ToolDeck's color tools let you convert between color formats, check accessibility contrast ratios, generate palettes, build CSS gradients, and look up color names or Tailwind classes directly in your browser. The Color Converter handles HEX, RGB, HSL, and HSV in both directions. The Contrast Checker tests WCAG 2.1 AA and AAA compliance. The Palette Generator creates complementary, analogous, triadic, and tetradic schemes from any base color. The CSS Gradient Generator outputs copy-ready linear and radial gradient code. The Color Name Finder matches any value to the nearest CSS named color, and the Tailwind Color Finder maps arbitrary colors to Tailwind utility classes. All tools run client-side with no data sent to any server.
What Are Color Tools?
Color tools are utilities that help developers and designers work with digital color values. Every color on screen is stored as numbers: three channels for RGB (red, green, blue), a hex triplet for CSS shorthand, or angular hue plus saturation and lightness for HSL. Moving between these representations by hand is slow and error-prone, especially when you also need to account for alpha transparency or newer models like OKLCH.
Beyond format conversion, color work involves accessibility testing, palette creation, and gradient authoring. WCAG 2.1 defines minimum contrast ratios (4.5:1 for normal text at AA, 7:1 for AAA) that are hard to verify by eye. Generating harmonious color schemes requires precise angle calculations on the HSL color wheel. CSS gradients need correct syntax for direction, color stops, and fallback values. Doing any of this manually across a design system with dozens of tokens gets tedious fast.
Color tools automate these tasks. They accept a color in one format, compute the math, and return the result you need, whether that is a converted value, a pass/fail accessibility verdict, a set of harmonious swatches, or a CSS code snippet. When the tool runs in the browser, you also avoid uploading sensitive design tokens to third-party services.
Why Use Color Tools on ToolDeck?
ToolDeck's color tools run entirely in your browser. No color values leave your machine, no account is required, and every tool loads instantly without installing extensions or desktop software.
π¨Convert formats in one step
Paste a HEX code and get RGB, HSL, and HSV values simultaneously. No need to chain multiple converters or remember conversion formulas.
πKeep design tokens private
All processing happens client-side. Your brand colors, unreleased palette decisions, and internal design system values stay on your device.
βΏTest accessibility instantly
Check any foreground/background pair against WCAG 2.1 AA and AAA thresholds for both normal and large text. Get the exact contrast ratio, not just a pass/fail label.
β‘Copy production-ready output
Every tool outputs values you can paste directly into CSS, Tailwind config, or design tool input fields. No reformatting needed.
Color Tools Use Cases
Here are six common scenarios where ToolDeck's color tools save time.
Design System Maintenance
When updating a design system, you often receive colors in HEX from a designer but need HSL for CSS custom properties. The
Color Converter translates between formats so you can populate token files without manual math.
Accessibility Audits
During a WCAG compliance audit, every text/background combination must meet minimum contrast ratios. The
Color Contrast Checker shows the exact ratio and AA/AAA pass status for both normal and large text sizes.
Brand Palette Exploration
Starting from a single brand color, you need accent and neutral variants. The
Color Palette Generator computes complementary, analogous, triadic, and tetradic harmonies so you can evaluate options before committing to a palette.
CSS Background Styling
Building a hero section or card background with a gradient requires correct CSS syntax for angles, color stops, and vendor prefixes. The
CSS Gradient Generator lets you build the gradient visually and copy the code.
Tailwind Migration
When migrating a project to Tailwind CSS, you need to map existing HEX or RGB values to the nearest Tailwind utility class. The
Tailwind Color Finder finds the closest match and shows the delta so you can decide whether the approximation is acceptable.
Code Review and Documentation
During code review, a raw HEX value like #708090 means nothing at a glance. The
Color Name Finder identifies it as SlateGray, making reviews and documentation more readable.
CSS Color Model Reference
CSS supports multiple color models. The table below summarizes the six most common formats, their syntax, and typical use cases. All of these are supported by ToolDeck's Color Converter.
| Model | CSS Syntax | Channels | Value Range | Typical Use |
|---|
| HEX | #rrggbb | Red, Green, Blue | 00βff per channel | Most common in CSS, design handoffs, brand guidelines |
| RGB | rgb(r, g, b) | Red, Green, Blue | 0β255 per channel | JavaScript canvas API, computed styles, image processing |
| HSL | hsl(h, s%, l%) | Hue, Saturation, Lightness | 0β360 / 0β100% / 0β100% | Design tokens, theme generation, programmatic shade variants |
| HSV | N/A (not in CSS) | Hue, Saturation, Value | 0β360 / 0β100% / 0β100% | Color pickers (Photoshop, Figma), hardware color calibration |
| OKLCH | oklch(L C H) | Lightness, Chroma, Hue | 0β1 / 0β0.4 / 0β360 | Perceptually uniform palettes (CSS Color Level 4 spec) |
| Named | e.g. slategray | Mapped to RGB internally | 148 predefined names | Prototyping, readable code, quick demonstrations |
CSS Color Level 4 (W3C) also defines lab(), lch(), and color() functions. HEX and RGB remain the most widely supported across browsers and design tools.
