diff --git a/electron/main/renderer.js b/electron/main/renderer.js
index ad684ef..1bf23ea 100644
--- a/electron/main/renderer.js
+++ b/electron/main/renderer.js
@@ -16,15 +16,21 @@ uploadContainer.addEventListener("drop", (e) => {
         e.preventDefault()
         const files = e.dataTransfer.files
         const filePath = window.explorer.onFileDrop(files[0])
-        var holdy = filePath + "";
-        if(holdy.endsWith(".mp4") || holdy.endsWith(".mov") || holdy.endsWith(".avi") || holdy.endsWith( ".mkv")){
-            console.log(filePath)
 
+        var holdy = String(filePath);
+        const lower = holdy.toLowerCase();
+        const validExt = [".mp4", ".mov", ".avi", ".mkv"];
+        
+       if(validExt.some(ext => lower.endsWith(ext))){
+            console.log(filePath);
             const files1 = e.dataTransfer.files;
             handleFiles(files1);
+        }else{
+            console.log('Video format invalid!');
         }
     } catch (error) {
         console.log("Error in renderer.js with the listerner for the drop function");
+        console.log(error);
     }
     
     
diff --git a/electron/main/script.js b/electron/main/script.js
index b947cdb..fac9960 100644
--- a/electron/main/script.js
+++ b/electron/main/script.js
@@ -6,7 +6,7 @@ manualUploadBtn.addEventListener('click', () => {
   } catch (error) {
     console.log("Error in manualBtn EventListener click");
   }
-  
+
 });
 
 //function to check if one checkbox is at least klicked
@@ -15,18 +15,24 @@ function checkBoxes() {
     const checkboxes = document.querySelectorAll('input[name="docFormat"]');
     let isChecked = false;
 
-    checkboxes.forEach(function(checkbox){
-      if(checkbox.checked){
+    checkboxes.forEach(function (checkbox) {
+      if (checkbox.checked) {
         isChecked = true;
       }
     });
 
-    if(isChecked){
+    if (isChecked) {
       //Code to submit the video
       var pathTest = window.electronAPI.getFilePath(videoUpload.files[0]);
-      if(pathTest.endsWith(".mp4") || holdy.endsWith(".mov") || holdy.endsWith(".avi") || holdy.endsWith( ".mkv")){
-        window.extractor.extract({inputVideoPath: pathTest, outputType:"wav"})
+
+      const lower = pathTest.toLowerCase();
+      const validExt = [".mp4", ".mov", ".avi", ".mkv"];
+
+      if(validExt.some(ext => lower.endsWith(ext))){
+        window.extractor.extract({ inputVideoPath: pathTest, outputType: "wav" });
       }
+
+
     } else {
       //language only english at the moment
       alert('Please select at least one document type.');
@@ -34,43 +40,43 @@ function checkBoxes() {
   } catch (error) {
     console.log(error)
   }
-  
-// mapFunctions.get("extraction-video-to-audio").function({inputVideoPath:"./a.mp4", outputType:"wav"})
+
+  // mapFunctions.get("extraction-video-to-audio").function({inputVideoPath:"./a.mp4", outputType:"wav"})
 }
 
