This library represents RGBA colors as a single int32 number and avoids allocating memory as much as possible while parsing, handling, and formatting colors, to provide the best possible memory and CPU efficiency.

⚡ Benchmarks

| Library | Operations/sec | Relative speed | | --- | --: | --- | | color-bits | 22 966 299 | fastest | | colord | 4 308 547 | 81.24% slower | | tinycolor2 | 1 475 762 | 93.57% slower | | chroma-js | 846 924 | 96.31% slower | | color | 799 262 | 96.52% slower |

🛠️ Install

pnpm install color-bits

📑 Technical details

Due to the compact representation, color-bits preserves at most 8 bits of precision for each channel, so an operation like alpha(color, 0.000001) would simply return the same color with no modification.

color-bits supports the full CSS Color Module Level 4 color spaces in absolute representations only, so:

• Yes: oklab(59.69% 0.1007 0.1191)
• No: oklab(from green l a b / 0.5)

When parsing and converting non-sRGB color spaces, color-bits behaves the same as browsers do, which differs from the formal CSS spec! In technical terms: non-sRGB color spaces with a wider gamut are converted using clipping rather than gamut-mapping.

For performance reasons, the representation is int32, not uint32. It is expected if you see negative numbers when you print the color value.

Every function is tree-shakeable, so the bundle size cost should be from 1.5kb to 3kb, depending on which functions you use.

📚 Documentation

Docs for color-bits
Docs for color-bits/string

If you're storing and manipulating colors frequently, you should use the color-bits exports directly, e.g.

import * as Color from 'color-bits'

const background = Color.parse('#232323')
const seeThrough = Color.alpha(background, 0.5)
const output = Color.format(seeThrough) // #RRGGBBAA string

The color-bits/string module wraps some of the functions to accept string colors as input/output, which may be useful if you're not storing the colors but just transforming them on the fly. It can be faster than calling the functions separately in some cases.

import * as Color from 'color-bits/string'

const output = Color.alpha('#232323', 0.5) // #RRGGBBAA string

📜 License

I release any of the code I wrote here to the public domain. Feel free to copy/paste in part or in full without attribution.

Some parts of the codebase have been extracted from Chrome's devtools, MaterialUI, and stackoverflow, those contain a license notice or attribution in code comments, inline. Everything is MIT-compatible.