diff --git a/src/Plugin/ImageToolkit/Operation/imagemagick/TextToWrapper.php b/src/Plugin/ImageToolkit/Operation/imagemagick/TextToWrapper.php
index 261c102..82c2b94 100644
--- a/src/Plugin/ImageToolkit/Operation/imagemagick/TextToWrapper.php
+++ b/src/Plugin/ImageToolkit/Operation/imagemagick/TextToWrapper.php
@@ -29,14 +29,31 @@ class TextToWrapper extends ImagemagickImageToolkitOperationBase {
     $gd_wrapper->apply('text_to_wrapper', $arguments);
     // Flush the temporary wrapper to disk, reopen via ImageMagick and return.
     if ($gd_wrapper) {
-      $tmp_file = \Drupal::service('file_system')->tempnam('temporary://', 'image_effects_');
+      // Temporary file prefix is limited to 3 chars for Windows compatibility.
+      $tmp_file = \Drupal::service('file_system')->tempnam('temporary://', 'ifx');
       $gd_wrapper_destination = $tmp_file . '.png';
       file_unmanaged_move($tmp_file, $gd_wrapper_destination, FILE_CREATE_DIRECTORY);
       $gd_wrapper->save($gd_wrapper_destination);
       $tmp_wrapper = \Drupal::service('image.factory')->get($gd_wrapper_destination, 'imagemagick');
+      // Remove temporary files after they've been processed
+      register_shutdown_function([
+        '\Drupal\image_effects\Plugin\ImageToolkit\Operation\imagemagick\TextToWrapper',
+        'delete',
+      ], $gd_wrapper_destination);
       return $this->getToolkit()->apply('replace_image', ['replacement_image' => $tmp_wrapper]);
     }
     return FALSE;
   }
 
+  /**
+   * Delete the image effect temporary file after it's been used
+   *
+   * @param string $file_path
+   *   Path of the file that's about to be deleted
+   */
+  public static function delete($file_path) {
+    if (file_exists($file_path)) {
+      file_unmanaged_delete($file_path);
+    }
+  }
 }
diff --git a/tests/src/Functional/Effect/TextOverlayTest.php b/tests/src/Functional/Effect/TextOverlayTest.php
index 6e6dfbc..c7a84d8 100644
--- a/tests/src/Functional/Effect/TextOverlayTest.php
+++ b/tests/src/Functional/Effect/TextOverlayTest.php
@@ -91,6 +91,12 @@ class TextOverlayTest extends ImageEffectsTestBase {
     ];
     $this->addEffectToTestStyle($effect_config);
 
+    // Check that no temporary files are left in Imagemagick.
+    if ($toolkit_id === 'imagemagick') {
+      $directory_scan = file_scan_directory('temporary://', '/ifx.*/');
+      $this->assertEquals(0, count($directory_scan));
+    }
+
     $test_data = [
       [
         'test_file' => $this->getTestImageCopyUri('/files/image-test.png', 'simpletest'),