RGB を HEX に変換

変換 Between Color フォーマットs Instantly

Color フォーマットs vary depending on context. Design tools output RGB or HSL values, but CSS needs hex codes. Accessibility tools report RGB, but inline styles might use CSS rgb() notation. Manually 変換ing between フォーマットs is error-prone and slow: look up conversion formulas, do math, verify the result, then type it into code.

This Color 変換er handles all major フォーマットs. Use the visual color picker or enter RGB values directly, and instantly see the hex code, CSS rgb(), CSS hsl(), and HSL breakdown. Copy any フォーマット with one click.

Visual Color Picker or Manual Entry

Color Picker: Click the visual picker and select your color. As you adjust the hue, saturation, and brightness, all output フォーマットs update in real time. This is fastest when you're working visually or need to find the right color.

RGB Sliders: Drag individual R, G, and B sliders (0-255 range) to fine-tune values. This is more precise when you have specific RGB values from a design tool or specification.

Copy Any Output フォーマット: The 変換er 生成s:

• HEX: #4246B0
• HEX with Alpha: #4246B07F (with transparency)
• CSS RGB: rgb(66, 70, 176)
• CSS RGBA: rgba(66, 70, 176, 0.5) (with transparency)
• CSS HSL: hsl(239, 40%, 48%)
• CSS HSLA: hsla(239, 40%, 48%, 0.5) (with transparency)

Each フォーマット has its own copy button, so you can quickly paste the exact フォーマット your code needs.

HSL Breakdown for Understanding Color

Beyond conversion, the tool shows HSL (Hue, Saturation, Lightness) components:

Hue: The actual color (0-360 degrees on the color wheel)

Saturation: How vibrant the color is (0% = gray, 100% = pure color)

Lightness: How bright the color is (0% = black, 100% = white)

This breakdown helps you understand color relationships and makes it easier to adjust colors systematically in CSS or design tools.

Alpha Channel Support

Toggle alpha channel support to work with transparency. When enabled, you get:

• An alpha slider (0-255)
• RGBA and HSLA フォーマットs
• Hex with alpha (#RRGGBBAA) フォーマット

Use this when you need semi-transparent colors for overlays, shadows, or layered UI effects.

Common Web Development Workflows

Design to Code: Copy a color from your design tool (often RGB or hex), paste the RGB values here, copy the exact CSS フォーマット you need, and paste into your stylesheet.

Accessibility Testing: 変換 colors between フォーマットs to test contrast ratios and verify accessibility. Many a11y tools report RGB; quickly 変換 to hex for reference.

Theming & Color Manipulation: Understand the HSL breakdown to systematically 作成 lighter/darker variants of a color by adjusting lightness.

CSS Variables & Design Systems: 変換 colors to your team's preferred フォーマット (hex vs. rgb) for consistency in design system tokens.

Cross-Platform Development: Different platforms prefer different フォーマットs. 変換 once, get all フォーマットs, paste what you need.

Real-Time Visual Feedback

As you adjust values, see the resulting color displayed prominently. This visual feedback helps you verify the conversion is correct before copying.

Completely Local Conversion

Color conversion happens in your ブラウザ. No server needed, no external processing, instant results.