Does WCAG Contrast Checker upload my files to a server?

No. WCAG Contrast Checker runs entirely in your browser using on-device processing, your files never leave your device.

WCAG Contrast Checker

Check the contrast ratio between two colors against WCAG AA/AAA thresholds.

Runs in your browser

See it in action

Your inputReady to use

Foreground (text)

Background

Large sample text

Normal sized sample text for contrast checking.

17.40:1

AA, normal text (4.5:1)

AA, large text (3:1)

AAA, normal text (7:1)

AAA, large text (4.5:1)

Color Picker & Palette Generator

Pick colors, convert formats, and extract a palette from an image.

Color Harmony Finder

Find complementary, analogous and triadic colors for a base color.

File Converter

Convert data files between CSV, JSON and TSV.

JSON Formatter

Format, validate and minify JSON.