FreeKit is a collection of free online tools for developers, SEO professionals, designers, students, content creators, and everyday users.

Are all tools completely free?

Yes. Every tool on FreeKit is free to use without subscriptions or hidden charges.

Do I need to create an account?

No. You can use all tools instantly without creating an account.

No. Most tools process data locally in your browser, and we do not permanently store your inputs.

Can I use FreeKit on mobile devices?

Yes. Every tool is fully responsive and works on smartphones, tablets, laptops, and desktop computers.

How often are new tools added?

We regularly add new tools and improve existing ones based on user feedback and industry needs.

Which browsers are supported?

FreeKit supports all modern browsers, including Chrome, Edge, Firefox, Safari, and other Chromium-based browsers.

Can I share these tools with others?

Absolutely. You are welcome to share FreeKit with friends, colleagues, students, and your team.

What is HEX color format?

HEX (hexadecimal) is a 6-digit code prefixed with # that represents colors in web design. Each pair of digits represents the red, green, and blue components on a scale from 00 (0) to FF (255). For example, #FF5733 means red=255, green=87, blue=51. It is the most widely used color format in CSS and HTML.

What is the difference between RGB and HSL?

RGB (Red, Green, Blue) defines a color by mixing three light channels, each from 0 to 255. HSL (Hue, Saturation, Lightness) defines a color by its hue angle (0-360° on the color wheel), saturation (0-100% color intensity), and lightness (0-100% from black to white). HSL is often more intuitive for designers because you can easily adjust brightness and vibrancy.

What is HSV and how is it different from HSL?

HSV (Hue, Saturation, Value) is similar to HSL but uses 'Value' instead of 'Lightness'. In HSL, 100% lightness is pure white regardless of hue, while in HSV, 100% value means the full, pure color. The difference is most noticeable for saturated colors — HSL's lightness mixes in white, while HSV's value does not. HSV is commonly used in color picker interfaces and image editing software.

What is CMYK color format used for?

CMYK (Cyan, Magenta, Yellow, Key/Black) is a subtractive color model used primarily in print design. Unlike RGB which is additive (used for screens), CMYK represents the ink percentages applied to paper. Each component ranges from 0% to 100%. When you need to prepare designs for print, converting RGB colors to CMYK helps ensure the printed output matches your screen design as closely as possible.

How do I convert HEX to RGB?

To convert HEX to RGB, take each pair of hex digits and convert them from base-16 to base-10. For #FF5733: FF → 255 (red), 57 → 87 (green), 33 → 51 (blue), giving rgb(255, 87, 51). Our Color Converter does this instantly — just type or paste any HEX code and all other formats update in real time.

What color formats are supported in CSS?

Modern CSS supports several color formats: HEX (#FF5733 or #F53 shorthand), RGB (rgb(255, 87, 51) or rgba(255, 87, 51, 0.8)), HSL (hsl(14, 100%, 60%) or hsla()), HSV is not native to CSS but can be converted, and newer formats like oklch(), lch(), and hwb(). CSS Color Level 4 also supports 8-digit HEX with alpha (#FF573380).

What is WCAG color contrast and why does it matter?

WCAG (Web Content Accessibility Guidelines) requires a minimum contrast ratio between text and background colors: 4.5:1 for normal text and 3:1 for large text (AA level). AAA level requires 7:1 for normal text. Our tool shows the contrast ratio of your selected color against white and black backgrounds, helping you ensure your designs meet accessibility standards.

What are color tints, shades, and tones?

Tints are created by adding white to a pure color (making it lighter). Shades are created by adding black (making it darker). Tones are created by adding gray (reducing saturation while keeping similar brightness). Our palette generator creates a range of tints and shades from your selected color, giving you a harmonious set of variations to work with.

How does the color palette generator work?

Our palette generator takes your selected color and creates a set of 5 variations by adjusting the lightness in HSL space. It generates lighter tints, the original color, and darker shades. This gives you a ready-to-use palette that maintains the same hue and works harmoniously together — perfect for UI design, branding, and web development.

Can I use alpha/transparency with these color formats?

