diff --git a/examples/QRImageWithLogo.php b/examples/QRImageWithLogo.php
index 76aa5ced7..76f9e40ec 100644
--- a/examples/QRImageWithLogo.php
+++ b/examples/QRImageWithLogo.php
@@ -72,7 +72,7 @@ class QRImageWithLogo extends QRImage{
 		}
 
 		if($this->options->imageBase64){
-			$imageData = 'data:image/'.$this->options->outputType.';base64,'.base64_encode($imageData);
+			$imageData = $this->base64encode($imageData, 'image/'.$this->options->outputType);
 		}
 
 		return $imageData;
diff --git a/examples/QRImageWithText.php b/examples/QRImageWithText.php
index fe6b962a9..e3b2d8c62 100644
--- a/examples/QRImageWithText.php
+++ b/examples/QRImageWithText.php
@@ -20,7 +20,7 @@ namespace chillerlan\QRCodeExamples;
 
 use chillerlan\QRCode\Output\QRImage;
 
-use function base64_encode, imagechar, imagecolorallocate, imagecolortransparent, imagecopymerge, imagecreatetruecolor,
+use function imagechar, imagecolorallocate, imagecolortransparent, imagecopymerge, imagecreatetruecolor,
 	imagedestroy, imagefilledrectangle, imagefontwidth, in_array, round, str_split, strlen;
 
 class QRImageWithText extends QRImage{
@@ -50,7 +50,7 @@ class QRImageWithText extends QRImage{
 		}
 
 		if($this->options->imageBase64){
-			$imageData = 'data:image/'.$this->options->outputType.';base64,'.base64_encode($imageData);
+			$imageData = $this->base64encode($imageData, 'image/'.$this->options->outputType);
 		}
 
 		return $imageData;
diff --git a/src/Output/QRFpdf.php b/src/Output/QRFpdf.php
index 0f56dfeb9..1c3b99d4e 100644
--- a/src/Output/QRFpdf.php
+++ b/src/Output/QRFpdf.php
@@ -103,7 +103,7 @@ class QRFpdf extends QROutputAbstract{
 		}
 
 		if($this->options->imageBase64){
-			$pdfData = sprintf('data:application/pdf;base64,%s', base64_encode($pdfData));
+			$pdfData = $this->base64encode($pdfData, 'application/pdf');
 		}
 
 		return $pdfData;
diff --git a/src/Output/QRImage.php b/src/Output/QRImage.php
index 967b4cd13..098a7825d 100644
--- a/src/Output/QRImage.php
+++ b/src/Output/QRImage.php
@@ -19,9 +19,9 @@ use chillerlan\QRCode\{QRCode, QRCodeException};
 use chillerlan\Settings\SettingsContainerInterface;
 use Exception;
 
-use function array_values, base64_encode, call_user_func, count, extension_loaded, imagecolorallocate, imagecolortransparent,
+use function array_values, call_user_func, count, extension_loaded, imagecolorallocate, imagecolortransparent,
 	imagecreatetruecolor, imagedestroy, imagefilledrectangle, imagegif, imagejpeg, imagepng, in_array,
-	is_array, ob_end_clean, ob_get_contents, ob_start, range, sprintf;
+	is_array, ob_end_clean, ob_get_contents, ob_start, range;
 
 /**
  * Converts the matrix into GD images, raw or base64 output (requires ext-gd)
@@ -127,7 +127,7 @@ class QRImage extends QROutputAbstract{
 		}
 
 		if($this->options->imageBase64){
-			$imageData = sprintf('data:image/%s;base64,%s', $this->options->outputType, base64_encode($imageData));
+			$imageData = $this->base64encode($imageData, 'image/'.$this->options->outputType);
 		}
 
 		return $imageData;
diff --git a/src/Output/QRMarkup.php b/src/Output/QRMarkup.php
index 06d6e88cb..a351c8cf4 100644
--- a/src/Output/QRMarkup.php
+++ b/src/Output/QRMarkup.php
@@ -151,7 +151,7 @@ class QRMarkup extends QROutputAbstract{
 		}
 
 		if($this->options->imageBase64){
-			$svg = sprintf('data:image/svg+xml;base64,%s', base64_encode($svg));
+			$svg = $this->base64encode($svg, 'image/svg+xml');
 		}
 
 		return $svg;
diff --git a/src/Output/QROutputAbstract.php b/src/Output/QROutputAbstract.php
index d4ed3d0c9..a115cf722 100644
--- a/src/Output/QROutputAbstract.php
+++ b/src/Output/QROutputAbstract.php
@@ -14,8 +14,7 @@ namespace chillerlan\QRCode\Output;
 
 use chillerlan\QRCode\{Data\QRMatrix, QRCode};
 use chillerlan\Settings\SettingsContainerInterface;
-
-use function call_user_func_array, dirname, file_put_contents, get_called_class, in_array, is_writable, sprintf;
+use function base64_encode, call_user_func_array, dirname, file_put_contents, get_called_class, in_array, is_writable, sprintf;
 
 /**
  * common output abstract
@@ -92,6 +91,13 @@ abstract class QROutputAbstract implements QROutputInterface{
 	 */
 	abstract protected function setModuleValues():void;
 
+	/**
+	 * Returns a base64 data URI for the given string and mime type
+	 */
+	protected function base64encode(string $data, string $mime):string{
+		return sprintf('data:%s;base64,%s', $mime, base64_encode($data));
+	}
+
 	/**
 	 * saves the qr data to a file
 	 *