diff --git a/src/auth-interactive.mjs b/src/auth-interactive.mjs
index 4eabe52..d04ca83 100644
--- a/src/auth-interactive.mjs
+++ b/src/auth-interactive.mjs
@@ -3,12 +3,28 @@ import { resolve, dirname } from 'node:path';
 import { writeFileSync, mkdtempSync, cpSync, rmSync, existsSync, mkdirSync } from 'node:fs';
 import { tmpdir } from 'node:os';
 
+function defaultChromeUserData() {
+  const home = process.env.HOME || '';
+  switch (process.platform) {
+    case 'darwin':
+      return resolve(home, 'Library/Application Support/Google/Chrome');
+    case 'linux':
+      return resolve(home, '.config/google-chrome');
+    case 'win32':
+      return resolve(
+        process.env.LOCALAPPDATA || resolve(home, 'AppData/Local'),
+        'Google/Chrome/User Data',
+      );
+    default:
+      return resolve(home, '.config/google-chrome');
+  }
+}
+
 const AUTH_PATH =
   process.env.GEMINI_WEB_AUTH_PATH ||
   resolve(process.env.HOME, '.gemini-cli-web', 'auth.json');
 const CHROME_USER_DATA =
-  process.env.GEMINI_WEB_CHROME_USER_DATA ||
-  resolve(process.env.HOME, 'Library/Application Support/Google/Chrome');
+  process.env.GEMINI_WEB_CHROME_USER_DATA || defaultChromeUserData();
 
 function save(psid, psidts) {
   mkdirSync(dirname(AUTH_PATH), { recursive: true });