diff --git a/README.md b/README.md
index 9b43fa8..4426ab2 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,9 @@ standalone      - whether to make this a full SVG file, or only an svg to embed
 use_path        - Use <path> to render SVG rather than <rect> to significantly reduce size
                   and quality. This will become the default in future versions.
                   (default false)
+viewbox         - replace the `svg.width` and `svg.height` attribute with `svg.viewBox` to
+                  allow CSS scaling
+                  (default false)
 ```
 Example
 ```ruby
@@ -104,11 +107,11 @@ qrcode = RQRCode::QRCode.new("http://github.com/")
 
 # NOTE: showing with default options specified explicitly
 svg = qrcode.as_svg(
-  offset: 0,
   color: '000',
   shape_rendering: 'crispEdges',
   module_size: 11,
-  standalone: true
+  standalone: true,
+  use_path: true
 )
 ```
 
diff --git a/lib/rqrcode/export/svg.rb b/lib/rqrcode/export/svg.rb
index 4576adc..78b9f59 100644
--- a/lib/rqrcode/export/svg.rb
+++ b/lib/rqrcode/export/svg.rb
@@ -143,27 +143,33 @@ def end_y
       # use_path        - Use <path> to render SVG rather than <rect> to significantly reduce size
       #                   and quality. This will become the default in future versions.
       #                   (default false)
+      # viewbox         - replace `width` and `height` in <svg> with a viewBox, allows CSS scaling
+      #                   (default false)
       #
       def as_svg(options = {})
+        fill = options[:fill]
         use_path = options[:use_path]
         offset = options[:offset].to_i || 0
         color = options[:color] || "000"
         shape_rendering = options[:shape_rendering] || "crispEdges"
         module_size = options[:module_size] || 11
         standalone = options[:standalone].nil? ? true : options[:standalone]
+        viewbox = options[:viewbox].nil? ? false : options[:viewbox]
 
         # height and width dependent on offset and QR complexity
         dimension = (@qrcode.module_count * module_size) + (2 * offset)
+        # use dimensions differently if we are using a viewBox
+        dimensions_attr = viewbox ? %(viewBox="0 0 #{dimension} #{dimension}") : %(width="#{dimension}" height="#{dimension}")
 
         xml_tag = %(<?xml version="1.0" standalone="yes"?>)
-        open_tag = %(<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ev="http://www.w3.org/2001/xml-events" width="#{dimension}" height="#{dimension}" shape-rendering="#{shape_rendering}">)
