Why not just invert all colors for dark mode?

Simple lightness inversion often produces poor results — very light colors become very dark, and mid-tones become muddy. The Perceptual and Shift modes use smarter algorithms that preserve visual hierarchy.

How does the WCAG contrast check work?

Each adapted color is checked against the dark background using the WCAG 2.1 contrast ratio formula. Colors below the minimum ratio are automatically nudged toward higher lightness until they pass.

Is my color data private and secure?

Yes. All calculations run 100% client-side. No color data is ever sent to any server.

How do I use the CSS output in my project?

Paste the CSS output into your stylesheet. The :root block defines light-mode colors; the .dark block defines dark-mode colors. Toggle the dark class on your root element to switch themes.

How do I use the Tailwind config output?

Merge the Tailwind config snippet into your tailwind.config.js theme.extend.colors section. Colors reference CSS custom properties and automatically switch with the dark class.

Is this dark mode color adapter completely free?

Yes. 100% free, no signup required, no usage limits. Adapt as many palettes as you need.

Dark Mode Color Adapter

Convert any light-mode color palette to dark-mode equivalents instantly. Choose from three adaptation modes — Perceptual, Invert, or Shift — with automatic WCAG contrast enforcement. Export as CSS custom properties or Tailwind config. All processing runs locally in your browser. No signup required.

Enter your light-mode color palette and instantly generate dark-mode equivalents with WCAG contrast checks. Export as CSS custom properties or Tailwind config — all processing runs locally in your browser.

Light Mode Palette

ColorHEXName / CSS Variable

Dark Mode Results

→

background

#828282

4.53:1

→

surface

#708599

4.56:1

→

border

#6485af

4.57:1

→

text

#e5e9f0

14.29:1

→

muted

#818ea2

5.24:1

→

primary

#3780f6

4.63:1

→

accent

#9369f7

4.64:1

Adaptation Settings

Adaptation Mode

Dark BG Lightness10%

Background lightness of the dark theme

Saturation Adjust0%

Boost or reduce saturation in dark mode

Min Contrast4.5:1

WCAG AA = 4.5, AAA = 7.0

Export

:root {
  --background: #ffffff;
  --surface: #f8f9fa;
  --border: #e2e8f0;
  --text: #1a202c;
  --muted: #718096;
  --primary: #3b82f6;
  --accent: #8b5cf6;
}

[data-theme="dark"],
.dark {
  --background: #828282;
  --surface: #708599;
  --border: #6485af;
  --text: #e5e9f0;
  --muted: #818ea2;
  --primary: #3780f6;
  --accent: #9369f7;
}

Contrast ratios are calculated against the dark background lightness you set. WCAG AA requires 4.5:1 for normal text. WCAG AAA requires 7:1. Colors that fail the minimum contrast are automatically nudged toward higher lightness until they pass.

Why Use Our Dark Mode Color Adapter?

Instant Dark Mode Generation

Paste your light-mode palette and get dark-mode equivalents in real time. Adjust the adaptation mode and settings and see all colors update immediately.

Secure & Private

All color calculations run 100% client-side in your browser. Your palette data is never sent to a server, so you can safely adapt proprietary brand colors.

WCAG Contrast Checking

Every adapted color is automatically checked against the dark background for WCAG AA (4.5:1) and AAA (7:1) compliance. Colors that fail are nudged until they pass.

100% Free Forever

Completely free with no signup required, no usage limits, and no ads blocking the interface. Adapt as many palettes as you need.

Common Use Cases for the Dark Mode Color Adapter

Adding Dark Mode to Existing Apps

Convert your existing light-mode design tokens to dark-mode equivalents in seconds. Export as CSS custom properties and drop them into your existing stylesheet.

React & Next.js Theming

Generate the dark-mode color tokens for your Tailwind config or CSS-in-JS theme object. The Tailwind export is ready to paste directly into tailwind.config.js.

Design System Maintenance

Keep your light and dark palettes in sync as your design system evolves. Re-run the adapter whenever you update a light-mode color to get the updated dark equivalent.

Brand Color Adaptation

Adapt brand colors for dark-mode interfaces while preserving hue and saturation. The perceptual mode ensures midtones and accents remain visually consistent.

Accessibility Compliance

Verify that all your dark-mode colors meet WCAG AA contrast requirements against your dark background. Colors that fail are automatically adjusted to pass.

