無料オンラインカラーコードコンバーター
HEX、RGB、HSL、HSV、CMYKの間で色を変換します。
Frequently Asked Questions
What CSS color formats does this tool support?
Supported formats: HEX (#RGB, #RRGGBB, #RRGGBBAA), RGB/RGBA, HSL/HSLA, HSB/HSV, CMYK, and all 140 named CSS colors (red, dodgerblue, coral, etc.).
What is the difference between RGB and RGBA?
RGBA adds an alpha (opacity) channel to RGB. Alpha ranges from 0 (fully transparent) to 1 (fully opaque). rgba(255, 87, 51, 0.5) is the same color as rgb(255, 87, 51) but at 50% transparency.
How do I convert a named CSS color like "coral" to HEX?
Enter "coral" in the input field and the tool looks it up in the 140 named CSS colors: coral = #FF7F50 = rgb(255, 127, 80). All CSS named colors are supported.
What is HSB/HSV and how does it differ from HSL?
HSB (Hue, Saturation, Brightness/Value) is used in Photoshop and many design tools. HSL (Hue, Saturation, Lightness) is the CSS standard. Both use a 0-360° hue wheel but define the other two channels differently.
Can I convert colors with CSS custom properties (variables)?
Enter the actual color value, not the variable name. Resolve --my-color to its value first, then convert. The tool works with actual color values, not CSS variable references.
Is the カラーコードコンバーター free to use?
Yes, the カラーコードコンバーター on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.
How does the カラーコードコンバーター work?
HEX、RGB、HSL、HSV、CMYKの間で色を変換します。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.
Do I need to install anything to use the カラーコードコンバーター?
No installation needed. The カラーコードコンバーター runs entirely in your web browser on any device — desktop, tablet, or mobile.
Is my data safe when using the カラーコードコンバーター?
Completely safe. The カラーコードコンバーター processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
Does the カラーコードコンバーター work offline?
After the page loads for the first time, the カラーコードコンバーター works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.
Can I use the カラーコードコンバーター output in commercial projects?
Yes. The カラーコードコンバーター is a utility tool and its output carries no licensing restrictions. You are free to use results in any project, commercial or personal.
Does the カラーコードコンバーター follow official standards?
Yes. The カラーコードコンバーター is built to comply with the relevant industry standard or specification for this utility type. If you encounter an unexpected result, verify your input against the specification — edge cases outside the standard may produce undefined behaviour.
Does the カラーコードコンバーター work on all browsers?
Yes. The カラーコードコンバーター is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.
How do I save or export my results from the カラーコードコンバーター?
Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.