Image Accessibility Checker

Image accessibility is a critical aspect of web accessibility that ensures people with disabilities can perceive, understand, and interact with visual content on websites and applications. Properly implemented accessible images benefit not only users with disabilities but also improve the overall user experience for everyone. For comprehensive performance optimization strategies, explore our React Performance Optimization guide for accessible image loading and optimization techniques.

What This Checker Tests

• Alt text:flags missing alt, placeholders like "image", file names such as "IMG_2041.jpg", a leading "image of", text over about 125 characters and all-caps text. Decorative images get an empty alt="".
• Animation: detects animated GIF, APNG and WebP files, which need a pause control if they play longer than 5 seconds (WCAG 2.2.2) and must not flash more than three times a second (WCAG 2.3.1).
• Text overlay contrast: estimates the worst-case contrast of white and black text placed over the image, against the 4.5:1 and 3:1 thresholds of WCAG 1.4.3.
• Size and markup:reports dimensions, file size and format, and builds an <img> tag with alt, width, height and lazy loading.

It does not recognise what is in the picture or read text inside it, so it cannot tell whether your description is accurate. Only you can judge that.

Why Image Accessibility Matters

Images are a fundamental part of the web experience, conveying information, enhancing content, and creating visual appeal. However, for users with visual impairments who rely on screen readers, images without proper accessibility features are essentially invisible or meaningless. Similarly, users with cognitive disabilities may struggle to understand complex images without proper descriptions.