Free online accessibility tools
Ten instant accessibility checkers and simulators that run entirely in your browser. Audit WCAG compliance, simulate color blindness, preview screen reader output, and more — no signup, no upload.
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Color Blind Test
Simulate how your palette looks to people with protanopia, deuteranopia, tritanopia, and achromatopsia.
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WCAG Contrast Checker
Check foreground/background color contrast ratio against WCAG AA and AAA thresholds.
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Alt Text Generator
Generate descriptive alt text suggestions from an image filename or URL path.
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Screen Reader Preview
Paste HTML and see a simplified linearised read-order that a screen reader would announce.
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Keyboard Nav Tester
Interactive checklist and live keyboard-event recorder to audit keyboard accessibility.
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Focus Order Viewer
Paste HTML and get a numbered list of focusable elements in their natural tab order.
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ARIA Cheat Sheet
Searchable reference of all WAI-ARIA roles, states, and properties with usage examples.
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HTML Landmark Checker
Paste HTML and check for proper landmark regions: main, nav, header, footer, aside.
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Motion Reduce Preview
Preview how CSS animations look with prefers-reduced-motion: reduce applied.
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Font Size Tester
Preview custom text at any font size to verify readability for low-vision users.
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Why use browser-based accessibility tools?
Every tool here runs entirely inside your browser — no server round trips, no account needed. Accessibility audits are instant and your HTML never leaves your device. These tools cover the most common accessibility testing tasks for developers, designers, and content creators: from WCAG contrast checking to screen reader simulation and ARIA role reference.