diff --git a/main.js b/main.js
index f800e74..1125305 100644
--- a/main.js
+++ b/main.js
@@ -1,11 +1,13 @@
 const { app, BrowserWindow, dialog, ipcMain } = require('electron');
 const path = require('path');
+const fs = require('fs-extra');
 
 const { processFolder } = require('./services/folderProcessor');
 const { processZip } = require('./services/zipProcessor');
 
 const CAD_EXTENSIONS = ['prt', 'asm', 'dwr'];
 const DEFAULT_DESTINATION = './output/cad';
+const SETTINGS_FILENAME = 'cad-router-settings.json';
 
 function buildConfig(destination) {
   const resolvedDestination = String(destination || '').trim() || DEFAULT_DESTINATION;
@@ -15,6 +17,31 @@ function buildConfig(destination) {
   };
 }
 
+function getSettingsPath() {
+  return path.join(app.getPath('userData'), SETTINGS_FILENAME);
+}
+
+async function loadPersistedDestination() {
+  try {
+    const settingsPath = getSettingsPath();
+    if (!(await fs.pathExists(settingsPath))) {
+      return DEFAULT_DESTINATION;
+    }
+
+    const settings = await fs.readJson(settingsPath);
+    const destination = String(settings?.destination || '').trim();
+    return destination || DEFAULT_DESTINATION;
+  } catch {
+    return DEFAULT_DESTINATION;
+  }
+}
+
+async function persistDestination(destination) {
+  const settingsPath = getSettingsPath();
+  await fs.ensureDir(path.dirname(settingsPath));
+  await fs.writeJson(settingsPath, { destination }, { spaces: 2 });
+}
+
 let config = buildConfig(DEFAULT_DESTINATION);
 
 function createWindow() {
@@ -31,7 +58,9 @@ function createWindow() {
   win.loadFile(path.join(__dirname, 'renderer', 'index.html'));
 }
 
-app.whenReady().then(() => {
+app.whenReady().then(async () => {
+  const persistedDestination = await loadPersistedDestination();
+  config = buildConfig(persistedDestination);
   createWindow();
 
   app.on('activate', () => {
@@ -98,5 +127,6 @@ ipcMain.handle('update-destination', async (_event, payload) => {
   }
 
   config = buildConfig(destination);
+  await persistDestination(config.destination);
   return { destination: config.destination };
 });