diff --git a/chatgpt-subset-feather-icon.rb b/chatgpt-subset-feather-icon.rb
new file mode 100644
index 0000000..37907e6
--- /dev/null
+++ b/chatgpt-subset-feather-icon.rb
@@ -0,0 +1,50 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'nokogiri'
+require 'set'
+
+# 1) Find all HTML files, excluding those in "venv/"
+files = Dir.glob("**/*.html").reject { |f| f.start_with?("venv") }
+
+# 2) Extract used Feather icons
+used_icons = Set.new
+
+files.each do |file|
+  # Parse each HTML file
+  doc = File.open(file, "r:UTF-8") { |f| Nokogiri::HTML(f) }
+
+  # Look for <use xlink:href="/feather-sprite.svg#iconName">
+  doc.css("use").each do |use_tag|
+    href = use_tag["xlink:href"] || use_tag["href"]
+    if href && href.start_with?("/feather-sprite.svg#")
+      icon_name = href.split("#").last
+      used_icons << icon_name
+    end
+  end
+end
+
+puts "Found #{used_icons.size} unique icons: #{used_icons.to_a.join(', ')}"
+
+# 3) Load the full feather-sprite.svg as XML
+sprite_doc = File.open("feather-sprite.svg", "r:UTF-8") { |f| Nokogiri::XML(f) }
+
+# 4) Create a new SVG with only the required symbols
+new_svg = Nokogiri::XML::Document.new
+svg_tag = Nokogiri::XML::Node.new("svg", new_svg)
+svg_tag["xmlns"] = "http://www.w3.org/2000/svg"
+new_svg.add_child(svg_tag)
+
+sprite_doc.css("symbol").each do |symbol_node|
+  if used_icons.include?(symbol_node["id"])
+    # Duplicate the symbol node (so it can be inserted in the new document)
+    svg_tag.add_child(symbol_node.dup)
+  end
+end
+
+# 5) Save the subset sprite
+File.open("custom-sprite.svg", "w:UTF-8") do |f|
+  f.write(new_svg.to_xml)
+end
+
+puts "Generated custom-sprite.svg with only the required icons."