How to Choose the Right Color Tool
Each color tool solves a different problem. Use the guide below to find the right one for your task.
- 1
If you need to convert a color between HEX, RGB, HSL, or HSV formats β Color Converter - 2
If you need to verify that a text/background color pair meets WCAG accessibility standards β Color Contrast Checker - 3
If you need to generate a set of harmonious colors from a single base color β Color Palette Generator - 4
If you need to build a linear or radial CSS gradient and get the code β CSS Gradient Generator - 5
If you need to find the human-readable CSS name closest to a given color value β Color Name Finder - 6
If you need to map an arbitrary color to the nearest Tailwind CSS utility class β Tailwind Color Finder
All six tools accept input in multiple formats. If you are unsure which format your color is in, start with the Color Converter, which auto-detects HEX, RGB, HSL, and HSV notation.
Frequently Asked Questions
What is the difference between HEX and RGB color formats?
HEX and RGB represent the same color space. A HEX code like #ff6600 is a hexadecimal encoding of the three RGB channels: ff = 255 (red), 66 = 102 (green), 00 = 0 (blue). The only difference is notation. HEX is more compact in CSS stylesheets, while RGB is easier to manipulate programmatically because each channel is already a decimal integer.
When should I use HSL instead of HEX or RGB?
HSL separates hue (the color itself) from saturation and lightness. This makes it easier to create shade variants: keep the hue fixed, lower lightness for a darker shade, raise it for a lighter tint. Design systems that generate light/dark themes from a single base color often store tokens in HSL for this reason. CSS custom properties also combine well with HSL because you can override individual channels.
What contrast ratio does WCAG 2.1 require for text?
WCAG 2.1 Level AA requires a minimum contrast ratio of 4.5:1 for normal text (below 18pt or 14pt bold) and 3:1 for large text (18pt+ or 14pt+ bold). Level AAA raises those thresholds to 7:1 and 4.5:1 respectively. These ratios are calculated from the relative luminance of the foreground and background colors using the formula defined in WCAG 2.1 Success Criterion 1.4.3.
How many named colors does CSS support?
CSS defines 148 named colors, inherited from the SVG 1.1 and CSS3 color specifications. These range from common names like red, blue, and white to specific names like MediumSlateBlue, PapayaWhip, and LavenderBlush. Named colors map to fixed RGB values. The CSS Color Level 4 specification keeps the same 148 names and does not add new ones. Browsers also recognize the keyword transparent (equivalent to rgba(0,0,0,0)).
Can I use OKLCH colors in CSS today?
Yes. The oklch() function is supported in Chrome 111+, Firefox 113+, and Safari 15.4+. OKLCH is part of the CSS Color Level 4 specification published by W3C. Its main advantage over HSL is perceptual uniformity: two colors with the same lightness value in OKLCH actually look equally bright to the human eye, which is not true for HSL. This makes OKLCH a better choice for generating accessible palettes with consistent perceived brightness.
What is the difference between HSL and HSV?
HSL and HSV both use a cylindrical representation with hue as an angle, but they define brightness differently. In HSL, lightness 50% is the pure color; 0% is black, 100% is white. In HSV, value 100% is the pure color; 0% is black. HSV has no built-in way to reach white without also reducing saturation. Designers and color pickers (Photoshop, Figma) typically use HSV, while CSS uses HSL natively.
How do I find the Tailwind class for an arbitrary HEX color?
Tailwind CSS ships with a fixed palette of about 220 color classes (22 hues times 10 shades each, plus black, white, and transparent). To find the nearest class for a given HEX value, you calculate the Euclidean distance in a perceptual color space (like CIELAB or OKLCH) between your color and every Tailwind swatch. The Tailwind Color Finder on ToolDeck does this automatically and shows the closest match along with the color difference so you can judge if the approximation is good enough.
Is it safe to paste confidential brand colors into an online tool?
It depends on the tool. Any tool that sends your input to a server exposes those values in network traffic and server logs. ToolDeck's color tools run entirely in your browser using client-side JavaScript. No HTTP requests carry your color data to any backend. You can verify this by opening your browser's Network tab while using the tool. For maximum caution, you can also use the tools offline after the initial page load.