 //language changing feature
 function changeLanguage(language) {
-    if (language === 'en') {
-        document.getElementById('title').textContent = 'Video to document';
-        document.getElementById('h1').textContent = 'Video to document';
-        document.getElementById('p1').textContent = 'Drag and drop video file';
-        document.getElementById('fileName').textContent = 'No video chosen';
-        document.getElementById('manualUploadBtn').textContent = 'Search video';
-        document.getElementById('checkbox_group').textContent = 'Choose prefered document style:';
-        document.getElementById('label_format').textContent = 'Meeting report';
-        document.getElementById('label_summary').textContent = 'Summary with timestamps';
-        document.getElementById('submitButton').textContent = 'Submit';
-    } else if (language === 'de') {
-        document.getElementById('title').textContent = 'Video zu Dokument';
-        document.getElementById('h1').textContent = 'Video zu Dokument';
-        document.getElementById('p1').textContent = 'Video per Drag & Drop ablegen';
-        document.getElementById('fileName').textContent = 'Kein Video ausgewaehlt';
-        document.getElementById('manualUploadBtn').textContent = 'Video suchen';
-        document.getElementById('checkbox_group').textContent = 'Bevorzugte Dokumentvarianten:';
-        document.getElementById('label_format').textContent = 'Meeting Bericht';
-        document.getElementById('label_summary').textContent = 'Zusammenfassung mit Zeitstempeln';
-        document.getElementById('submitButton').textContent = 'Absenden';
-    } else if(language == "in") {
-        document.getElementById('title').textContent = 'दस्तावेज़ के लिए वीडियो';
-        document.getElementById('h1').textContent = 'दस्तावेज़ के लिए वीडियो';
-        document.getElementById('p1').textContent = 'वीडियो फ़ाइल खींचें और छोड़ें';
-        document.getElementById('fileName').textContent = 'कोई वीडियो नहीं चुना गया';
-        document.getElementById('manualUploadBtn').textContent = 'वीडियो खोजें';
-        document.getElementById('checkbox_group').textContent = 'पसंदीदा दस्तावेज़ शैली चुनें:';
-        document.getElementById('label_format').textContent = 'बैठक रिपोर्ट';
-        document.getElementById('label_summary').textContent = 'टाइमस्टैम्प के साथ सारांश';
-        document.getElementById('submitButton').textContent = 'जमा करना';
-    }
+  if (language === 'en') {
+    document.getElementById('title').textContent = 'Video to document';
+    document.getElementById('h1').textContent = 'Video to document';
+    document.getElementById('p1').textContent = 'Drag and drop video file';
+    document.getElementById('fileName').textContent = 'No video chosen';
+    document.getElementById('manualUploadBtn').textContent = 'Search video';
+    document.getElementById('checkbox_group').textContent = 'Choose prefered document style:';
+    document.getElementById('label_format').textContent = 'Meeting report';
+    document.getElementById('label_summary').textContent = 'Summary with timestamps';
+    document.getElementById('submitButton').textContent = 'Submit';
+  } else if (language === 'de') {
+    document.getElementById('title').textContent = 'Video zu Dokument';
+    document.getElementById('h1').textContent = 'Video zu Dokument';
+    document.getElementById('p1').textContent = 'Video per Drag & Drop ablegen';
+    document.getElementById('fileName').textContent = 'Kein Video ausgewaehlt';
+    document.getElementById('manualUploadBtn').textContent = 'Video suchen';
+    document.getElementById('checkbox_group').textContent = 'Bevorzugte Dokumentvarianten:';
+    document.getElementById('label_format').textContent = 'Meeting Bericht';
+    document.getElementById('label_summary').textContent = 'Zusammenfassung mit Zeitstempeln';
+    document.getElementById('submitButton').textContent = 'Absenden';
+  } else if (language == "in") {
+    document.getElementById('title').textContent = 'दस्तावेज़ के लिए वीडियो';
+    document.getElementById('h1').textContent = 'दस्तावेज़ के लिए वीडियो';
+    document.getElementById('p1').textContent = 'वीडियो फ़ाइल खींचें और छोड़ें';
+    document.getElementById('fileName').textContent = 'कोई वीडियो नहीं चुना गया';
+    document.getElementById('manualUploadBtn').textContent = 'वीडियो खोजें';
+    document.getElementById('checkbox_group').textContent = 'पसंदीदा दस्तावेज़ शैली चुनें:';
+    document.getElementById('label_format').textContent = 'बैठक रिपोर्ट';
+    document.getElementById('label_summary').textContent = 'टाइमस्टैम्प के साथ सारांश';
+    document.getElementById('submitButton').textContent = 'जमा करना';
+  }
 }
 
 
@@ -81,7 +87,7 @@ videoUpload.addEventListener('change', () => {
   } catch (error) {
     console.log("Error in manualBtn EventListener change");
   }
-  
+
 });
 
 
@@ -99,11 +105,11 @@ function handleFiles(files) {
   } catch (error) {
     console.log("Error in script.js handleFiles function");
   }
-  
+
 }
 
 //function to regulate the progress on the progressbar
-function updateProgressBar(bar, value){
+function updateProgressBar(bar, value) {
   try {
     value = Math.round(value);
     bar.querySelector(".progress_fill").style.width = `${value}%`;
@@ -111,5 +117,5 @@ function updateProgressBar(bar, value){
   } catch (error) {
     console.log("Error in scripts.js updateProgressBar function");
   }
-  
+
 }
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