diff --git a/bin/browser.cjs b/bin/browser.cjs
index b33f52c..d340150 100644
--- a/bin/browser.cjs
+++ b/bin/browser.cjs
@@ -49,7 +49,9 @@ const getOutput = async (request, page = null) => {
             const result = await page[request.action](request.options);
 
             // Ignore output result when saving to a file
-            output.result = request.options.path ? '' : result.toString('base64');
+            output.result = request.options.path
+                ? ''
+                : (result instanceof Uint8Array ? Buffer.from(result) : result).toString('base64');
         }
     }
 
diff --git a/tests/PdfTest.php b/tests/PdfTest.php
index 03c06b6..468ab73 100644
--- a/tests/PdfTest.php
+++ b/tests/PdfTest.php
@@ -64,6 +64,7 @@
         ->base64pdf();
 
     expect(is_string($base64))->toBeTrue();
+    expect(base64_decode($base64, true))->toBeString();
 });
 
 it('can write options to a file and generate a pdf', function () {