What is WCAG?

The Web Content Accessibility Guidelines are the W3C recommendations for making web content accessible, organised under four principles: perceivable, operable, understandable and robust. Success criteria are graded A, AA and AAA.

Also written as Web Content Accessibility Guidelines

Primary sources

Specifications cited by the tools below whose own titles define WCAG.

9 tools that work with WCAG

Files never leave your browser.

Audio & Video Tools1

Subtitle Quality CheckerCheck subtitles against broadcast standards for reading speed, line length and duration.

Color Tools2

CSS Named Colours ReferenceEvery CSS colour name with its HEX, RGB, HSL and OKLCH value, sortable by hue and contrast.WCAG Contrast CheckerCheck colour contrast against WCAG AA and AAA thresholds for accessible text.

Accessibility5

Alt Text CheckerFind images with missing, empty, filename-based or overlong alternative text.Heading Structure ValidatorCheck a page for skipped heading levels, missing or multiple H1s and empty headings.HTML Landmark CheckerCheck a page for the landmark regions screen reader users navigate by.Link Text CheckerFind vague link wording — "click here", "read more", bare URLs and duplicated labels.Palette Accessibility GraderGrade every colour in a palette against one or more backgrounds for WCAG contrast.

On-Device AI1

AI Alt Text GeneratorDescribe an image with a captioning model running in your browser — a first draft for the alt attribute you then edit.

Related terms

Terms that appear alongside WCAG on the same tools.

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