URL Normalizer (force lowercase and trailing slash)

wp-url-normalizer A lightweight WordPress plugin that enforces lowercase URLs and trailing slashes via 301 redirects. Zero dependencies, no settings page — just drop it in and it works. What it does - Lowercases all URL paths (/About-Us/ → /about-us/) - Enforces trailing slashes (/about-us → /about-us/) - Collapses double slashes (/about//us/ → /about/us/) - 301-redirects anything that doesn't match canonical format - Preserves query strings (?utmsource=... passes through untouched) What it skips - Non-GET requests (POST, PUT, DELETE — untouched) - WordPress admin (/wp-admin/) - REST API (/wp-json/) - AJAX, CRON, XMLRPC, CLI - Static files (.jpg, .css, .js, .png, etc.) - /wp-content/ and /wp-includes/ Installation 1. Download url-normalizer.php 2. Upload to /wp-content/plugins/ or /wp-content/mu-plugins/ 3. Activate in Plugins → Installed Plugins (not needed for mu-plugins) No configuration needed. Extending via filters Disable path lowercasing (e.g. for OAuth callbacks or case-sensitive slugs): Add custom skip prefixes: Why this exists WordPress doesn't normalise URLs by default. The same page is accessible at: Google treats these as separate URLs, splits your backli