About Online Color Picker

Online Color Picker is a set of free tools for identifying, converting, combining and testing colors right in your browser, with no sign-up. This page covers who runs the site, how the calculations work and how the project pays for itself.

Who runs the site

The site is built and maintained by Felipe Silva, a developer based in Brazil who runs the project as an individual. His code and other work are on GitHub. There is no company or large team behind it: every tool, article and fix goes through the same hands.

Mission

The goal is simple: color tools that are fast, free and private. Fast because they load and respond instantly, with nothing to install. Free because there is no account or subscription. Private because the heavy lifting happens on your device: images you open in the tools are read by your browser's Canvas API and are never uploaded to the server.

What the site offers

• Image color picker: open a photo or screenshot and click any point to grab its color code.
• Color converter: HEX, RGB, HSL, CMYK, OKLCH and more.
• Contrast checker: tests whether a color pair meets WCAG AA and AAA.
• Palette extractor: finds the dominant colors in an image.
• Color blindness simulator: shows how an image or palette looks with different types of color vision deficiency.
• Color palette generator, CSS gradient generator and color mixer.

Beyond the tools, there is a catalog of named colors with their codes, plus guides on color codes, color theory, accessibility and modern CSS.

How the calculations work

The tools rely on public, documented methods rather than proprietary formulas:

• Conversions between HEX, RGB and HSL follow the standard sRGB formulas. CMYK is a mathematical approximation with no print profile.
• Contrast uses the WCAG 2.x relative luminance formula.
• Color blindness simulation uses the matrices from Machado, Oliveira and Fernandes (2009).
• Palette extraction groups the image's pixels with the k-means algorithm.
• OKLCH and OKLab follow the model published by Björn Ottosson (2020).

As with any simulation or conversion between color spaces, the results are practical approximations for design and development work, not lab measurements.

Editorial policy

Guides and articles are written and reviewed against official specifications, such as the W3C's (including WCAG) and the MDN documentation, and against day-to-day design and development practice. Each guide shows when it was last updated. If you spot a mistake or something outdated, send a correction by email; it will be reviewed and, if valid, applied.

Privacy

The site has no accounts, comments or forms that store data. Preferences such as the theme and your color history are saved only in your browser. Google Analytics and Google AdSense set cookies only according to the choices you make in the consent banner. See the Privacy Policy for details.

How the site is funded

The site shows Google AdSense ads. That revenue covers hosting and development and keeps the tools free. Ads have no influence on the guides or on the results the tools produce.

Contact

Questions, tool ideas and bug reports are welcome. See the contact page or write directly to contato@seletordecoronline.com.br.