diff --git a/Readme.md b/Readme.md
index 2eaa1ea..861a2ca 100644
--- a/Readme.md
+++ b/Readme.md
@@ -58,7 +58,8 @@ $renderer->setForegroundColor($colorRed);
 file_put_contents('barcode.png', $renderer->render($barcode, 3, 50));
 ```
 
-## Image types
+## Image renderers
+These are the available renderers:
 ```php
 $renderer = new Picqer\Barcode\Renderers\SvgRenderer(); // Vector based SVG
 $renderer = new Picqer\Barcode\Renderers\PngRenderer(); // Pixel based PNG
@@ -67,6 +68,51 @@ $renderer = new Picqer\Barcode\Renderers\HtmlRenderer(); // Pixel based HTML
 $renderer = new Picqer\Barcode\Renderers\DynamicHtmlRenderer(); // Vector based HTML (full 'page' width and height)
 ```
 
+Each renderer has their own options. Only the barcode is required, the rest is optional. Here are all the options for each renderers:
+
+### SVG
+```php
+$renderer = new Picqer\Barcode\Renderers\SvgRenderer();
+$renderer->setForegroundColor('red'); // Give a color for the bars, the background is always white
+$renderer->setSvgType($renderer::TYPE_SVG_INLINE); // Changes the output to be used inline inside HTML documents, instead of a standalone SVG image (default)
+$renderer->setSvgType($renderer::TYPE_SVG_STANDALONE); // If you want to force the default, create a stand alone SVG image
+
+$renderer->render($barcode, 450.20, 75); // Width and height support floats
+````
+
+### PNG + JPG
+All options for PNG and JPG are the same.
+```php
+$renderer = new Picqer\Barcode\Renderers\PngRenderer();
+$renderer->setForegroundColor([255, 0, 0]); // Give a color for the bars, the background is always white. Give it as 3 times 0-255 values for red, green and blue. 
+$renderer->useGd(); // If you have Imagick and GD installed, but want to use GD
+$renderer->useImagick(); // If you have Imagick and GD installed, but want to use Imagick
+$renderer->render($barcode, 5, 40); // Width factor (how many pixel wide every bar is), and the height in pixels
+````
+
+### HTML
+Gives HTML to use inline in a full HTML document.
+```php
+$renderer = new Picqer\Barcode\Renderers\HtmlRenderer();
+$renderer->setForegroundColor('red'); // Give a color for the bars, the background is always white
+
+$renderer->render($barcode, 450.20, 75); // Width and height support floats
+````
+
+### Dynamic HTML
+Give HTML here the barcode is using the full width and height, to put inside a container/div that has a fixed size.
+```php
+$renderer = new Picqer\Barcode\Renderers\DynamicHtmlRenderer();
+$renderer->setForegroundColor('red'); // Give a color for the bars, the background is always white
+
+$renderer->render($barcode);
+````
+
+You can put the rendered HTML inside a div like this:
+```html
+<div style="width: 400px; height: 75px"><?php echo $renderedBarcode; ?></div>
+```
+
 ## Accepted barcode types
 These barcode types are supported. All types support different character sets and some have mandatory lengths. Please see wikipedia for supported chars and lengths per type.
 
diff --git a/src/Renderers/JpgRenderer.php b/src/Renderers/JpgRenderer.php
index 30a6b6e..132ec10 100644
--- a/src/Renderers/JpgRenderer.php
+++ b/src/Renderers/JpgRenderer.php
@@ -14,7 +14,7 @@ protected function createImagickImageObject(int $width, int $height): Imagick
         return $image;
     }
 
-    protected function generateGdImage($image)
+    protected function generateGdImage($image): void
     {
         \imagejpeg($image);
         \imagedestroy($image);
diff --git a/src/Renderers/PngRenderer.php b/src/Renderers/PngRenderer.php
index 59c8269..22cfcc8 100644
--- a/src/Renderers/PngRenderer.php
+++ b/src/Renderers/PngRenderer.php
@@ -32,7 +32,7 @@ public function __construct()
     /**
      * Force the use of Imagick image extension
      */
-    public function useImagick()
+    public function useImagick(): void
     {
         $this->useImagick = true;
     }
@@ -40,7 +40,7 @@ public function useImagick()
     /**
      * Force the use of the GD image library
      */
-    public function useGd()
+    public function useGd(): void
     {
         $this->useImagick = false;
     }
@@ -81,14 +81,14 @@ public function render(Barcode $barcode, int $widthFactor = 2, int $height = 30)
             $image = $this->createImagickImageObject($width, $height);
             $image->drawImage($imagickBarsShape);
             return $image->getImageBlob();
+        } else {
+            ob_start();
+            $this->generateGdImage($image);
+            return ob_get_clean();
         }
-
-        ob_start();
-        $this->generateGdImage($image);
-        return ob_get_clean();
     }
 
-    public function setForegroundColor(array $color)
+    public function setForegroundColor(array $color): void
     {
         $this->foregroundColor = $color;
     }
@@ -110,7 +110,7 @@ protected function createImagickImageObject(int $width, int $height): Imagick
         return $image;
     }
 
-    protected function generateGdImage($image)
+    protected function generateGdImage($image): void
     {
         \imagepng($image);
         \imagedestroy($image);