Pick colors, convert formats, check contrast.
Colors on the web are commonly specified in three formats: HEX (e.g. #1abc9c), RGB (e.g. rgb(26, 188, 156)), and HSL (e.g. hsl(168, 76%, 42%)). Each format represents the same color in a different color model.
The WCAG (Web Content Accessibility Guidelines) recommends a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. This tool calculates contrast ratios against white and black backgrounds to help you ensure your colors are accessible.
All processing happens entirely in your browser. No data is sent to any server.