Yes. RGBA adds an alpha channel to RGB: rgba(255, 87, 51, 0.5) where 0 is fully transparent and 1 is fully opaque. HSLA does the same for HSL: hsla(14, 100%, 60%, 0.5). In HEX, you can use 8-digit codes like #FF573380 where the last two digits represent alpha (80 in hex = 128 in decimal ≈ 50% opacity). CMYK can also include an alpha value for transparency in design tools.

Color Converter

Convert colors between HEX, RGB, HSL, and more formats.

BeginnerCSS ToolsFreev1.0.0Updated Jun 21, 2025

#6366F1

HEX

RGB

HSL

H (0-360)

S (%)

L (%)

HSV

H (0-360)

S (%)

V (%)

CMYK

C (%)

M (%)

Y (%)

K (%)

Quick Copy

#6366F1

rgb(99, 102, 241)

hsl(239, 84%, 67%)

hsv(239, 59%, 95%)

cmyk(59%, 58%, 0%, 5%)

Contrast Ratios

Aa Sample

vs White

4.47:1Fail AA

Aa Sample

vs Black

4.70:1Pass AA

How to Use the Color Converter

Pick a color — Click the color swatch to open the native color picker, or type a HEX code directly into the input field.
Adjust in any format — Modify values in HEX, RGB, HSL, HSV, or CMYK fields. All other formats update instantly in real time.
Check contrast — Review the WCAG contrast ratios against white and black backgrounds to ensure your color meets accessibility standards.
Copy or generate palette — Click the copy button next to any format string, or switch to the Palette tab to generate tints and shades.

Features

Real-time conversion between HEX, RGB, HSL, HSV, and CMYK formats
Native color picker with large interactive color swatch preview
Individual input fields for every component of each color format
One-click copy for all format strings with visual feedback
WCAG contrast ratio checker against white and black backgrounds
Accessibility pass/fail badges for AA and AAA compliance levels
Automatic palette generation with 5 tints and shades
Clickable palette swatches that apply the color to the converter
Supports both 3-digit (#RGB) and 6-digit (#RRGGBB) HEX input
100% client-side processing — your colors never leave your browser
Clean, responsive design that works on desktop and mobile
Intuitive tabbed interface separating picker and palette views

Understanding Color Formats

HEX — Hexadecimal

HEX is the most common web color format. It uses a # prefix followed by 6 hex digits (0-9, A-F), with two digits each for red, green, and blue. Example: #FF5733. A shorthand 3-digit form (#F53) doubles each digit. HEX is compact and universally supported in CSS and HTML.

RGB & RGBA — Red, Green, Blue

RGB defines colors by mixing three light channels from 0 to 255. It follows the additive color model used by screens. RGBA adds an alpha channel (0-1) for transparency. Example: rgba(255, 87, 51, 0.8). RGB is great when you need precise numeric control over each color channel.

HSL & HSLA — Hue, Saturation, Lightness

HSL uses a hue angle (0-360°), saturation (0-100%), and lightness (0-100%). This model is more intuitive for designers because you can easily create lighter or darker variants by adjusting a single value. HSLA adds alpha for transparency.

HSV & CMYK — Display and Print Models

HSV (Hue, Saturation, Value) is widely used in color picker UIs and image editing — its Value component represents brightness without mixing in white. CMYK (Cyan, Magenta, Yellow, Key/Black) is the subtractive model for print design. Converting between screen (RGB/HSV) and print (CMYK) ensures consistent color across media.

Common Use Cases

Web Design

Convert brand colors from design files to CSS-ready HEX or RGB values for your stylesheet.

UI/UX Development

Generate HSL variations for hover states, disabled states, and theme tokens in design systems.

Print Design Prep

Convert screen colors to CMYK to ensure printed materials match your digital designs.

Accessibility Auditing

Check contrast ratios to meet WCAG AA/AAA guidelines for text readability and compliance.

Brand Identity

Create consistent color palettes with tints and shades for logos, marketing materials, and apps.

Data Visualization

Generate harmonious color scales for charts, graphs, and infographics.

Game Development

Convert colors between engine-specific formats and web-standard CSS values.

Email Development

Ensure colors are in compatible formats for email clients that have limited CSS support.

