diff --git a/RSBarcodes/RSCodeGenerator.h b/RSBarcodes/RSCodeGenerator.h
index f8ce3b6..6a7cbbb 100644
--- a/RSBarcodes/RSCodeGenerator.h
+++ b/RSBarcodes/RSCodeGenerator.h
@@ -18,10 +18,10 @@
 @required
 
 - (UIImage *)genCodeWithMachineReadableCodeObject:
-(AVMetadataMachineReadableCodeObject *)machineReadableCodeObject;
+(AVMetadataMachineReadableCodeObject *)machineReadableCodeObject withWidth:(CGFloat)width withHeight:(CGFloat)height;
 
 - (UIImage *)genCodeWithContents:(NSString *)contents
-   machineReadableCodeObjectType:(NSString *)type;
+   machineReadableCodeObjectType:(NSString *)type withWidth:(CGFloat)width withHeight:(CGFloat)height;
 
 /** The fill (background) color of the generated barcode. */
 @property (nonatomic, strong) UIColor *fillColor;
@@ -98,7 +98,7 @@ extern NSString *const DIGITS_STRING;
  *
  *  @return Encoded image.
  */
-- (UIImage *)drawCompleteBarcode:(NSString *)code;
+- (UIImage *)drawCompleteBarcode:(NSString *)code withWidth:(CGFloat)width withHeight:(CGFloat)height;
 
 @end
 
diff --git a/RSBarcodes/RSCodeGenerator.m b/RSBarcodes/RSCodeGenerator.m
index c04345e..389aced 100644
--- a/RSBarcodes/RSCodeGenerator.m
+++ b/RSBarcodes/RSCodeGenerator.m
@@ -14,6 +14,14 @@ @implementation RSAbstractCodeGenerator
 
 NSString *const DIGITS_STRING = @"0123456789";
 
+CGFloat const WIDTH_REF = 90.f; 
+CGFloat const HEIGHT_REF = 28.f; 
+ 
+CGFloat const TOP_SPACING_REF = 1.5f; 
+CGFloat const BOTTOM_SPACING_REF = 2.f; 
+CGFloat const SIDE_SPACING_REF = 2.f; 
+CGFloat fixRatio = 0.8;
+
 - (BOOL)isContentsValid:(NSString *)contents {
     if (contents.length > 0) {
         for (int i = 0; i < contents.length; i++) {
@@ -45,7 +53,7 @@ - (NSString *)completeBarcode:(NSString *)barcode {
             stringWithFormat:@"%@%@%@", [self initiator], barcode, [self terminator]];
 }
 
-- (UIImage *)drawCompleteBarcode:(NSString *)code {
+- (UIImage *)drawCompleteBarcode:(NSString *)code withWidth:(CGFloat)width withHeight:(CGFloat)height {
     if (code.length <= 0) {
         return nil;
     }
@@ -55,9 +63,14 @@ - (UIImage *)drawCompleteBarcode:(NSString *)code {
     // Top spacing          = 1.5
     // Bottom spacing       = 2
     // Left & right spacing = 2
-    // Height               = 28
-    CGSize size = CGSizeMake(code.length + 4, 28);
-    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
+    // Height               = 28        = 112 
+    // Width = 90 ==> lineWith 1 
+     
+    CGFloat widthRatio = width / WIDTH_REF; 
+    CGFloat heightRatio = height / HEIGHT_REF; 
+ 
+    CGSize size = CGSizeMake(width, height); 
+    UIGraphicsBeginImageContextWithOptions(size, NO, UIScreen.mainScreen.scale);
     CGContextRef context = UIGraphicsGetCurrentContext();
     
     CGContextSetShouldAntialias(context, false);
@@ -74,14 +87,13 @@ - (UIImage *)drawCompleteBarcode:(NSString *)code {
     [self.strokeColor setStroke];
     
