URLs with uppercase letters in their path can cause duplicate content and SEO issues due to case sensitivity.
By Seoxpert Editorial · Published
Most web servers treat URLs as case-sensitive, so /Blog and /blog are different pages. This can create duplicate content, dilute link equity, and confuse users and search engines. Consistent lowercase URLs help maintain a clean, canonical site structure.
Leaving uppercase letters in URLs can lead to duplicate content and fragmented SEO signals.
An automated crawler scans all URLs and flags those with uppercase letters in the path portion.
Apache .htaccess Redirect to Lowercase URLs
RewriteEngine On
RewriteMap lc int:tolower
RewriteCond %{REQUEST_URI} [A-Z]
RewriteRule ^(.*)$ ${lc:$1} [R=301,L]Express.js Middleware to Enforce Lowercase URLs
app.use((req, res, next) => {
const lowercasePath = req.path.toLowerCase();
if (req.path !== lowercasePath) {
return res.redirect(301, lowercasePath);
}
next();
});Because URLs are case-sensitive, uppercase letters can create duplicate pages and split link equity.
You should redirect existing uppercase URLs to lowercase and ensure all future URLs are lowercase.
If you implement proper 301 redirects, users and search engines will be sent to the correct lowercase URLs.
This issue specifically concerns the path portion of the URL, not query parameters.
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