Random Color Generator
Generate random colors in HEX, RGB, and HSL formats. Generate a single color or a set of 5 random colors at once for design inspiration.
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How to use this calculator
Each channel is independently randomised. HSL is converted from RGB: H = hue (0°–360°), S = saturation (%), L = lightness (%).
- 1
Set the number of colors to generate (up to 10).
- 2
Choose a style: any, bright, pastel, dark, or light.
- 3
Set a seed number to reproduce the same set of colors later.
Frequently asked questions
Why does a seed make the colours repeat?
With a non-zero seed the tool runs its own small linear congruential generator, so the same seed, style and position always give the same colour. Seed 42 in Any mode returns #401693, #396007 and #721EDF as the first three colours every time. Asking for 5 colours instead of 3 with the same seed keeps those three and adds two more. With the seed left at 0, the starting value is taken from Math.random, so every click differs.
Are these colours suitable for security or fair random draws?
No. The sequence comes from a simple arithmetic generator (or, unseeded, from Math.random), which is fine for design exploration and says nothing about unpredictability. Do not use it for tokens, secrets or any process where someone benefits from guessing the next value.
What RGB ranges do the five styles use?
Any: each channel 0–255. Pastel: each channel 128–255. Light: each channel 175–255. Dark: each channel 0–100. Bright: one randomly chosen channel is 155–255 and the other two are 0–100, which gives saturated reds, greens and blues rather than neon mixes. The ranges overlap on purpose in places, so pastel and light colours can look alike.
How are HEX, RGB and HSL produced?
The tool picks three integer channel values, writes HEX in upper case as #RRGGBB, prints rgb(r, g, b), and converts the same values to HSL with the standard formula. Hue is in degrees and saturation and lightness are whole percentages, rounded, so converting the HSL back may land one step away from the original RGB.
How many colours can I generate, and what if the field is blank?
Between 1 and 10. Values outside that range are clamped, so a count of 0, which is also what an emptied box becomes, gives 1 colour. A seed of 0 means random.
Does it check contrast or accessibility?
No. It reports colour values only. Text contrast against a background, colour-blind safety and brand fit all need a separate check, and nothing here ranks or filters colours by those qualities.
Does it build a harmonious palette?
No. Each colour is drawn independently within the style’s range, so five results share a brightness band but not a hue relationship. Treat them as starting points to pick from and adjust.
Random colours as HEX, RGB and HSL, with optional seeds
What the style options actually change
Every colour begins as three channel numbers for red, green and blue. The style decides the range each number may take, and nothing else. Pastel and light both push channels towards the top of the scale, which makes them pale; dark keeps every channel at 100 or below. Bright is the only style that treats the channels differently: it fixes one channel high and holds the other two low. HEX, RGB and HSL are then just three notations of the same three numbers.
| Style | Red / green / blue range | Typical look |
|---|---|---|
| Any | 0–255 each | Anything, including murky mid-tones |
| Bright | One channel 155–255, others 0–100 | Saturated primaries and near-primaries |
| Pastel | 128–255 each | Soft, chalky |
| Light | 175–255 each | Very pale |
| Dark | 0–100 each | Deep, near black |
Worked example: a seed of 42
With the seed set to 42, three colours and the Any style, the tool returns #401693 (rgb(64, 22, 147), hsl(260, 74%, 33%)), then #396007 (rgb(57, 96, 7), hsl(86, 86%, 20%)), then #721EDF (rgb(114, 30, 223), hsl(266, 76%, 50%)). Switching only the style to Pastel keeps the same underlying random numbers but squeezes them into 128–255, so the first colour becomes #A08BC9 (rgb(160, 139, 201)). The hue stays near 260 degrees; what changes is that the colour is lighter and less saturated. That relationship is handy when you want a lighter companion for a colour you already like.
Worked example: other styles on seed 7
Seed 7 with Dark and two colours gives #185B3D and #5D0556. The same seed with Bright gives #D85B5D and #BF5605, where one channel in each sits in the 155–255 band. A single Light colour on seed 7 is #C2F8E0, which is hsl(153, 79%, 87%). Because the output is repeatable, you can store the seed and style next to a design decision and regenerate the same colours later without copying the values.
How the seeded generator works
The seeded sequence uses the recurrence s = (s × 1664525 + 1013904223) mod 2^32, a classic linear congruential generator, and converts each state to a number between 0 and 1. Seeds are rounded to whole numbers. This is chosen for repeatability, not statistical quality, so very long runs would show patterns, though ten colours at a time is far inside that. With the seed at 0 the starting state comes from Math.random, so results cannot be reproduced.
Using the output
Copy the HEX value into CSS or a design tool, or use the rgb() and hsl() strings directly. The HSL figures help when you want to adjust a colour deliberately, for example keeping the hue but raising lightness. Remember that the tool has no notion of contrast ratio, so check text and background pairs separately before using any generated colour for something readable.
Learn more from an authoritative source:
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →