Can I keep one color while changing the others?

Yes. Lock any current swatch, then regenerate. A locked swatch remains in the same position until it is unlocked or the tool is reset.

Why can a suggested text color still be unsuitable?

The ratio covers pure black or white against one opaque background. Real typography, gradients, opacity, images, focus states, and neighboring colors require testing in context.

Are the HSL values exact?

They are a rounded representation derived from the generated sRGB value. Use the displayed HEX or RGB value when an exact interchange value matters.

Does the tool upload my palette?

No. Generation, locking, conversion, and contrast calculation happen in the browser. A file leaves the browser only when you choose where to save or share it.

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Browser-local color tool

ランダムカラーとパレットジェネレーター

コンパクトなパレットを作成し、気に入った色をロック、黒と白のテキストコントラストを比較し、正確な値をコピーするかJSONとしてエクスポートします。

パレットコントロール

色スタイル

このブラウザではWeb Cryptoを使用します。ロックされた色はそのまま保持されます。スタイルモードはHSLの範囲を制限しますが、色の調和を保証するものではありません。

サイズとスタイルを選択してからパレットを生成してください。

コントラスト比は、不透明な色のみを比較します。それは、全体のインターフェースを保証するものではなく、フォントサイズ、太さ、透明度、グラデーション、または画像は考慮しません。パレットの値はこのコンポーネント内に留まり、URLやストレージに追加されることはありません。通常のサイト分析は、これらの値を受け取らなくても引き続き読み込まれる場合があります。

ルートロケール: ja

How the palette is generated

Each unlocked slot is drawn in this browser from Web Crypto. Full-spectrum mode samples a 24-bit sRGB value. Pastel, vibrant, dark, and light modes sample bounded hue, saturation, and lightness ranges before converting the result to sRGB; grayscale mode uses one shared channel value.

The generator rejects duplicate colors within one palette and keeps every locked slot unchanged. It reports HEX, RGB, and HSL representations of the same opaque color, then calculates contrast against pure black and pure white from relative luminance.

Worked example: build a five-color draft

Choose five colors and Vibrant, generate once, then lock the two colors that suit the project. Regenerate the unlocked slots until the set has useful variety. Copy the CSS variables for a prototype, but test the actual foreground, font, size, states, transparency, and background combinations before treating any pair as accessible.

Useful ways to apply it

Draft a small visual direction before refining a design system.
Create distinct chart, classroom, or game tokens that can be copied exactly.
Compare black and white text as a first contrast check for an opaque swatch.

Limits and checks

Style modes constrain HSL ranges; they do not guarantee harmony, brand fit, or perceptual distance.
A black-or-white ratio for one opaque sRGB swatch does not certify a component or a whole interface against WCAG.
These random values are design inputs, not passwords, cryptographic keys, or proof of uniqueness outside the current palette.

What stays local

Palette values and locks stay in component memory and are not added to the URL or browser storage. Copy and download actions create local clipboard or file output only. Normal site analytics may load, but the palette values are not sent as analytics fields.

Random palette questions

Can I keep one color while changing the others?: Yes. Lock any current swatch, then regenerate. A locked swatch remains in the same position until it is unlocked or the tool is reset.
Why can a suggested text color still be unsuitable?: The ratio covers pure black or white against one opaque background. Real typography, gradients, opacity, images, focus states, and neighboring colors require testing in context.
Are the HSL values exact?: They are a rounded representation derived from the generated sRGB value. Use the displayed HEX or RGB value when an exact interchange value matters.
Does the tool upload my palette?: No. Generation, locking, conversion, and contrast calculation happen in the browser. A file leaves the browser only when you choose where to save or share it.

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Reviewed for functionality and English content on 2026-08-22.