diff --git a/src/codex-launcher-gui b/src/codex-launcher-gui
index 9bbf7bc..167a50e 100755
--- a/src/codex-launcher-gui
+++ b/src/codex-launcher-gui
@@ -2802,7 +2802,7 @@ class LauncherWin(Gtk.Window):
         dlg = Gtk.Dialog(title="OAuth 2.0 Client Secrets", parent=self, modal=True)
         dlg.add_button("Cancel", Gtk.ResponseType.CANCEL)
         dlg.add_button("Save", Gtk.ResponseType.OK)
-        dlg.set_default_size(520, 340)
+        dlg.set_default_size(540, 420)
         area = dlg.get_content_area()
         area.set_margin_start(16)
         area.set_margin_end(16)
@@ -2814,7 +2814,13 @@ class LauncherWin(Gtk.Window):
 
         fields = {}
         for section_key, section_label in [("antigravity", "Antigravity (CloudCode)"), ("gemini_cli", "Gemini CLI")]:
-            area.pack_start(Gtk.Label(label=f"\n<b>{section_label}</b>", use_markup=True, xalign=0), False, False, 2)
+            section_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=2)
+            hdr_row = Gtk.Box(spacing=6)
+            hdr_row.pack_start(Gtk.Label(label=f"\n<b>{section_label}</b>", use_markup=True, xalign=0), True, True, 0)
+            import_btn = Gtk.Button(label="Import JSON")
+            import_btn.set_size_request(100, -1)
+            hdr_row.pack_end(import_btn, False, False, 0)
+            section_box.pack_start(hdr_row, False, False, 2)
             sec = data.get(section_key, {})
             for fk, fl in [("client_id", "Client ID"), ("client_secret", "Client Secret")]:
                 row = Gtk.Box(spacing=6)
@@ -2828,10 +2834,12 @@ class LauncherWin(Gtk.Window):
                     entry.set_invisible_char("*")
                 row.pack_start(lbl, False, False, 0)
                 row.pack_start(entry, True, True, 0)
-                area.pack_start(row, False, False, 2)
+                section_box.pack_start(row, False, False, 2)
                 fields[(section_key, fk)] = entry
+            import_btn.connect("clicked", lambda b, sk=section_key: self._import_oauth_json(fields, sk))
+            area.pack_start(section_box, False, False, 0)
 
-        area.pack_start(Gtk.Label(label="\n<small>Get credentials from console.cloud.google.com → APIs & Services → Credentials</small>", use_markup=True, xalign=0), False, False, 4)
+        area.pack_start(Gtk.Label(label="\n<small>Import a client_secret_*.json from Google Cloud Console\nor edit fields manually. console.cloud.google.com → Credentials</small>", use_markup=True, xalign=0), False, False, 4)
         area.show_all()
 
         if dlg.run() == Gtk.ResponseType.OK:
@@ -2848,6 +2856,32 @@ class LauncherWin(Gtk.Window):
                 self._show_error_dialog("Save failed", str(e))
         dlg.destroy()
 
+    def _import_oauth_json(self, fields, section_key):
+        chooser = Gtk.FileChooserDialog(
+            title="Import Google OAuth Client Secret JSON",
+            parent=self, action=Gtk.FileChooserAction.OPEN)
+        chooser.add_button("Cancel", Gtk.ResponseType.CANCEL)
+        chooser.add_button("Open", Gtk.ResponseType.OK)
+        filt = Gtk.FileFilter()
+        filt.set_name("JSON files")
+        filt.add_pattern("*.json")
+        chooser.add_filter(filt)
+        if chooser.run() == Gtk.ResponseType.OK:
+            path = chooser.get_filename()
+            try:
+                with open(path) as f:
+                    raw = json.load(f)
+                creds = raw.get("installed") or raw.get("web") or raw
+                cid = creds.get("client_id", "")
+                csec = creds.get("client_secret", "")
+                if not cid or not csec:
+                    raise ValueError("JSON does not contain client_id and client_secret")
+                fields[(section_key, "client_id")].set_text(cid)
+                fields[(section_key, "client_secret")].set_text(csec)
+            except Exception as e:
+                self._show_error_dialog("Import failed", str(e))
+        chooser.destroy()
+
 # ═══════════════════════════════════════════════════════════════════
 # Endpoint manager dialog
 # ═══════════════════════════════════════════════════════════════════