Valid RGB input
Enter red, green and blue as 0–255 values; percentages are also parsed and normalized to integer channels.
RGB to CSS Color Name (Colortone) Converter
Convert RGB used for canvas, pixel data, CSS and graphics APIs into a CSS named-color lookup or the nearest built-in CSS name, ready for readable CSS keywords and human-friendly swatch labels.
Values are converted in the page with local TypeScript functions. No color value needs to be uploaded for this calculation.
1. Enter RGB Values
Choose a color visually, use sliders, or paste a value.
255
99
71
Quick Presets
2. Live preview
tomato
tomato
PreviewOriginal
rgb(255, 99, 71)
Lighten 20%
rgb(255, 130, 108)
Darken 20%
rgb(204, 79, 57)
Complementary
rgb(71, 227, 255)
Color Information
Color Name:tomatoBrightness:56%Luminance:0.306Contrast with White:2.95 : 1Contrast with Black:7.13 : 1
Visual Comparison
Aa
With White Text
Aa
With Black Text
3. Results
tomato
Other Formats
HEX#FF6347
RGBrgb(255, 99, 71)
RGBArgba(255, 99, 71, 1)
HSLhsl(9, 100%, 64%)
HSLAhsla(9, 100%, 64%, 1)
HSVhsv(9, 72%, 100%)
CMYKcmyk(0%, 61%, 72%, 0%)
Nametomato
Color Palette
Did you know?
You can pick a color from your screen in browsers that support the EyeDropper API.
Direct answer
Convert RGB used for canvas, pixel data, CSS and graphics APIs into a CSS named-color lookup or the nearest built-in CSS name, ready for readable CSS keywords and human-friendly swatch labels. Channel normalization and integer/percentage formatting can make a RGB → COLORTONE → RGB round trip differ from the starting value.
What this tool does
Convert RGB used for canvas, pixel data, CSS and graphics APIs into a CSS named-color lookup or the nearest built-in CSS name, ready for readable CSS keywords and human-friendly swatch labels. Use this focused route when your source is already RGB and the next system specifically expects CSS Color Name (Colortone); use the general converter when you need several representations at once.
Verified capabilities
Read the COLORTONE result
a CSS named-color lookup or the nearest built-in CSS name
Check the accuracy boundary
Channel normalization and integer/percentage formatting can make a RGB → COLORTONE → RGB round trip differ from the starting value. Compare the result with the intended destination before reusing it.
When to use it
- Use this focused route when your source is already RGB and the next system specifically expects CSS Color Name (Colortone); use the general converter when you need several representations at once.
- Convert RGB used for canvas, pixel data, CSS and graphics APIs into a CSS named-color lookup or the nearest built-in CSS name, ready for readable CSS keywords and human-friendly swatch labels.
- RGB → COLORTONE: readable CSS keywords and human-friendly swatch labels.
How to use the tool
Enter the source color
Enter red, green and blue as 0–255 values; percentages are also parsed and normalized to integer channels. In “How to use the tool: Enter the source color”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
Review the normalized preview
Use the sliders, direct field, preset swatches or system picker when available. The preview exposes normalization before COLORTONE formatting.
Copy the target value
Copy the COLORTONE row. Alternate rows stay visible for comparison, but this page's intent remains RGB → COLORTONE.
Check the accuracy boundary
Channel normalization and integer/percentage formatting can make a RGB → COLORTONE → RGB round trip differ from the starting value. Compare the result with the intended destination before reusing it. Use the preview to catch a parsing mistake before copying the COLORTONE row.
Controls explained
Valid RGB input
Enter red, green and blue as 0–255 values; percentages are also parsed and normalized to integer channels. In “Controls explained: Valid RGB input”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
Read the COLORTONE result
a CSS named-color lookup or the nearest built-in CSS name. Colortone is AppKiro's label for CSS color-name lookup, not a standard color space. Forward matching uses Euclidean RGB distance.
How the result is produced
Enter red, green and blue as 0–255 values; percentages are also parsed and normalized to integer channels. The workbench parses the source to an sRGB triple, then formats a CSS named-color lookup or the nearest built-in CSS name. The workbench assumes sRGB-style 0–255 channels and rounds normalized values. Colortone is AppKiro's label for CSS color-name lookup, not a standard color space. Forward matching uses Euclidean RGB distance.
Accuracy and limitations
- Channel normalization and integer/percentage formatting can make a RGB → COLORTONE → RGB round trip differ from the starting value.
- The workbench assumes sRGB-style 0–255 channels and rounds normalized values.
- Colortone is AppKiro's label for CSS color-name lookup, not a standard color space. Forward matching uses Euclidean RGB distance.
Processing and privacy
Values are converted in the page with local TypeScript functions. No color value needs to be uploaded for this calculation.
Practical tips
- Keep a copy of the original RGB value when comparing rounded COLORTONE output.
- Use the preview to catch a parsing mistake before copying the COLORTONE row.
Troubleshooting
Why is my RGB input rejected?
Enter red, green and blue as 0–255 values; percentages are also parsed and normalized to integer channels. In “Troubleshooting: Why is my RGB input rejected?”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
Why does RGB differ after converting to COLORTONE and back?
Channel normalization and integer/percentage formatting can make a RGB → COLORTONE → RGB round trip differ from the starting value. In “Troubleshooting: Why does RGB differ after converting to COLORTONE and back?”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
Check the accuracy boundary
Channel normalization and integer/percentage formatting can make a RGB → COLORTONE → RGB round trip differ from the starting value. Reset the tool and retry with a known supported value before reporting an algorithm error.
Questions about this tool
When should I use the focused RGB to COLORTONE converter?
Use this focused route when your source is already RGB and the next system specifically expects CSS Color Name (Colortone); use the general converter when you need several representations at once. In “When should I use the focused RGB to COLORTONE converter?”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
Why is my RGB input rejected?
Enter red, green and blue as 0–255 values; percentages are also parsed and normalized to integer channels. In “Why is my RGB input rejected?”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
Why does RGB differ after converting to COLORTONE and back?
Channel normalization and integer/percentage formatting can make a RGB → COLORTONE → RGB round trip differ from the starting value. In “Why does RGB differ after converting to COLORTONE and back?”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
How is the closest CSS color name chosen?
Colortone is AppKiro's label for CSS color-name lookup, not a standard color space. Forward matching uses Euclidean RGB distance. In “How is the closest CSS color name chosen?”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
What syntax does the COLORTONE result use?
a CSS named-color lookup or the nearest built-in CSS name. readable CSS keywords and human-friendly swatch labels. Colortone is AppKiro's label for CSS color-name lookup, not a standard color space. Forward matching uses Euclidean RGB distance.
How is the RGB input normalized before conversion?
Enter red, green and blue as 0–255 values; percentages are also parsed and normalized to integer channels. The workbench assumes sRGB-style 0–255 channels and rounds normalized values.
Continue your color workflow
Use this focused route when your source is already RGB and the next system specifically expects CSS Color Name (Colortone); use the general converter when you need several representations at once. In “Continue your color workflow”, apply this specifically to RGB to CSS Color Name (Colortone) Converter.
Continue with a related tool
Open the first related route when you need to continue beyond the focused RGB → COLORTONE conversion.
Color Converter for HEX, RGB, HSL, LAB and OKLCH