diff --git a/scripts/build-windows.sh b/scripts/build-windows.sh
new file mode 100755
index 0000000..785d323
--- /dev/null
+++ b/scripts/build-windows.sh
@@ -0,0 +1,156 @@
+#!/usr/bin/env bash
+# ─────────────────────────────────────────────────────────────────────────────
+# build-windows.sh
+#
+# Cross-compiles photo-converter for Windows (x86_64) using MinGW-w64.
+# Produces a self-contained directory with photo-converter.exe and all
+# required DLLs ready for distribution.
+#
+# Prerequisites (Ubuntu/Debian):
+#   sudo apt install mingw-w64 cmake ninja-build
+#   # Install MinGW-w64 cross builds of OpenCV, LibRaw, Qt6:
+#   #   Option A – compile from source with the MinGW toolchain.
+#   #   Option B – use an MXE (M cross environment) prefix.
+#   #              https://mxe.cc/
+#   #   Option C – use pre-built MinGW packages from a provider such as
+#   #              https://github.com/brechtsanders/winlibs_mingw
+#
+# Usage:
+#   bash scripts/build-windows.sh [BUILD_TYPE] [DEPS_PREFIX]
+#
+#   BUILD_TYPE    Release (default) | Debug | RelWithDebInfo
+#   DEPS_PREFIX   Path to cross-compiled dependencies
+#                 (default: /usr/x86_64-w64-mingw32)
+#
+# Example with a custom MXE prefix:
+#   bash scripts/build-windows.sh Release /opt/mxe/usr/x86_64-w64-mingw32.static
+# ─────────────────────────────────────────────────────────────────────────────
+
+set -euo pipefail
+
+# ── Configuration ─────────────────────────────────────────────────────────────
+BUILD_TYPE="${1:-Release}"
+DEPS_PREFIX="${2:-/usr/x86_64-w64-mingw32}"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+BUILD_DIR="${PROJECT_ROOT}/build-windows"
+DIST_DIR="${PROJECT_ROOT}/dist-windows"
+
+TOOLCHAIN="${PROJECT_ROOT}/cmake/toolchain-mingw64.cmake"
+
+echo "========================================================"
+echo "  photo-converter  Windows Cross-Compilation"
+echo "========================================================"
+echo "  Project root : ${PROJECT_ROOT}"
+echo "  Build dir    : ${BUILD_DIR}"
+echo "  Build type   : ${BUILD_TYPE}"
+echo "  Deps prefix  : ${DEPS_PREFIX}"
+echo "========================================================"
+
+# ── Verify prerequisites ──────────────────────────────────────────────────────
+for tool in x86_64-w64-mingw32-g++ cmake ninja; do
+    if ! command -v "${tool}" &>/dev/null; then
+        echo "ERROR: '${tool}' not found in PATH." >&2
+        echo "Install with: sudo apt install mingw-w64 cmake ninja-build" >&2
+        exit 1
+    fi
+done
+
+# ── CMake configure ──────────────────────────────────────────────────────────
+cmake \
+    -B "${BUILD_DIR}" \
+    -G Ninja \
+    -DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN}" \
+    -DCMAKE_BUILD_TYPE="${BUILD_TYPE}" \
+    -DCMAKE_INSTALL_PREFIX="${DIST_DIR}" \
+    -DCMAKE_PREFIX_PATH="${DEPS_PREFIX}" \
+    -DBUILD_TESTS=OFF \
+    -DBUILD_GUI=ON \
+    "${PROJECT_ROOT}"
+
+# ── Build ─────────────────────────────────────────────────────────────────────
+cmake --build "${BUILD_DIR}" -- -j"$(nproc)"
+
+# ── Install to dist dir ───────────────────────────────────────────────────────
+cmake --install "${BUILD_DIR}"
+
+# ── Collect runtime DLLs ─────────────────────────────────────────────────────
+# MinGW runtime and dependency DLLs must ship alongside the .exe.
+BIN_DIR="${DIST_DIR}/bin"
+mkdir -p "${BIN_DIR}"
+
+echo ""
+echo "Collecting runtime DLLs..."
+
+# Helper: copy a DLL if it exists in the sysroot.
+copy_dll() {
+    local dll_name="$1"
+    local search_paths=(
+        "${DEPS_PREFIX}/bin"
+        "${DEPS_PREFIX}/lib"
+        "/usr/lib/gcc/x86_64-w64-mingw32"
+        "/usr/x86_64-w64-mingw32/lib"
+    )
+    for dir in "${search_paths[@]}"; do
+        if [[ -f "${dir}/${dll_name}" ]]; then
+            cp -v "${dir}/${dll_name}" "${BIN_DIR}/"
+            return 0
+        fi
+    done
+    echo "  WARNING: ${dll_name} not found (may be statically linked)" >&2
+    return 0
+}
+
+# MinGW runtime DLLs (may be statically linked via -static-libgcc/-static-libstdc++)
+copy_dll "libgcc_s_seh-1.dll"     || true
+copy_dll "libstdc++-6.dll"        || true
+copy_dll "libwinpthread-1.dll"    || true
+
+# OpenCV DLLs (names include version number – use glob)
+for dll in "${DEPS_PREFIX}/bin"/libopencv_*.dll; do
+    [[ -f "${dll}" ]] && cp -v "${dll}" "${BIN_DIR}/"
+done
+
+# LibRaw
+copy_dll "libraw.dll"   || true
+copy_dll "libraw-23.dll" || true
+
+# Qt6 DLLs
+for qt_dll in Qt6Core Qt6Gui Qt6Widgets; do
+    copy_dll "${qt_dll}.dll" || true
+done
+
+# Qt platform plugin
+QT_PLATFORMS_SRC="${DEPS_PREFIX}/share/qt6/plugins/platforms"
+if [[ -d "${QT_PLATFORMS_SRC}" ]]; then
+    mkdir -p "${BIN_DIR}/platforms"
+    cp -v "${QT_PLATFORMS_SRC}/qwindows.dll" "${BIN_DIR}/platforms/" 2>/dev/null || true
+fi
+
+# ── Strip release binaries ────────────────────────────────────────────────────
+if [[ "${BUILD_TYPE}" == "Release" ]]; then
+    echo ""
+    echo "Stripping debug symbols from release binaries..."
+    x86_64-w64-mingw32-strip --strip-all "${BIN_DIR}/photo-converter.exe" 2>/dev/null || true
+    find "${BIN_DIR}" -name "*.dll" -exec x86_64-w64-mingw32-strip --strip-unneeded {} \; 2>/dev/null || true
+fi
+
+# ── Copy example config ───────────────────────────────────────────────────────
+cp -v "${PROJECT_ROOT}/config.ini" "${DIST_DIR}/config.ini.example"
+
+# ── Create ZIP archive ────────────────────────────────────────────────────────
+ARCHIVE="${PROJECT_ROOT}/photo-converter-windows-x64-${BUILD_TYPE}.zip"
+if command -v zip &>/dev/null; then
+    (cd "${PROJECT_ROOT}" && zip -r "${ARCHIVE}" "dist-windows/")
+    echo ""
+    echo "Archive: ${ARCHIVE}"
+else
+    echo "(zip not available; skipping archive creation)"
+fi
+
+echo ""
+echo "========================================================"
+echo "  Build complete!"
+echo "  Output: ${DIST_DIR}"
+echo "  Run: wine ${BIN_DIR}/photo-converter.exe --help"
+echo "========================================================"