diff --git a/src/BeaconPreloadFonts.js b/src/BeaconPreloadFonts.js
index 36fa8cd..aca9338 100644
--- a/src/BeaconPreloadFonts.js
+++ b/src/BeaconPreloadFonts.js
@@ -40,6 +40,22 @@ class BeaconPreloadFonts {
         ]);
     }
 
+    /**
+     * Checks if a URL should be excluded from external font processing based on domain exclusions.
+     * 
+     * @param {string} url - The URL to check.
+     * @returns {boolean} True if the URL should be excluded, false otherwise.
+     */
+    isUrlExcludedFromExternalProcessing(url) {
+        if (!url) return false;
+        
+        // Check both exclusion arrays for domain filtering
+        const externalFontExclusions = this.config.external_font_exclusions || [];
+        const preloadFontsExclusions = this.config.preload_fonts_exclusions || [];
+        const allExclusions = [...externalFontExclusions, ...preloadFontsExclusions];
+        return allExclusions.some((exclusion) => url.includes(exclusion));
+    }
+
     /**
      * Checks if a font family or URL should be excluded from preloading.
      * 
@@ -247,9 +263,8 @@ class BeaconPreloadFonts {
                     return false;
                 }
                 
-                // Check exclusions instead of allowlist
-                const exclusions = this.config.external_font_exclusions || [];
-                return !exclusions.some(exclusion => link.href.includes(exclusion));
+                // Use the helper method for consistent exclusion logic
+                return !this.isUrlExcludedFromExternalProcessing(link.href);
             } catch (e) {
                 return false;
             }
@@ -427,6 +442,11 @@ class BeaconPreloadFonts {
         try {
           const importUrl = rule.href;
           
+          // Check if URL should be excluded based on external font exclusions
+          if (this.isUrlExcludedFromExternalProcessing(importUrl)) {
+            return;
+          }
+          
           // Prevent infinite loops by checking if URL already processed
           if (processedUrls.has(importUrl)) {
             return;
@@ -474,6 +494,11 @@ class BeaconPreloadFonts {
         } catch (e) {
           // If we can't access cssRules due to CORS, try to process the stylesheet content directly
           if (e.name === 'SecurityError' && sheet.href) {
+            // Check if URL should be excluded based on external font exclusions
+            if (this.isUrlExcludedFromExternalProcessing(sheet.href)) {
+              return;
+            }
+            
             // Prevent infinite loops for CORS fallback too
             if (processedUrls.has(sheet.href)) {
               return;
@@ -502,6 +527,11 @@ class BeaconPreloadFonts {
                 while ((importMatch = importRegex.exec(cssText)) !== null) {
                   const importUrl = new URL(importMatch[1], sheet.href).href;
                   
+                  // Check if URL should be excluded based on external font exclusions
+                  if (this.isUrlExcludedFromExternalProcessing(importUrl)) {
+                    continue;
+                  }
+                  
                   // Prevent infinite loops
                   if (processedUrls.has(importUrl)) {
                     continue;
@@ -553,6 +583,11 @@ class BeaconPreloadFonts {
         while ((importMatch = importRegex.exec(cssText)) !== null) {
           const importUrl = importMatch[1];
           
+          // Check if URL should be excluded based on external font exclusions
+          if (this.isUrlExcludedFromExternalProcessing(importUrl)) {
+            continue;
+          }
+          
           // Prevent infinite loops
           if (processedUrls.has(importUrl)) {
             continue;
diff --git a/test/BeaconPreloadFonts.test.js b/test/BeaconPreloadFonts.test.js
index 481f665..3bd1e0c 100644
--- a/test/BeaconPreloadFonts.test.js
+++ b/test/BeaconPreloadFonts.test.js
@@ -138,6 +138,40 @@ describe('BeaconPreloadFonts', () => {
         sinon.restore(); // Restore sinon mocks
     });
 
+    describe('isUrlExcludedFromExternalProcessing', () => {
+        it('should return false when no exclusions are configured', () => {
+            const result = beaconPreloadFonts.isUrlExcludedFromExternalProcessing('https://fonts.googleapis.com/css');
+            assert.strictEqual(result, false);
+        });
+
+        it('should return true when URL matches external font exclusion', () => {
+            beaconPreloadFonts.config.external_font_exclusions = ['fonts.googleapis.com'];
+            const result = beaconPreloadFonts.isUrlExcludedFromExternalProcessing('https://fonts.googleapis.com/css');
+            assert.strictEqual(result, true);
+        });
+
+        it('should return true when URL matches preload fonts exclusion', () => {
+            beaconPreloadFonts.config.preload_fonts_exclusions = ['fonts.googleapis.com'];
+            beaconPreloadFonts.config.external_font_exclusions = []; // explicitly empty
+            const result = beaconPreloadFonts.isUrlExcludedFromExternalProcessing('https://fonts.googleapis.com/css');
+            assert.strictEqual(result, true);
+        });
+
+        it('should return false when URL does not match any exclusion', () => {
+            beaconPreloadFonts.config.external_font_exclusions = ['fonts.adobe.com'];
+            beaconPreloadFonts.config.preload_fonts_exclusions = ['Roboto'];
+            const result = beaconPreloadFonts.isUrlExcludedFromExternalProcessing('https://fonts.googleapis.com/css');
+            assert.strictEqual(result, false);
+        });
+
+        it('should return false for null or undefined URLs', () => {
+            beaconPreloadFonts.config.external_font_exclusions = ['fonts.googleapis.com'];
+            assert.strictEqual(beaconPreloadFonts.isUrlExcludedFromExternalProcessing(null), false);
+            assert.strictEqual(beaconPreloadFonts.isUrlExcludedFromExternalProcessing(undefined), false);
+            assert.strictEqual(beaconPreloadFonts.isUrlExcludedFromExternalProcessing(''), false);
+        });
+    });
+
     describe('isExcluded', () => {
         it('should return true when fontFamily exactly matches exclusion', () => {
             beaconPreloadFonts.config.preload_fonts_exclusions = ['Arial'];
@@ -1117,6 +1151,18 @@ describe('BeaconPreloadFonts', () => {
             assert.strictEqual(result.styleSheets.length, 0);
             assert.deepStrictEqual(result.fontPairs, {});
         });
+
+        it('should exclude links based on preload_fonts_exclusions config (backward compatibility)', async () => {
+            // Set preload_fonts_exclusions to exclude domain
+            beaconPreloadFonts.config.preload_fonts_exclusions = ['fonts.googleapis.com'];
+            beaconPreloadFonts.config.external_font_exclusions = []; // explicitly empty
+            
+            const result = await beaconPreloadFonts.externalStylesheetsDoc();
+            
+            // Should exclude the link since preload_fonts_exclusions can also contain domains
+            assert.strictEqual(result.styleSheets.length, 0);
+            assert.deepStrictEqual(result.fontPairs, {});
+        });
         
         it('should process links from different origins only', async () => {
             // Set up links with same and different origins