diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index 7cb5d92..7037c81 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -1,14 +1,18 @@
 PATH
   remote: .
   specs:
-    libptouch (1.0.0)
+    libptouch (1.0.1)
+      barby
       ffi (~> 1.15)
       rexml
+      rqrcode
 
 GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.3)
+    barby (0.7.0)
+    chunky_png (1.4.0)
     ffi (1.17.4)
     ffi (1.17.4-aarch64-linux-gnu)
     ffi (1.17.4-aarch64-linux-musl)
@@ -32,6 +36,10 @@ GEM
     rainbow (3.1.1)
     regexp_parser (2.12.0)
     rexml (3.4.4)
+    rqrcode (3.2.0)
+      chunky_png (~> 1.0)
+      rqrcode_core (~> 2.0)
+    rqrcode_core (2.1.0)
     rubocop (1.86.1)
       json (~> 2.3)
       language_server-protocol (~> 3.17.0.2)
@@ -70,6 +78,8 @@ DEPENDENCIES
 
 CHECKSUMS
   ast (2.4.3) sha256=954615157c1d6a382bc27d690d973195e79db7f55e9765ac7c481c60bdb4d383
+  barby (0.7.0) sha256=8dbc7c0c320e596135d97929c0df77f969e9f9c955a157cf6749c05b44dae213
+  chunky_png (1.4.0) sha256=89d5b31b55c0cf4da3cf89a2b4ebc3178d8abe8cbaf116a1dba95668502fdcfe
   ffi (1.17.4) sha256=bcd1642e06f0d16fc9e09ac6d49c3a7298b9789bcb58127302f934e437d60acf
   ffi (1.17.4-aarch64-linux-gnu) sha256=b208f06f91ffd8f5e1193da3cae3d2ccfc27fc36fba577baf698d26d91c080df
   ffi (1.17.4-aarch64-linux-musl) sha256=9286b7a615f2676245283aef0a0a3b475ae3aae2bb5448baace630bb77b91f39
@@ -83,7 +93,7 @@ CHECKSUMS
   ffi (1.17.4-x86_64-linux-musl) sha256=3fdf9888483de005f8ef8d1cf2d3b20d86626af206cbf780f6a6a12439a9c49e
   json (2.19.3) sha256=289b0bb53052a1fa8c34ab33cc750b659ba14a5c45f3fcf4b18762dc67c78646
   language_server-protocol (3.17.0.5) sha256=fd1e39a51a28bf3eec959379985a72e296e9f9acfce46f6a79d31ca8760803cc
-  libptouch (1.0.0)
+  libptouch (1.0.1)
   lint_roller (1.1.0) sha256=2c0c845b632a7d172cb849cc90c1bce937a28c5c8ccccb50dfd46a485003cc87
   parallel (2.0.1) sha256=337782d3e39f4121e67563bf91dd8ece67f48923d90698614773a0ec9a5b2c7d
   parser (3.3.11.1) sha256=d17ace7aabe3e72c3cc94043714be27cc6f852f104d81aa284c2281aecc65d54
@@ -92,6 +102,8 @@ CHECKSUMS
   rainbow (3.1.1) sha256=039491aa3a89f42efa1d6dec2fc4e62ede96eb6acd95e52f1ad581182b79bc6a
   regexp_parser (2.12.0) sha256=35a916a1d63190ab5c9009457136ae5f3c0c7512d60291d0d1378ba18ce08ebb
   rexml (3.4.4) sha256=19e0a2c3425dfbf2d4fc1189747bdb2f849b6c5e74180401b15734bc97b5d142
+  rqrcode (3.2.0) sha256=64c1494ca6bb67d731330f38b50e3fd09eeab4f5dcd04b608e21218d1d0b9542
+  rqrcode_core (2.1.0) sha256=f303b85df89c1b8fc5ee8dc19808c9dc4330e6329b660d99d4a8cbb36ca13051
   rubocop (1.86.1) sha256=44415f3f01d01a21e01132248d2fd0867572475b566ca188a0a42133a08d4531
   rubocop-ast (1.49.1) sha256=4412f3ee70f6fe4546cc489548e0f6fcf76cafcfa80fa03af67098ffed755035
   ruby-progressbar (1.13.0) sha256=80fc9c47a9b640d6834e0dc7b3c94c9df37f08cb072b7761e4a71e22cff29b33
diff --git a/ruby/README.md b/ruby/README.md
index 4edfc63..7f16e7f 100644
--- a/ruby/README.md
+++ b/ruby/README.md
@@ -37,6 +37,7 @@ SVG は現在装着テープの印字可能幅に合わせて自動拡大・縮
 
