diff --git a/generateSite.js b/generateSite.js
index ec6ced0..b62e3c2 100644
--- a/generateSite.js
+++ b/generateSite.js
@@ -152,7 +152,7 @@ async function serveStaticSite(port = 3000) {
                 console.log(`Parameters: quality=${quality}, width=${width}`);
                 
                 // If quality parameter is present, serve a resized version
-                if (quality && width && (filePath.endsWith('.jpg') || filePath.endsWith('.jpeg') || filePath.endsWith('.png'))) {
+                if (quality && width && /\.(jpe?g|png)$/i.test(filePath)) { // Case-insensitive check
                     try {
                         const Sharp = (await import('sharp')).default;
                         
@@ -175,7 +175,8 @@ async function serveStaticSite(port = 3000) {
                             })
                             .jpeg({
                                 quality: parseInt(quality),
-                                progressive: true
+                                progressive: true,
+                                force: true // Force JPEG output regardless of input format
                             });
                         
                         // Get processed image info