diff --git a/index.php b/index.php
index 921206e..52452ae 100644
--- a/index.php
+++ b/index.php
@@ -3,17 +3,41 @@
 @include_once __DIR__ . '/vendor/autoload.php';
 @include_once __DIR__ . '/src/webp.php';
 
+function shouldGenerateWebP($file) {
+    return $file->kirby()->option('kirby3-webp', false);
+}
+
+function generateWebP($file) {
+    (new WebP\Convert)->generateWebP($file);
+}
+
+function deleteWebPFiles($file) {
+    $webpFile = dirname($file->root()) . '/' . $file->name() . '.webp';
+    $webpTxtFile = dirname($file->root()) . '/' . $file->name() . '.webp.txt';
+    deleteIfExist($webpFile);
+    deleteIfExist($webpTxtFile);
+}
+
+function deleteIfExist($file) {
+    if (F::exists($file)) {
+        F::remove($file);
+    }
+}
+
 Kirby::plugin('felixhaeberle/kirby3-webp', [
     'hooks' => [
         'file.create:after' => function ($file) {
-            if ($this->option('kirby3-webp', false)) {
-                (new WebP\Convert)->generateWebP($file);
+            if (shouldGenerateWebP($file)) {
+                generateWebP($file);
             }
         },
         'file.replace:after' => function ($newFile, $oldFile) {
-            if ($this->option('kirby3-webp', false)) {
-                (new WebP\Convert)->generateWebP($newFile);
+            if (shouldGenerateWebP($newFile)) {
+                generateWebP($newFile);
             }
         },
+        'file.delete:after' => function ($file) {
+            deleteWebPFiles($file);
+        },
     ],
 ]);
diff --git a/lib/Convert.php b/lib/Convert.php
index 342fe0e..873c535 100644
--- a/lib/Convert.php
+++ b/lib/Convert.php
@@ -29,7 +29,7 @@ public function generateWebP($file)
     {
         try {
             // Checking file type since only images are processed
-            if ($file->type() == 'image') {
+            if (in_array($file->extension(), ['jpg', 'jpeg', 'png'])) {
                 // WebPConvert options
                 $path = $file->contentFileDirectory() . '/';
                 $input = $path . $file->filename();