diff --git a/src/Browsershot.php b/src/Browsershot.php
index d50ee04..9a7131d 100644
--- a/src/Browsershot.php
+++ b/src/Browsershot.php
@@ -878,6 +878,13 @@ public function createPdfCommand($targetPath = null): array
             $command['options']['scale'] = $this->scale;
         }
 
+        if ($this->additionalOptions['fullPage'] ?? false) {
+            $heightPx = $this->callBrowser($this->createCommand($url, 'evaluate', ['pageFunction' => 'document.body.scrollHeight']));
+            $widthPx = $this->callBrowser($this->createCommand($url, 'evaluate', ['pageFunction' => 'document.body.scrollWidth']));
+            $command['options']['height'] = $heightPx;
+            $command['options']['width'] = $widthPx;
+        }
+
         return $command;
     }