diff --git a/config/config.sample.php b/config/config.sample.php
index 870d09e24a7..366b6fbbc75 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -1227,6 +1227,11 @@ $CONFIG = [
  */
 'preview_imaginary_url' => 'http://previews_hpb:8088/',
 
+/**
+ * If you want set a api key for imaginary.
+ */
+'preview_imaginary_key' => 'secret',
+
 /**
  * Only register providers that have been explicitly enabled
  *
diff --git a/lib/private/Preview/Imaginary.php b/lib/private/Preview/Imaginary.php
index ed8b9eaa838..74f04e09250 100644
--- a/lib/private/Preview/Imaginary.php
+++ b/lib/private/Preview/Imaginary.php
@@ -136,9 +136,10 @@ class Imaginary extends ProviderV2 {
 		];
 
 		try {
+			$imaginaryKey = $this->config->getSystemValueString('preview_imaginary_key', '');
 			$response = $httpClient->post(
 				$imaginaryUrl . '/pipeline', [
-					'query' => ['operations' => json_encode($operations)],
+					'query' => ['operations' => json_encode($operations), 'key' => $imaginaryKey],
 					'stream' => true,
 					'content-type' => $file->getMimeType(),
 					'body' => $stream,