     CGContextFillRect(context, CGRectMake(0, 0, size.width, size.height));
-    CGContextSetLineWidth(context, 1);
+    CGContextSetLineWidth(context, widthRatio * fixRatio);
     
     for (int i = 0; i < code.length; i++) {
         NSString *character = [code substringWithRange:NSMakeRange(i, 1)];
         if ([character isEqualToString:@"1"]) {
-            CGContextMoveToPoint(context, i + (2 + 1), 1.5);
-            CGContextAddLineToPoint(context, i + (2 + 1), size.height - 2);
-        }
+            CGContextMoveToPoint(context, ((i + (SIDE_SPACING_REF * heightRatio + widthRatio)) * widthRatio) * fixRatio, TOP_SPACING_REF * heightRatio);
+            CGContextAddLineToPoint(context, ((i + (SIDE_SPACING_REF * heightRatio + widthRatio)) * widthRatio) * fixRatio , size.height - BOTTOM_SPACING_REF * heightRatio);        }
     }
     CGContextDrawPath(context, kCGPathFillStroke);
     
@@ -95,19 +107,15 @@ - (UIImage *)drawCompleteBarcode:(NSString *)code {
 #pragma mark - RSCodeGenerator
 
 - (UIImage *)genCodeWithContents:(NSString *)contents
-   machineReadableCodeObjectType:(NSString *)type {
-    if ([self isContentsValid:contents]) {
-        return [self
-                drawCompleteBarcode:[self completeBarcode:[self barcode:contents]]];
-    }
-    return nil;
+   machineReadableCodeObjectType:(NSString *)type withWidth:(CGFloat)width withHeight:(CGFloat)height {
+    return [self drawCompleteBarcode:[self completeBarcode:[self barcode:contents]] withWidth:width withHeight:height];
 }
 
 - (UIImage *)genCodeWithMachineReadableCodeObject:
 (AVMetadataMachineReadableCodeObject *)
-machineReadableCodeObject {
+machineReadableCodeObject withWidth:(CGFloat)width withHeight:(CGFloat)height { 
     return [self genCodeWithContents:[machineReadableCodeObject stringValue]
-       machineReadableCodeObjectType:[machineReadableCodeObject type]];
+       machineReadableCodeObjectType:[machineReadableCodeObject type] withWidth:width withHeight:height];
 }
 
 @end
diff --git a/RSBarcodes/RSUnifiedCodeGenerator.m b/RSBarcodes/RSUnifiedCodeGenerator.m
index 2b5b8ef..9969055 100644
--- a/RSBarcodes/RSUnifiedCodeGenerator.m
+++ b/RSBarcodes/RSUnifiedCodeGenerator.m
@@ -68,7 +68,7 @@ + (instancetype)codeGen {
 #pragma mark - RSCodeGenerator
 
 - (UIImage *)genCodeWithContents:(NSString *)contents
-   machineReadableCodeObjectType:(NSString *)type {
+   machineReadableCodeObjectType:(NSString *)type withWidth:(CGFloat)width withHeight:(CGFloat)height {
     if ([type isEqualToString:AVMetadataObjectTypeQRCode] ||
         [type isEqualToString:AVMetadataObjectTypePDF417Code] ||
         [type isEqualToString:AVMetadataObjectTypeAztecCode]) {
@@ -123,7 +123,7 @@ - (UIImage *)genCodeWithContents:(NSString *)contents
         codeGen.strokeColor = self.strokeColor;
         
         return [codeGen genCodeWithContents:contents
-              machineReadableCodeObjectType:type];
+              machineReadableCodeObjectType:type withWidth:width withHeight:height];
     } else {
         return nil;
     }
@@ -131,9 +131,9 @@ - (UIImage *)genCodeWithContents:(NSString *)contents
 
 - (UIImage *)genCodeWithMachineReadableCodeObject:
 (AVMetadataMachineReadableCodeObject *)
-machineReadableCodeObject {
+machineReadableCodeObject withWidth:(CGFloat)width withHeight:(CGFloat)height {
     return [self genCodeWithContents:[machineReadableCodeObject stringValue]
-       machineReadableCodeObjectType:[machineReadableCodeObject type]];
+       machineReadableCodeObjectType:[machineReadableCodeObject type] withWidth:width withHeight:height]; 
 }
 
 @end