+        open_tag = %(<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ev="http://www.w3.org/2001/xml-events" #{dimensions_attr} shape-rendering="#{shape_rendering}">)
         close_tag = "</svg>"
 
         output_tag = (use_path ? Path : Rect).new(@qrcode)
         output_tag.build(module_size, offset, color)
 
-        if options[:fill]
-          output_tag.result.unshift %(<rect width="#{dimension}" height="#{dimension}" x="0" y="0" style="fill:##{options[:fill]}"/>)
+        if fill
+          output_tag.result.unshift %(<rect width="#{dimension}" height="#{dimension}" x="0" y="0" style="fill:##{fill}"/>)
         end
 
         if standalone
diff --git a/spec/rqrcode/data.rb b/spec/rqrcode/data.rb
index 39f95d6..130da00 100644
--- a/spec/rqrcode/data.rb
+++ b/spec/rqrcode/data.rb
@@ -18,6 +18,10 @@
   <path d="M0 0h7v7h-7zM8 0h7v2h-1v1h1v1h-2v-2h-1v-1h-2v2h-2v-1h1v-1h-1zM17 0h3v2h1v5h-1v-2h-1v2h-1v-3h-2v-1h2v1h1v-2h-1v-1h-1zM22 0h7v7h-7zM1 1v5h5v-5zM23 1v5h5v-5zM2 2h3v3h-3zM11 2h1v1h-1zM24 2h3v3h-3zM8 4h1v1h-1zM10 4h1v1h1v1h-1v1h-1v-1h-1v-1h1zM13 5h1v1h-1zM15 5h2v2h-1v-1h-1zM8 6h1v1h1v1h2v-2h1v1h1v-1h1v1h-1v1h-2v1h-3v-1h-1zM15 7h1v1h1v1h-1v3h1v-1h1v-1h1v1h-1v2h-1v1h1v1h-2v-2h-1v-1h-1v1h-1v-2h1v-1h1v-1h-1v-1h1zM5 8h2v1h-1v1h2v1h-2v1h1v1h-1v1h-2v-1h1v-2h-1v-1h-1v4h-1v-2h-1v1h-1v-3h1v-1h4zM18 8h3v1h1v-1h1v2h1v-2h1v2h1v-2h1v1h1v-1h1v1h-1v1h-1v1h-1v3h-2v-1h1v-1h-1v-1h-1v3h1v1h-2v-2h-1v-1h1v-1h-2v-2h-2zM12 9h1v1h-1zM1 10v1h1v-1zM10 10h2v2h-1v2h1v1h1v-1h1v-1h1v1h-1v1h1v1h1v2h2v-1h1v-2h1v-1h-1v-2h1v1h1v3h-1v1h-1v2h-3v1h2v1h-3v-1h-1v-2h-1v1h-1v-3h-2v1h-1v-1h-1v1h-2v1h3v1h1v1h-1v1h1v1h2v-2h-1v-1h1v1h1v1h1v1h-1v1h1v-1h1v1h1v1h-1v1h-3v-1h-1v-1h-1v2h1v1h2v2h-1v-1h-2v-1h-1v-2h-1v-1h1v-1h-1v-2h-1v-1h-2v-1h-1v-1h1v-2h1v-1h1v-1h1v-2h1v1h1zM27 12h1v1h-1zM9 13v1h1v-1zM28 13h1v1h-1zM0 14h2v1h1v-1h1v2h-1v1h-1v1h1v1h2v1h-2v1h-1v-2h-1v2h-1zM7 14v1h-1v1h1v-1h1v-1zM24 15h3v3h-2v-1h-1zM22 16h1v1h-1zM28 16h1v3h-1zM14 17v1h1v-1zM20 17h1v2h2v-2h1v3h1v-1h1v1h-1v1h1v-1h2v1h-1v1h-2v1h1v1h-1v1h-1v1h1v-1h3v2h-1v-1h-1v1h-1v2h-1v-2h-1v1h-1v-1h-1v1h-2v-1h-1v-1h-3v-1h1v-1h1v-1h2v-1h-1v-1h1v-2h1zM5 20h2v1h-2zM19 21v1h1v-1zM21 21v3h3v-3zM0 22h7v7h-7zM22 22h1v1h-1zM27 22h1v1h-1zM1 23v5h5v-5zM28 23h1v1h-1zM2 24h3v3h-3zM17 24v1h1v-1zM21 25v1h2v-1zM14 26h1v1h1v1h1v1h-3zM9 27h1v1h-1zM26 27h1v1h-1zM28 27h1v1h-1z" style="fill:#000" transform="translate(0,0) scale(11)"/>
 SVG
 
+AS_SVG4 = <<~SVG.chomp
