diff --git a/source/fpdf.pas b/source/fpdf.pas
index a3dc61c..f7679a4 100644
--- a/source/fpdf.pas
+++ b/source/fpdf.pas
@@ -437,7 +437,7 @@   TFPDF = class
    (000, 000, 128), (000, 000, 255), (000, 128, 128), (000, 255, 255),
    (220, 220, 220) );
 
-function SwapBytes(Value: LongWord): LongWord; overload;
+function SwapBytes(Value: Cardinal): Cardinal; overload;
 function SwapBytes(Value: Word): Word; overload;
 function Split(const AString: string; const ADelimiter: Char = ' '): TStringArray;
 function CountStr(const AString, SubStr : String ) : Integer ;
@@ -3560,7 +3560,7 @@ function TFPDF.GzDecompress(const StrIn: AnsiString): AnsiString;
   end;
 end;
 
-function SwapBytes(Value: LongWord): LongWord;
+function SwapBytes(Value: Cardinal): Cardinal;
 type
   Bytes = packed array[0..3] of Byte;
 begin
diff --git a/source/fpdf_ext.pas b/source/fpdf_ext.pas
index 5d56adc..6f509b1 100644
--- a/source/fpdf_ext.pas
+++ b/source/fpdf_ext.pas
@@ -317,8 +317,10 @@   TFPDFExt = class(TFPDF)
       BarHeight: double = 0; BarWidth: double = 0);
 
     {$IfDef DelphiZXingQRCode}
-    procedure QRCode(vX: double; vY: double; const QRCodeData: String;
-      DotSize: Double = 0; AEncoding: TQRCodeEncoding = qrAuto);
+    function QRCode(vX: double; vY: double; const QRCodeData: String;
+      DotSize: Double = 0; AEncoding: TQRCodeEncoding = qrAuto): double; overload;
+    procedure QRCode(vX: double; vY: double; vQRCodeSize: double;
+      const QRCodeData: String; AEncoding: TQRCodeEncoding = qrAuto); overload;
     {$EndIf}
     procedure Draw2DMatrix(AMatrix: TFPDF2DMatrix; vX: double; vY: double;
       DotSize: Double = 0);
@@ -1528,8 +1530,27 @@ procedure TFPDFExt.Code128(const ABarCode: string; vX: double; vY: double;
 end;
 
 {$IfDef DelphiZXingQRCode}
-procedure TFPDFExt.QRCode(vX: double; vY: double; const QRCodeData: String;
-  DotSize: Double; AEncoding: TQRCodeEncoding);
+procedure TFPDFExt.QRCode(vX, vY, vQRCodeSize: double; const QRCodeData: String;
+  AEncoding: TQRCodeEncoding);
+var
+  qr: TDelphiZXingQRCode;
+  DotSize: double;
+begin
+  qr := TDelphiZXingQRCode.Create;
+  try
+    qr.Encoding  := AEncoding;
+    qr.QuietZone := 1;
+    qr.Data := widestring(QRCodeData);
+    DotSize := vQRCodeSize / qr.Rows;
+  finally
+    qr.Free;
+  end;
+
+  QRCode(vX, vY, QRCodeData, DotSize, AEncoding);
+end;
+
+function TFPDFExt.QRCode(vX: double; vY: double; const QRCodeData: String;
+  DotSize: Double; AEncoding: TQRCodeEncoding): double;
 var
   qr: TDelphiZXingQRCode;
   PDF2DMatrix: TFPDF2DMatrix;
@@ -1553,6 +1574,8 @@ procedure TFPDFExt.QRCode(vX: double; vY: double; const QRCodeData: String;
           PDF2DMatrix[r][c] := 0;
       end;
     end;
+
+    Result := qr.Rows * DotSize;
   finally
     qr.Free;
   end;