How it works
How to use the RGB to Color Name (Colortone)
Enter a RGB color
Type or paste a value — results update instantly as you type.
Read the results
Every equivalent value is listed, with the most relevant one highlighted.
Copy what you need
Each result has its own copy button.
About the RGB to Color Name (Colortone)
Find the named colors that look closest to a RGB value. Matches are ranked with CIEDE2000 — the industry-standard perceptual color-difference formula — against the 148 standard CSS/X11 color names, and each match shows its ΔE (below 1 is indistinguishable to the eye).
Built for developers
Why developers use it
Private by design
Runs 100% in your browser. Nothing you paste is uploaded, logged or stored on a server.
Instant results
Output updates as you type, with precise error locations when something is wrong.
Works offline
Once loaded, the tool keeps working without a connection. Install it as an app if you like.
Free, no sign-up
No accounts, no limits, no watermarks.
FAQ
Frequently asked questions
Is this the same as a Pantone match?
No. Pantone’s color library is proprietary, so this tool matches against the open CSS/X11 named colors. The perceptual matching method (CIEDE2000) is the same one professional color tools use.
Why do some conversions lose a tiny bit of precision?
HEX and RGB use whole numbers from 0–255, while HSL, HSV and CMYK use percentages. Converting between them rounds to the nearest whole value, so a round trip can differ by one unit — invisible to the eye.
Is CMYK here the same as my printer’s CMYK?
This is the standard device-independent formula. Professional print work uses ICC color profiles (such as FOGRA or SWOP) that account for ink and paper, so treat these values as a starting point and proof on the real press.
Is my data uploaded anywhere?
No. Everything runs locally in your browser — nothing you type, paste or open is sent to a server, logged or stored. The tool keeps working offline once the page has loaded.
Keep going
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