+  <?xml version="1.0" standalone="yes"?><svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ev="http://www.w3.org/2001/xml-events" viewBox="0 0 319 319" shape-rendering="crispEdges"><path d="M0 0h7v7h-7zM8 0h7v2h-1v1h1v1h-2v-2h-1v-1h-2v2h-2v-1h1v-1h-1zM17 0h3v2h1v5h-1v-2h-1v2h-1v-3h-2v-1h2v1h1v-2h-1v-1h-1zM22 0h7v7h-7zM1 1v5h5v-5zM23 1v5h5v-5zM2 2h3v3h-3zM11 2h1v1h-1zM24 2h3v3h-3zM8 4h1v1h-1zM10 4h1v1h1v1h-1v1h-1v-1h-1v-1h1zM13 5h1v1h-1zM15 5h2v2h-1v-1h-1zM8 6h1v1h1v1h2v-2h1v1h1v-1h1v1h-1v1h-2v1h-3v-1h-1zM15 7h1v1h1v1h-1v3h1v-1h1v-1h1v1h-1v2h-1v1h1v1h-2v-2h-1v-1h-1v1h-1v-2h1v-1h1v-1h-1v-1h1zM5 8h2v1h-1v1h2v1h-2v1h1v1h-1v1h-2v-1h1v-2h-1v-1h-1v4h-1v-2h-1v1h-1v-3h1v-1h4zM18 8h3v1h1v-1h1v2h1v-2h1v2h1v-2h1v1h1v-1h1v1h-1v1h-1v1h-1v3h-2v-1h1v-1h-1v-1h-1v3h1v1h-2v-2h-1v-1h1v-1h-2v-2h-2zM12 9h1v1h-1zM1 10v1h1v-1zM10 10h2v2h-1v2h1v1h1v-1h1v-1h1v1h-1v1h1v1h1v2h2v-1h1v-2h1v-1h-1v-2h1v1h1v3h-1v1h-1v2h-3v1h2v1h-3v-1h-1v-2h-1v1h-1v-3h-2v1h-1v-1h-1v1h-2v1h3v1h1v1h-1v1h1v1h2v-2h-1v-1h1v1h1v1h1v1h-1v1h1v-1h1v1h1v1h-1v1h-3v-1h-1v-1h-1v2h1v1h2v2h-1v-1h-2v-1h-1v-2h-1v-1h1v-1h-1v-2h-1v-1h-2v-1h-1v-1h1v-2h1v-1h1v-1h1v-2h1v1h1zM27 12h1v1h-1zM9 13v1h1v-1zM28 13h1v1h-1zM0 14h2v1h1v-1h1v2h-1v1h-1v1h1v1h2v1h-2v1h-1v-2h-1v2h-1zM7 14v1h-1v1h1v-1h1v-1zM24 15h3v3h-2v-1h-1zM22 16h1v1h-1zM28 16h1v3h-1zM14 17v1h1v-1zM20 17h1v2h2v-2h1v3h1v-1h1v1h-1v1h1v-1h2v1h-1v1h-2v1h1v1h-1v1h-1v1h1v-1h3v2h-1v-1h-1v1h-1v2h-1v-2h-1v1h-1v-1h-1v1h-2v-1h-1v-1h-3v-1h1v-1h1v-1h2v-1h-1v-1h1v-2h1zM5 20h2v1h-2zM19 21v1h1v-1zM21 21v3h3v-3zM0 22h7v7h-7zM22 22h1v1h-1zM27 22h1v1h-1zM1 23v5h5v-5zM28 23h1v1h-1zM2 24h3v3h-3zM17 24v1h1v-1zM21 25v1h2v-1zM14 26h1v1h1v1h1v1h-3zM9 27h1v1h-1zM26 27h1v1h-1zM28 27h1v1h-1z" style="fill:#000" transform="translate(0,0) scale(11)"/></svg>
+SVG
+
 AS_BASIC = <<~STR
   XXXXXXXOOOXOXOOXXXOOOOXXXXXXX
   XOOOOOXOOXXXXXOOXOXOOOXOOOOOX
diff --git a/spec/rqrcode/export_svg_spec.rb b/spec/rqrcode/export_svg_spec.rb
index 816bc74..6306310 100644
--- a/spec/rqrcode/export_svg_spec.rb
+++ b/spec/rqrcode/export_svg_spec.rb
@@ -33,11 +33,20 @@
   end
 
   context "standalone false" do
-    it "must export to svg" do
+    it "will not include the <xml>" do
       expect(RQRCode::QRCode.new("https://kyan.com").as_svg(
         standalone: false,
         use_path: true
       )).to eq(AS_SVG3)
     end
   end
+
+  context "viewbox true" do
+    it "will use the viewBox attr" do
+      expect(RQRCode::QRCode.new("https://kyan.com").as_svg(
+        viewbox: true,
+        use_path: true
+      )).to eq(AS_SVG4)
+    end
+  end
 end