diff --git a/Software/.gitignore b/Software/.gitignore
index 95c6646..0dd8f9d 100644
--- a/Software/.gitignore
+++ b/Software/.gitignore
@@ -1,5 +1,6 @@
 data/
 data_src/version
+node_modules/
 .pio
 .vscode/.browse.c_cpp.db*
 .vscode/c_cpp_properties.json
diff --git a/Software/codegen/prepare_littlefs.py b/Software/codegen/prepare_littlefs.py
index dcf8d81..09c768e 100644
--- a/Software/codegen/prepare_littlefs.py
+++ b/Software/codegen/prepare_littlefs.py
@@ -1,4 +1,3 @@
-import glob
 import shutil
 import gzip
 import os
@@ -8,23 +7,40 @@ from os import popen
 Import("env")
 Import("projenv")
 
-# Überprüfe die Betriebssystemplattform
-if platform.system() == "Windows":
-    # Setze die Pfade zu den Tools für Windows
-    html_minifier_path = os.path.join(os.getenv("APPDATA"), "npm", "html-minifier.cmd")
-    uglifyjs_path = os.path.join(os.getenv("APPDATA"), "npm", "uglifyjs.cmd")
-    terser_path = os.path.join(os.getenv("APPDATA"), "npm", "terser.cmd")
-    cssnano_path = os.path.join(os.getenv("APPDATA"), "npm", "cssnano.cmd")
-elif platform.system() == "Linux":
-    # Setze die Namen der Tools für Linux
-    html_minifier_path = "html-minifier"
-    uglifyjs_path = "uglifyjs"
-    terser_path = "terser"
-    cssnano_path = "cssnano"
-else:
-    # Hier könntest du weitere Bedingungen für andere Betriebssysteme hinzufügen
-    raise Exception("Unterstütztes Betriebssystem nicht erkannt")
+def resolve_tool(name):
+    local_bin = os.path.join(env['PROJECT_DIR'], 'node_modules', '.bin', name)
+    if platform.system() == "Windows":
+        local_bin += ".cmd"
+    if os.path.exists(local_bin):
+        return local_bin
 
+    found = shutil.which(name)
+    if found:
+        return found
+
+    raise FileNotFoundError(f"{name} wurde nicht gefunden. Bitte `npm install` ausführen.")
+
+def ensure_npm_dependencies():
+    node_modules_bin = os.path.join(env['PROJECT_DIR'], 'node_modules', '.bin')
+    required_tools = ["html-minifier", "terser", "cleancss"]
+    missing = False
+
+    for tool in required_tools:
+        path = os.path.join(node_modules_bin, tool + ('.cmd' if platform.system() == "Windows" else ''))
+        if not os.path.exists(path):
+            missing = True
+            break
+
+    if missing:
+        print("NPM-Abhängigkeiten fehlen – führe `npm install` aus...")
+        subprocess.run(["npm", "install"], cwd=env['PROJECT_DIR'], check=True)
+
+
+ensure_npm_dependencies()
+
+html_minifier_path = resolve_tool("html-minifier")
+terser_path = resolve_tool("terser")
+cleancss_path = resolve_tool("cleancss")
 
 def minify_html(input_path, output_path):
     subprocess.run([html_minifier_path, '--collapse-whitespace', '--remove-comments', input_path, '-o', output_path])
@@ -33,7 +49,7 @@ def minify_js(input_path, output_path):
     subprocess.run([terser_path, input_path, '-o', output_path, '-c', '-m'])
 
 def minify_css(input_path, output_path):
-    subprocess.run([cssnano_path, '--no-discardUnused', input_path, output_path])
+    subprocess.run([cleancss_path, '--no-discardUnused', input_path, output_path])
 
 def process_file(src_path, dest_path):
     _, file_extension = os.path.splitext(src_path)
@@ -152,7 +168,8 @@ def gzip_webfiles(source, target, env):
             target_file_path = data_dir_path + filename_subdir
             os.makedirs(os.path.dirname(target_file_path), exist_ok=True)
             print('GZIP: Compressed... ' + target_file_path)
-            gzip_file(source_file_path, target_file_path + ".gz")
+            gzip_target_path = target_file_path + ".gz"
+            gzip_file(source_file_path, gzip_target_path)
     except IOError as e:
         was_error = True
         print('GZIP: Failed to compress file: ' + source_file_path)
diff --git a/Software/package.json b/Software/package.json
new file mode 100644
index 0000000..adba3af
--- /dev/null
+++ b/Software/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "pio-build-tools",
+  "private": true,
+  "devDependencies": {
+    "html-minifier": "^4.0.0",
+    "terser": "^5.0.0",
+    "clean-css-cli": "^5.0.0"
+  }
+}