diff --git a/README.md b/README.md
index 4426ab2..f08852e 100644
--- a/README.md
+++ b/README.md
@@ -90,14 +90,16 @@ module_size     - The Pixel size of each module
                   (defaults 11)
 shape_rendering - SVG Attribute: auto | optimizeSpeed | crispEdges | geometricPrecision
                   (defaults crispEdges)
-standalone      - whether to make this a full SVG file, or only an svg to embed in other svg
+standalone      - Whether to make this a full SVG file, or only an svg to embed in other svg
                   (default true)
 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
+viewbox         - Replace the `svg.width` and `svg.height` attribute with `svg.viewBox` to
                   allow CSS scaling
                   (default false)
+svg_attributes  - A optional hash of custom <svg> attributes. Existing attributes will remain.
+                  (default {})
 ```
 Example
 ```ruby
@@ -111,7 +113,10 @@ svg = qrcode.as_svg(
   shape_rendering: 'crispEdges',
   module_size: 11,
   standalone: true,
-  use_path: true
+  use_path: true,
+  svg_attributes: {
+    id: "myUniqueId"
+  }
 )
 ```
 
diff --git a/lib/rqrcode/export/svg.rb b/lib/rqrcode/export/svg.rb
index 78b9f59..4e2fdf6 100644
--- a/lib/rqrcode/export/svg.rb
+++ b/lib/rqrcode/export/svg.rb
@@ -115,6 +115,13 @@ def end_y
         end
       end
 
+      DEFAULT_SVG_ATTRIBUTES = [
+        %(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")
+      ]
+
       SVG_PATH_COMMANDS = {
         move: "M",
         up: "v-",
@@ -145,6 +152,8 @@ def end_y
       #                   (default false)
       # viewbox         - replace `width` and `height` in <svg> with a viewBox, allows CSS scaling
       #                   (default false)
+      # svg_attributes  - A optional hash of custom <svg> attributes. Existing attributes will remain.
+      #                   (default {})
       #
       def as_svg(options = {})
         fill = options[:fill]
@@ -155,14 +164,20 @@ def as_svg(options = {})
         module_size = options[:module_size] || 11
         standalone = options[:standalone].nil? ? true : options[:standalone]
         viewbox = options[:viewbox].nil? ? false : options[:viewbox]
+        svg_attributes = options[:svg_attributes] || {}
 
         # 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}")
 
+        svg_tag_attributes = (DEFAULT_SVG_ATTRIBUTES + [
+          dimensions_attr,
+          %(shape-rendering="#{shape_rendering}")
+        ] + svg_attributes.map { |k, v| %(#{k}="#{v}") }).join(" ")
+
         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" #{dimensions_attr} shape-rendering="#{shape_rendering}">)
+        open_tag = %(<svg #{svg_tag_attributes}>)
         close_tag = "</svg>"
 
         output_tag = (use_path ? Path : Rect).new(@qrcode)
diff --git a/spec/rqrcode/data.rb b/spec/rqrcode/data.rb
index 130da00..aaf67bb 100644
--- a/spec/rqrcode/data.rb
+++ b/spec/rqrcode/data.rb
@@ -22,6 +22,10 @@
   <?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_SVG5 = <<~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" width="231" height="231" shape-rendering="crispEdges" id="myUniqueId" class="myClass"><path d="M0 0h7v7h-7zM8 0h1v1h-1zM10 0h1v1h-1zM12 0h1v3h-2v-2h1zM14 0h7v7h-7zM1 1v5h5v-5zM15 1v5h5v-5zM2 2h3v3h-3zM8 2h1v1h-1zM16 2h3v3h-3zM9 3h1v1h1v1h-1v1h-1v-1h-1v-1h1zM11 5h1v1h-1zM8 6h1v1h1v-1h1v1h1v-1h1v4h-1v1h2v-3h1v6h1v1h1v-1h1v-1h-1v-1h-1v-4h1v3h2v-1h-1v-2h1v1h1v-1h1v1h-1v3h1v2h-1v1h-1v-1h-1v1h1v1h-4v-1h-1v-1h-3v-2h-1v-1h-2v-1h2v-1h-1v-1h-1zM5 8h2v1h-2zM10 8v1h1v-1zM0 9h1v2h-1zM2 9h1v1h-1zM4 9h1v1h-1zM6 10h1v1h-1zM10 10v1h1v-1zM2 11h1v1h1v-1h2v1h-1v1h-3zM7 11h1v1h-1zM6 12h1v1h-1zM8 12h2v1h-1v1h-1zM12 12v1h1v-1zM18 12v1h1v-1zM0 14h7v7h-7zM9 14h1v1h2v1h2v1h-1v1h-1v1h-2v-1h1v-1h-2v-1h-1v-1h1zM1 15v5h5v-5zM2 16h3v3h-3zM19 16h1v1h-1zM14 17h1v1h-1zM16 17h2v1h-1v1h-1zM13 18h1v1h-1zM19 18h2v1h-2zM17 19h2v1h-2zM10 20h2v1h-2zM19 20h1v1h-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 6306310..53cbed3 100644
--- a/spec/rqrcode/export_svg_spec.rb
+++ b/spec/rqrcode/export_svg_spec.rb
@@ -49,4 +49,16 @@
       )).to eq(AS_SVG4)
     end
   end
+
+  context "svg_attributes" do
+    it "renders `svg_attributes` when provided " do
+      expect(RQRCode::QRCode.new("qrcode").as_svg(
+        use_path: true,
+        svg_attributes: {
+          id: "myUniqueId",
+          class: "myClass"
+        }
+      )).to eq(AS_SVG5)
+    end
+  end
 end