CSS Variables & Tokens

Export both light and dark palettes as CSS custom properties with a single click. The output uses data-theme="dark" and .dark selectors for maximum compatibility.

Understanding Dark Mode Color Adaptation

What is a Dark Mode Color Adapter?

A dark mode color adapter converts a light-mode color palette into appropriate dark-mode equivalents by adjusting the lightness of each color in HSL space. Simply inverting colors (100 − L) often produces poor results — very light colors become very dark, and mid-tones become muddy. Our dark mode color adapter uses three smarter algorithms — Perceptual, Invert, and Shift — to produce dark-mode colors that are visually consistent and accessible. All processing runs instantly in your browser with no server upload required.

How Our Dark Mode Color Adapter Works

Enter Your Light-Mode Palette: Add each color with a name (used as the CSS variable name) and its HEX value. Use the preset buttons to load a sample palette instantly.
Choose Adaptation Settings: Select a mode (Perceptual, Invert, or Shift), set the dark background lightness, adjust saturation, and set the minimum WCAG contrast ratio. The dark-mode colors update in real time.
Export CSS or Tailwind Config: Copy the generated CSS custom properties (with both :root and .dark selectors) or the Tailwind config snippet directly to your project.

The Three Adaptation Modes

Perceptual Mode: Uses an S-curve mapping that preserves relative contrast relationships between colors. Light colors (high L) become slightly bright on dark backgrounds; dark colors (low L) become much brighter. This is the recommended mode for most design systems.
Invert Mode: Mirrors lightness around 50% (dark = 100 − light). Simple and predictable, but can produce washed-out results for mid-tone colors. Best for high-contrast, minimal palettes.
Shift Mode: Shifts all colors toward the bright end of the dark theme range. Dark colors get a larger boost than light colors. Good for palettes with many dark tones.
Contrast Enforcement: After adaptation, every color is checked against the dark background using the WCAG contrast formula. Colors that fall below the minimum ratio are automatically nudged toward higher lightness until they pass.

Related Tools

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Enter any HEX or RGB color and instantly find the closest named color from 300+ CSS, X11, and Pantone color names. Search by name or browse the full database — free online color name finder.

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Calculate WCAG 2.1 contrast ratio and check AA/AAA compliance for normal text, large text, and UI components — live preview, HEX and RGB input. Free online color contrast checker.

Color Difference Calculator (ΔE 2000)

Calculate the perceptual color difference (ΔE 2000 / CIEDE2000) between any two colors — enter HEX or RGB values and get the Delta-E score with a visual comparison and CIE L*a*b* breakdown. Free online color difference calculator.

Frequently Asked Questions About the Dark Mode Color Adapter

A dark mode color adapter converts a light-mode color palette into appropriate dark-mode equivalents by adjusting the lightness of each color in HSL space. It also checks WCAG contrast against the dark background and auto-adjusts colors that fail. Our adapter runs entirely in your browser.

Simple lightness inversion (100 − L) often produces poor results. Very light colors become very dark (near the background), and mid-tones become muddy. The Perceptual and Shift modes use smarter algorithms that preserve visual hierarchy and ensure readable contrast.

Perceptual mode uses an S-curve that preserves relative contrast relationships — the best choice for most design systems. Invert mode mirrors lightness around 50% — simple but can produce washed-out mid-tones. Shift mode boosts all colors toward the bright end of the dark theme range.

Each adapted color is checked against the dark background using the WCAG 2.1 contrast ratio formula. Colors that fall below the minimum ratio (default 4.5:1 for AA) are automatically nudged toward higher lightness until they pass. You can set the minimum to 7:1 for AAA compliance.

Absolutely. All calculations run 100% client-side in your browser. No color data is ever sent to any server, so you can safely adapt proprietary brand colors and confidential design tokens.

Copy the CSS output and paste it into your stylesheet. The :root block defines light-mode colors; the [data-theme="dark"] and .dark block defines dark-mode colors. Toggle the dark class or data-theme attribute on your root element to switch themes.

Copy the Tailwind config snippet and merge it into your tailwind.config.js theme.extend.colors section. The colors reference CSS custom properties, so they automatically switch between light and dark mode when you toggle the dark class.

Yes. The tool is 100% free with no signup required, no premium tier, and no usage quotas. Adapt as many palettes as you need directly in your browser.