Color Conversion Tips

Use HSL when building design systems — adjusting the lightness value is the easiest way to create hover, active, and disabled states from a single base color.
Always check WCAG contrast ratios when choosing text and background color pairs. A contrast ratio below 4.5:1 fails AA compliance for normal text.
When converting colors for print, remember that CMYK has a smaller gamut than RGB — some bright screen colors cannot be reproduced in print.
Use Gradient Generator to create smooth CSS gradients using the colors you convert here.
Combine this tool with Box Shadow Generator to create cohesive UI elements with matching colors and shadows.
For consistent spacing and sizing in your color-heavy designs, try Border Radius Generator to round elements perfectly.
When building responsive layouts with colored sections, use CSS Clamp Generator for fluid, responsive sizing without media queries.
The palette generator creates 5 evenly spaced lightness variations — use the darkest for text, mid-tones for backgrounds, and lightest for highlights.
HSV is often better than HSL for creating color picker interfaces because its saturation component does not affect perceived brightness.
For CSS custom properties, prefer HSL format so you can easily create themes by swapping hue values.

Frequently Asked Questions

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Faisal Hossain

Founder & Developer of FreeKit

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How to Use the Color Converter

Pick a color — Click the color swatch to open the native color picker, or type a HEX code directly into the input field.

Adjust in any format — Modify values in HEX, RGB, HSL, HSV, or CMYK fields. All other formats update instantly in real time.

Check contrast — Review the WCAG contrast ratios against white and black backgrounds to ensure your color meets accessibility standards.

Copy or generate palette — Click the copy button next to any format string, or switch to the Palette tab to generate tints and shades.

Features

Real-time conversion between HEX, RGB, HSL, HSV, and CMYK formats

Native color picker with large interactive color swatch preview

Individual input fields for every component of each color format

One-click copy for all format strings with visual feedback

WCAG contrast ratio checker against white and black backgrounds

Accessibility pass/fail badges for AA and AAA compliance levels

Automatic palette generation with 5 tints and shades

Clickable palette swatches that apply the color to the converter

Supports both 3-digit (#RGB) and 6-digit (#RRGGBB) HEX input

100% client-side processing — your colors never leave your browser

Clean, responsive design that works on desktop and mobile

Intuitive tabbed interface separating picker and palette views

Understanding Color Formats

HEX — Hexadecimal

RGB & RGBA — Red, Green, Blue

HSL & HSLA — Hue, Saturation, Lightness

HSV & CMYK — Display and Print Models

Common Use Cases

Web Design

Convert brand colors from design files to CSS-ready HEX or RGB values for your stylesheet.

UI/UX Development

Generate HSL variations for hover states, disabled states, and theme tokens in design systems.

Print Design Prep

Convert screen colors to CMYK to ensure printed materials match your digital designs.

Accessibility Auditing

Check contrast ratios to meet WCAG AA/AAA guidelines for text readability and compliance.

Brand Identity

Create consistent color palettes with tints and shades for logos, marketing materials, and apps.

Data Visualization

Generate harmonious color scales for charts, graphs, and infographics.

Game Development

Convert colors between engine-specific formats and web-standard CSS values.

Email Development

Ensure colors are in compatible formats for email clients that have limited CSS support.

Color Conversion Tips

Use HSL when building design systems — adjusting the lightness value is the easiest way to create hover, active, and disabled states from a single base color.

Always check WCAG contrast ratios when choosing text and background color pairs. A contrast ratio below 4.5:1 fails AA compliance for normal text.

When converting colors for print, remember that CMYK has a smaller gamut than RGB — some bright screen colors cannot be reproduced in print.

Use Gradient Generator to create smooth CSS gradients using the colors you convert here.

Combine this tool with Box Shadow Generator to create cohesive UI elements with matching colors and shadows.

For consistent spacing and sizing in your color-heavy designs, try Border Radius Generator to round elements perfectly.

When building responsive layouts with colored sections, use CSS Clamp Generator for fluid, responsive sizing without media queries.

The palette generator creates 5 evenly spaced lightness variations — use the darkest for text, mid-tones for backgrounds, and lightest for highlights.

HSV is often better than HSL for creating color picker interfaces because its saturation component does not affect perceived brightness.

For CSS custom properties, prefer HSL format so you can easily create themes by swapping hue values.

Frequently Asked Questions