 オプションは C 側に合わせ、`**-p` / `--pid`** で USB 製品 ID（16 進可）を指定できます。省略時は PT-P900W（`Libptouch::USB_PID_PTP900W` = `0x2085`）。例: PT-P750W `0x2062`、PT-P710BT `0x20af`（`libptouch.h` / `Libptouch` 定数と同じ）。
 また、`--template`（SVG）と `--data`（JSON/YAML）を使うと `data-field` 属性をキーにした差込印刷が可能です。
+`data-kb-placeholder="qr"` / `data-kb-placeholder="barcode"` を付けた SVG 要素（`x/y/width/height` 必須）には、対応する `data-field` 値から QR / Code128 バーコードを生成して差し込みできます。
 `--trim-right[=DOTS]` を付けると、libptouch 側の共通処理でラベル右側の空白ドット列を削減します。`DOTS` 省略時は左余白ドット数を使い、取得失敗時は `0` にフォールバックします。
 
 開発ツリーからそのまま試す例:
diff --git a/ruby/lib/libptouch/cli/label_print.rb b/ruby/lib/libptouch/cli/label_print.rb
index 3aafb40..cc64f52 100644
--- a/ruby/lib/libptouch/cli/label_print.rb
+++ b/ruby/lib/libptouch/cli/label_print.rb
@@ -2,9 +2,13 @@
 
 require "json"
 require "optparse"
+require "rqrcode"
 require "rexml/document"
 require "tempfile"
 require "yaml"
+require "barby"
+require "barby/barcode/code_128"
+require "barby/outputter/svg_outputter"
 
 require "libptouch"
 
@@ -289,12 +293,155 @@ module Libptouch
 
           replace_text_element_content(el, data[key].to_s)
         end
+        replace_code_placeholders(doc, data)
         out = +""
         formatter = REXML::Formatters::Default.new
         formatter.write(doc, out)
         out
       end
 
