Color Name Identifier

What is a free color name identifier online?

A free color name identifier online is a tool that takes a colour value — a hex code, an RGB triplet, an HSL value or a pixel from an image — and tells you the closest matching colour name from a large database of named colours. Instead of seeing #DC143C and having to guess whether it is red, pink or crimson, you get an immediate human-recognisable name: Crimson.

This color name identifier online goes further than a simple lookup. It uses a curated database of over 30,000 unique colour names, applies the CIEDE2000 perceptual distance algorithm to find the closest match the way a human eye would, and shows you the five nearest names so you can pick the one that feels right. It also converts your colour to every relevant format (HEX, RGB, HSL, CMYK, LAB), generates four standard colour harmonies, checks WCAG accessibility contrast, and simulates how the colour appears under different types of colour vision deficiency.

Everything runs entirely in your browser. Your colour values, your image uploads and your preferences never leave your device. There is no server, no account, no tracking and no advertising.

Why colour names matter for designers and developers

Colour names are more than a curiosity. They serve practical purposes in every discipline that touches visual design:

• Design systems and style guides. Naming colours (sky-blue-500, brand-coral) makes design tokens readable and maintainable. Designers, developers and stakeholders share a common vocabulary instead of arguing over hex codes.
• CSS and code. CSS supports 140+ named colours natively. Writing color: crimson; is clearer than color: #DC143C;, and some developers prefer named colours for readability in prototypes.
• Branding and marketing. Brands often define their identity around recognisable colour names. Knowing that your brand blue is not "just blue" but specifically Cerulean or Prussian Blue gives you a more memorable brand narrative.
• Communication across teams. When a client says "make it a warmer blue", you need to translate that fuzzy language into a specific, referenceable colour. A colour name identifier gives both sides a precise shared term.
• Accessibility auditing. Knowing the exact colour helps you look up its luminance and contrast ratio against any background, which is critical for WCAG compliance.
• Art and illustration. Painters, illustrators and digital artists often want to name a colour they have mixed or sampled — either to remember it or to describe it to a collaborator.

How colour name identification works

Every colour can be represented as a point in three-dimensional space. The simplest representation is RGB, where a colour is defined by its red, green and blue channel intensities. But RGB space is not perceptually uniform — a distance of 10 units in one region of RGB space can look like a very small difference to the eye, while 10 units in another region looks enormous.

To match colours the way humans perceive them, this tool converts every colour into the CIELAB colour space and computes the CIEDE2000 distance to each entry in the name database. CIEDE2000 is the current industry-standard formula for perceptual colour difference, used by the printing, textile and paint industries. It weights lightness, chroma and hue differences according to how sensitive the human eye is to each, so the resulting nearest-name match feels intuitively correct.

For example, a very pale green might be closer to "mint" in RGB space but closer to "honeydew" in CIEDE2000 space — and honeydew is what a human would actually call it.

Colour formats explained

Every colour can be expressed in multiple formats. This tool displays all of them.

HEX

A hexadecimal string beginning with # followed by six characters (three pairs for red, green and blue). #FF0000 is pure red. Hex is the standard format for web design and CSS.

RGB

Three integers from 0 to 255, one per channel: rgb(255, 0, 0). RGB is the native colour model of screens. It is easy to work with but not intuitive for humans — it is hard to guess what rgb(128, 64, 192) looks like without seeing it.

HSL

Hue (0–360°), saturation (0–100%) and lightness (0–100%). HSL is more intuitive because you can reason about the colour: "make it less saturated" or "rotate the hue by 30 degrees". This tool lets you edit the colour directly in HSL.

CMYK

Cyan, magenta, yellow and black percentages. CMYK is used for print. Converting RGB to CMYK is approximate because print inks and screen light behave differently, but it gives a useful reference when preparing a colour for a print project.

LAB

A device-independent colour space with lightness (L), red-green (a) and blue-yellow (b) axes. LAB underpins CIEDE2000 and is used internally by this tool for matching.

What are colour harmonies?

Colour harmonies are combinations of colours that sit in specific geometric relationships on the colour wheel. They have been studied for centuries — from Newton's colour wheel to modern design theory — and certain combinations are consistently perceived as balanced and pleasing. This tool generates four standard harmonies from your base colour:

Complementary

Two colours opposite each other on the colour wheel, 180° apart. High contrast and visual tension. Complementary pairs are used for call-to-action buttons, accent colours and anything that needs to pop.

Analogous

Three colours within 30° of each other on the wheel. Low contrast and harmonious. Analogous palettes feel calm and cohesive and are common in nature-inspired design.

Triadic

Three colours evenly spaced 120° apart. Vibrant and balanced — the classic primary triad (red, yellow, blue) is a triadic harmony. Triads are used when you want variety without tension.

Split-complementary

A base colour plus the two colours adjacent to its complement (150° and 210°). Softer than a true complementary pair but still high-contrast. Split-complementary is a safe default for many design contexts.

WCAG contrast and accessibility

WCAG (Web Content Accessibility Guidelines) defines minimum contrast ratios between text and background to ensure text is readable for people with low vision or colour vision deficiency. The rule of thumb:

• 4.5:1 for normal text (AA level)
• 3:1 for large text (18pt+ or 14pt bold, AA level)
• 7:1 for normal text (AAA level)
• 4.5:1 for large text (AAA level)

This tool shows the contrast ratio of your chosen colour against both white and black, with the corresponding WCAG rating for each. If your colour fails 4.5:1 against white, use it as text on a black background instead — or adjust the lightness until it passes.

Colour vision deficiency simulation

About 8% of men and 0.5% of women have some form of colour vision deficiency. The most common types are deuteranopia (red-green, green-weak), protanopia (red-green, red-weak) and tritanopia (blue-yellow, rare). This tool simulates how your chosen colour appears under each of these conditions, so you can check whether your design remains distinguishable for everyone.

The 30,000+ colour name database

This tool is built on the color-name-list, an open-source project that assembles the largest curated collection of colour names available. It merges names from multiple historical and contemporary sources — the CSS named colours, the X11 colour list, the ISCC-NBS colour naming system, paint catalogues, Pantone-inspired lists and thousands of community contributions.

The list is strictly curated: duplicates are resolved, naming rules are enforced (APA title case, normalized conjunctions, proper apostrophes), and entries are human-reviewed. The result is a database of over 30,000 unique, high-quality colour names — from the familiar (Crimson, Cerulean, Chartreuse) to the obscure and poetic (Dark Vanilla, Rosy Brown, Fuzzy Wuzzy).

Practical uses for a colour name identifier

Web design and CSS

When writing CSS, you often have a specific colour in mind but only its hex. Naming the colour helps you define design tokens and gives you a human-readable reference for documentation.

App development

Mobile and desktop developers use colour names for asset catalogues and theme files. Knowing the name helps with code review and design handoff.

Brand identity

When defining a brand palette, naming each colour makes the brand system easier to talk about, document and remember.

Print and packaging design

Colour names help bridge the gap between digital and print — you can ask a printer for "a warm terracotta" and be understood, then convert to CMYK in this tool.

Accessibility auditing

When auditing an existing design for WCAG compliance, you often have a screenshot and need to identify the exact colours used. This tool lets you click on any pixel in an uploaded image and see the colour, its name and its contrast ratio.

Frequently asked questions