Web & Accessibility Tools — Free Online

Check foreground and background color contrast ratio against WCAG AA and AAA accessibility standards.

Preview how your page looks when shared on Google, Twitter, Facebook, and LinkedIn.

Break down any CIDR block into network address, broadcast, host range, subnet mask, and host count.

Dissect any URL into its components: scheme, host, port, path, query parameters, and fragment.

Encode special characters to HTML entities (named, decimal, or hex) and decode them back.

Generate a complete set of HTML meta tags: title, description, Open Graph, Twitter Card, viewport, charset, and canonical.

Paste HTTP response headers and get a plain-English explanation of each directive with security and caching insights.

Generate a modular type scale from a base size and ratio. Preview each step and copy the CSS custom properties.

Pick a base color and generate complementary, analogous, triadic, and split-complementary palettes with HEX, RGB, and HSL values.

Build a valid robots.txt file with a guided interface. Add rules per user-agent, set crawl delay, and include your sitemap.