Create UI palettes
Create UI palettes is a common reason people open this page when they need a fast, private result.
A Random Color Generator is a free online instant tool that creates colors and palettes by using cryptographic random values. It is commonly used for design mockups, UI palettes, art prompts, and accessibility checks. This Random Color Generator works on mobile and desktop, requires no signup, and produces HEX, RGB, HSL, or HSLA colors in under one second.
The Random Color Generator creates red, green, and blue channels from crypto.getRandomValues(), then converts the result into HEX, RGB, HSL, or HSLA text. Palette mode generates five swatches, and locked swatches stay in place while the rest refresh. The contrast checker estimates relative luminance and contrast ratio, following the WCAG formula used for text readability checks. Export options are created locally: CSS variables for developers, SVG swatches for simple design handoff, and a PNG card for sharing. Random color is useful for exploration, but accessibility still matters. A color can look attractive and fail contrast for body text. Use the checker before shipping important UI, especially for small text or disabled controls.
| Method | Best use | Why it matters |
|---|---|---|
| crypto.getRandomValues() | Tool results | Designed for strong browser randomness. |
| Math.random() | Simple animation only | Not used for final picks here. |
| Physical draw | Formal offline events | May be needed for regulated contests. |
Methodology cites MDN Web Crypto, NIST SP 800-90A, and WCAG 2.2 where relevant.
Create UI palettes is a common reason people open this page when they need a fast, private result.
Pick art colors is a common reason people open this page when they need a fast, private result.
Test contrast is a common reason people open this page when they need a fast, private result.
Build CSS variables is a common reason people open this page when they need a fast, private result.
Choose brand mockups is a common reason people open this page when they need a fast, private result.
Generate design prompts is a common reason people open this page when they need a fast, private result.
Make color swatches is a common reason people open this page when they need a fast, private result.
Explore HSL values is a common reason people open this page when they need a fast, private result.
Output: #3A7CF2
A single web-ready color.
Output: Five swatches
Lock any swatch and regenerate the rest.
Output: Black text passes
The tool estimates WCAG contrast ratio.
To generate a random HEX color, select HEX output and click Generate. The tool will return a web-ready code such as #3A7CF2. HEX colors are commonly used in CSS, design tools, and mockups because they are compact and easy to copy. You can paste the code into a CSS rule like background-color: #3A7CF2;. If the color is for text or buttons, check contrast before using it in a real design.
To create a random color palette, switch to palette mode and choose how many swatches you want. Generate the first set, then lock any colors you like and randomize the rest. For example, you might keep a strong blue and regenerate four supporting colors around it. This is useful for design mockups, presentation themes, UI experiments, and quick brand mood boards. After you find a usable set, export the values as HEX, RGB, HSL, or CSS variables.
HEX, RGB, and HSL describe the same idea - color - in different formats. HEX is a compact web code, such as #FF5733. RGB uses red, green, and blue channel values, like rgb(255, 87, 51). HSL uses hue, saturation, and lightness, such as hsl(12, 100%, 60%). HEX is quick for CSS, RGB is clear for screen channels, and HSL is easier when you want to adjust brightness or saturation by hand.
Yes, a useful random color generator can check contrast between text and background colors. This matters because a color can look attractive but still be hard to read. For example, light gray text on a white background may feel clean but fail in real use. Use the contrast check before using colors for body text, buttons, labels, or alerts. Random palettes are good starting points, but readability should decide what makes it into the final design.
To export random colors as CSS variables, generate a palette and use the CSS export option. The output may look like --color-1: #3A7CF2; or --primary: #1E40AF;. You can paste those variables into a :root block in your stylesheet and reuse them across buttons, cards, headings, or backgrounds. CSS variables are handy because one value can update many places. Rename the variables if you want clearer design-system labels. This keeps handoff simple for developers.
To lock one color and randomize the rest, click the lock control on the swatch you want to keep, then generate again. The locked color stays in place while the other palette slots change. This is useful when you already like one brand color but need matching accents. For example, lock a navy blue primary color and keep regenerating until you find a softer background and a readable button color. Always check contrast before final use.
Random colors are not automatically safe for website accessibility. A random palette may include combinations that are too light, too low-contrast, or hard to distinguish for some users. Use random generation for inspiration, then test important pairs such as text on background, button labels, links, badges, and error messages. Avoid relying on color alone to communicate meaning. A bright palette can still be usable, but readability and clarity should come before decoration.
To pick random colors for design mockups, generate a palette, lock any swatches you like, and keep refining until the set feels usable. Start with roles instead of just colors: one primary, one accent, one background, one text color, and one alert color. Then export HEX, RGB, HSL, or CSS variables for your design file or prototype. Random colors are a starting point, not a finished brand system, so review contrast and mood before sharing the mockup.
The Random Color Generator is maintained for fast answers, clean citations, and privacy-first browser use.