brand colors maintain WCAG AA contrast against white text. They blend #003566 (navy) to #FFC300 (amber) at 12 steps, then paste each hex into the Contrast Checker to identify the safe range of values.

Tips and Best Practices

Use the randomize button for inspiration. When you are stuck on a palette direction, clicking Randomize generates two entirely random hex colors. The blended result often reveals unexpected combinations worth keeping.

The swap button helps verify directionality. Because the gradient reads left-to-right from Color 1 to Color 2, swapping lets you quickly see whether the transition looks better in the opposite direction.

Save favorite combinations as presets. The PresetsPanel (available to supporters) stores the color1, color2, and steps values together so you can recall an exact palette configuration without re-entering values.

Restore previous blends from History. The HistoryPanel records each "Copy All" action. When you restore a history entry, the tool re-parses the copied hex list, sets Color 1 to the first value, Color 2 to the last, and steps to the total count.

Start at a high step count and work down. If you are unsure how many steps you need, begin at 20 or higher to see the full granularity, then reduce until the transition still looks smooth. Most gradients look good between 5 and 10 steps.

Common Issues and Troubleshooting

Invalid hex value entered manually. If you type an invalid string into the hex text field (such as #ZZZZZZ), hexToRgb returns null and the palette renders as an empty array. The swatches area will be blank. Fix: ensure the hex field contains exactly 6 valid hexadecimal characters preceded by #.

Palette shows only one or two colors. This happens when the slider is at its minimum value of 1 or 2. Drag it right to add intermediate steps.

Copy All produces no output. If the palette is empty (due to an invalid color), the clipboard write attempt still fires but sends an empty string. Fix the color inputs first and confirm the gradient bar is visible before copying.

Export JSON download does not trigger. Some browsers block programmatic link clicks from certain contexts. If the download does not start, check that pop-ups and downloads are allowed for the site in your browser settings.

CSS export requires Premium. The CSS Variables export is gated behind the PremiumExportButton component and requires an active supporter activation. The JSON export is free and available to all users.

Privacy and Security

Color Blender runs entirely in your browser. No color data, palette configurations, or exported files are transmitted to any server. The tool uses only the Web Clipboard API and the Blob/URL APIs — both of which are local browser operations. Preset and history data is stored in your browser's IndexedDB database and never leaves your device. The tool works offline after the initial page load.

Frequently Asked Questions

Is Color Blender free to use?

Yes, Color Blender is completely free with no account required. The core features — blending colors, adjusting steps, copying hex values, and exporting JSON — are available to all visitors. The CSS Variables export is a Premium supporter feature available with a $5 Ko-fi donation that grants 30 days of access.

Does Color Blender work offline?

Yes. Once the page has loaded, Color Blender works without an internet connection. All color math runs in JavaScript in your browser, and no network requests are made during normal use. This makes it safe to use in environments with restricted internet access.

Is my data safe with Color Blender?

Completely safe. No color values, palette data, or export files are ever sent to a server. All processing happens locally in your browser using the Web Clipboard API for copying and the Blob API for file downloads. Your color choices stay entirely on your device.

How does the blending algorithm work?

The tool uses linear RGB interpolation. It converts both hex colors to their RGB components, then calculates evenly spaced intermediate values along the straight line between them in RGB space. While perceptual color spaces like OKLab can produce more uniform-looking gradients for some color pairs, linear RGB interpolation is computationally simple and produces predictable, symmetrical results.

What does the step count include — just intermediates, or the endpoints too?

The step count includes both endpoints. A setting of 5 steps produces exactly 5 colors: the start color, 3 intermediate shades, and the end color. A setting of 2 gives only the two original colors with no blending. The slider ranges from 1 to 30.

Can I enter colors other than hex?

The text input fields accept hex values only. If you want to blend colors from RGB or HSL values, use the Color Converter first to get the hex equivalent, then paste it into Color Blender.

What format is the exported JSON?

The JSON file has four keys: color1 (start hex), color2 (end hex), steps (the slider value), and palette (an array of hex strings from start to end). For a 5-step blend from #E63946 to #457B9D, the palette array contains exactly 5 hex values.

Can I blend more than two colors?

Color Blender supports exactly two input colors. To create a multi-stop gradient with more anchor points, blend each pair of adjacent colors separately and combine the resulting palettes. The Gradient Generator supports multiple color stops natively.

How do I use the palette in CSS?

For the JSON export, iterate the palette array and assign each value to a gradient stop or CSS custom property. For the CSS export (Premium), the downloaded file contains variables named --blend-0 through --blend-N that you can import into any stylesheet.

Does the palette include the original colors?

Yes. The first color in the palette array is always Color 1 and the last is always Color 2. All values between them are computed interpolations.

Related Tools

• Color Mixer — blend two colors with a single ratio slider for a quick one-off mix without generating a full palette.
• Gradient Generator — build multi-stop CSS gradients with precise angle and position controls.
• Color Picker — pick colors from anywhere on your screen or from an uploaded image.
• Color Converter — convert between HEX, RGB, HSL, HSB, and CMYK before blending.

Try Color Blender now: Glyph Widgets Color Blender