+      def replace_code_placeholders(doc, data)
+        doc.elements.each("//*[@data-field][@data-kb-placeholder]") do |el|
+          key = el.attributes["data-field"].to_s
+          next unless data.key?(key)
+
+          kind = el.attributes["data-kb-placeholder"].to_s.downcase
+          next unless %w[qr barcode].include?(kind)
+
+          x, y, width, height = read_box(el)
+          next if width <= 0 || height <= 0
+
+          raw_value = data[key].to_s
+          next if raw_value.empty?
+
+          replacement = build_code_svg_element(
+            kind: kind,
+            value: raw_value,
+            x: x,
+            y: y,
+            width: width,
+            height: height
+          )
+          el.parent&.insert_after(el, replacement)
+          el.parent&.delete(el)
+        end
+      end
+
+      def read_box(el)
+        x = el.attributes["x"].to_s.to_f
+        y = el.attributes["y"].to_s.to_f
+        width = el.attributes["width"].to_s.to_f
+        height = el.attributes["height"].to_s.to_f
+        [x, y, width, height]
+      end
+
+      def build_code_svg_element(kind:, value:, x:, y:, width:, height:)
+        svg_fragment =
+          if kind == "qr"
+            render_qr_svg(value)
+          else
+            render_barcode_svg(value)
+          end
+        fragment_doc = REXML::Document.new(strip_xml_declaration(svg_fragment))
+        svg_root = fragment_doc.root
+        svg_root = wrap_non_svg_root(svg_root) unless svg_root&.name == "svg"
+
+        if kind == "qr"
+          apply_qr_svg_box(svg_root, x: x, y: y, width: width, height: height)
+        else
+          apply_barcode_svg_box(svg_root, x: x, y: y, height: height)
+        end
+        svg_root
+      end
+
+      def apply_qr_svg_box(svg_root, x:, y:, width:, height:)
+        nat_w, nat_h = svg_natural_dimensions(svg_root)
+        if nat_w <= 0 || nat_h <= 0
+          nat_w = parse_length_attr(svg_root.attributes["width"])
+          nat_h = parse_length_attr(svg_root.attributes["height"])
+        end
+        raise ArgumentError, "QR SVG has no usable dimensions" if nat_w <= 0 || nat_h <= 0
+
+        svg_root.attributes["viewBox"] = "0 0 #{nat_w} #{nat_h}"
+        svg_root.attributes["x"] = x.to_s
+        svg_root.attributes["y"] = y.to_s
+        svg_root.attributes["width"] = width.to_s
+        svg_root.attributes["height"] = height.to_s
+        svg_root.attributes["preserveAspectRatio"] = "xMidYMid meet"
+      end
+
+      def apply_barcode_svg_box(svg_root, x:, y:, height:)
+        nat_w, nat_h = svg_natural_dimensions(svg_root)
+        if nat_w <= 0 || nat_h <= 0
+          nat_w = parse_length_attr(svg_root.attributes["width"])
+          nat_h = parse_length_attr(svg_root.attributes["height"])
+        end
+        raise ArgumentError, "barcode SVG has no usable dimensions" if nat_w <= 0 || nat_h <= 0
+
+        scale = height / nat_h
+        out_w = nat_w * scale
+        out_h = nat_h * scale
+
+        svg_root.attributes["viewBox"] = "0 0 #{nat_w} #{nat_h}"
+        svg_root.attributes["x"] = x.to_s
+        svg_root.attributes["y"] = y.to_s
+        svg_root.attributes["width"] = out_w.to_s
+        svg_root.attributes["height"] = out_h.to_s
+        svg_root.attributes["preserveAspectRatio"] = "xMidYMid meet"
+      end
+
+      def strip_xml_declaration(s)
+        s.to_s.sub(/\A<\?xml[^>]*\?>\s*/m, "")
+      end
+
+      def svg_natural_dimensions(svg_root)
+        vb = svg_root.attributes["viewBox"].to_s.strip
+        if (m = /\A\s*([-\d.eE+]+)\s+([-\d.eE+]+)\s+([-\d.eE+]+)\s+([-\d.eE+]+)\s*\z/.match(vb))
+          return [m[3].to_f, m[4].to_f]
+        end
+
+        [parse_length_attr(svg_root.attributes["width"]),
+         parse_length_attr(svg_root.attributes["height"])]
+      end
+
+      def parse_length_attr(str)
+        s = str.to_s.strip
+        return 0.0 if s.empty?
+
+        s = s.delete_suffix("px").strip
+        Float(s)
+      rescue ArgumentError
+        0.0
+      end
+
+      def render_qr_svg(value)
+        qrcode = RQRCode::QRCode.new(value)
+        qrcode.as_svg(
+          standalone: true,
+          use_path: true,
+          module_size: 1,
+          offset: 0,
+          color: "000",
+          shape_rendering: "crispEdges"
+        )
+      end
+
+      def render_barcode_svg(value)
+        barcode = Barby::Code128B.new(value)
+        Barby::SvgOutputter.new(barcode).to_svg(
+          xdim: 2,
+          height: 64,
+          margin: 0
+        )
+      end
+
+      def wrap_non_svg_root(root)
+        svg = REXML::Element.new("svg")
+        svg.add_namespace("http://www.w3.org/2000/svg")
+        svg.add_element(root)
+        svg
+      end
+
       def replace_text_element_content(text_element, value)
         # Remove all child nodes first so mixed content (<tspan>, text nodes, etc.)
         # gets replaced consistently by merge data.
diff --git a/ruby/libptouch.gemspec b/ruby/libptouch.gemspec
index 2881424..d07c0ed 100644
--- a/ruby/libptouch.gemspec
+++ b/ruby/libptouch.gemspec
@@ -29,5 +29,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "ffi", "~> 1.15"
+  spec.add_dependency "barby"
+  spec.add_dependency "rqrcode"
   spec.add_dependency "rexml"
 end