diff --git a/build_win.bat b/build_win.bat
new file mode 100644
index 0000000..945355a
--- /dev/null
+++ b/build_win.bat
@@ -0,0 +1,41 @@
+@echo off
+setlocal
+cd /d "%~dp0"
+
+if not exist ".venv\Scripts\python.exe" (
+  echo Create the venv first:
+  echo   python -m venv .venv
+  echo   .venv\Scripts\activate
+  echo   pip install -r requirements.txt
+  exit /b 1
+)
+
+call .venv\Scripts\activate
+
+echo Building MyKadReader GUI...
+pyinstaller --noconfirm --clean --windowed --onedir --name MyKadReader ^
+  --icon ACS_Small.ico ^
+  --hidden-import smartcard ^
+  --hidden-import smartcard.scard ^
+  --hidden-import PIL ^
+  --collect-all smartcard ^
+  --collect-all PIL ^
+  --add-data "ACS_Small.ico;." ^
+  MyKad_Reader.py
+if errorlevel 1 exit /b 1
+
+echo Building MyKadHelper API...
+pyinstaller --noconfirm --clean --console --onedir --name MyKadHelper ^
+  --icon ACS_Small.ico ^
+  --hidden-import smartcard ^
+  --hidden-import smartcard.scard ^
+  --collect-all smartcard ^
+  mykad_api.py
+if errorlevel 1 exit /b 1
+
+echo.
+echo Done.
+echo   GUI:    dist\MyKadReader\MyKadReader.exe
+echo   Helper: dist\MyKadHelper\MyKadHelper.exe
+echo Copy each whole folder. Do not copy only the .exe.
+endlocal