Seeded random color palette generator

The same inputs always produce the same ordered hex, RGB, and HSL colors, which makes the generator useful when a design must be reconstructed later instead of merely looking random once. Choose random for a broad range, pastel for softer tones, or vivid for stronger saturation. No saved state, network service, clock, or changing random source is involved.

Turn a memorable seed into a repeatable palette

Ordinary random color tools are convenient until you refresh the page, reopen a project, or need a teammate to reproduce exactly what you saw. This generator treats the seed as the identity of the palette. Enter a count of at least one and any non-empty seed, such as a campaign name, project code, dataset label, or test fixture name. The tool hashes that text into a stable numeric state and advances a deterministic generator for every color component. As a result, identical values for count, seed, and harmony return the same ordered palette every time. The response includes hexadecimal colors for CSS, separate red, green, and blue channels for programmatic use, and hue, saturation, and lightness values for adjustment or inspection. Seeds are compared exactly, so capitalization, spaces, punctuation, and trailing characters matter. If a palette is important to a workflow, store the original input fields alongside it. You can then regenerate the palette without storing a separate color table, while still having explicit values available whenever a system needs them.

Choose random, pastel, or vivid treatment

The optional harmony field controls the visual range without compromising determinism. Random is the default and selects hues across the full color wheel with broad, practical ranges for saturation and lightness. It creates varied results that avoid only the most washed-out and nearly black extremes. Pastel keeps the full hue range but raises lightness and uses moderate saturation, producing softer swatches suited to backgrounds, tags, charts, illustrations, and gentle interface accents. Vivid raises saturation and holds lightness near the middle, producing energetic colors that stand out in badges, prototypes, game elements, or data-series markers. These modes are treatments rather than formal color-wheel harmonies: colors are independently derived from the seeded sequence, not forced into complementary, analogous, or triadic spacing. The mode is included in the seeded state, so changing from random to pastel intentionally creates a different sequence instead of merely editing the saturation of existing swatches. Use one mode consistently when palette continuity matters, and record it with the seed and count so every caller requests the same result.

Use deterministic colors in applications and tests

Deterministic palettes are especially useful when an interface needs visual variety but its output must remain stable. A charting service can derive a palette from a report identifier, a documentation build can color examples from a version name, and a test suite can produce realistic swatches without brittle hand-written fixtures. Request only the number of colors you need, up to the published limit of 256, then consume the returned colors in order. The algorithm is pure and bounded: it does not call a network, read saved state, inspect the current date, or use the platform random source. That makes results portable between the browser runner and the API handler and prevents a later request from depending on an earlier one. Remember that deterministic does not mean cryptographically random, and a seed is not a password. This tool is for visual color generation, not security tokens or unpredictable identifiers. API requests use the listed $0.002 base price, while the browser experience can run the same core calculation locally for quick exploration before you automate it.