diff --git a/src/router.ts b/src/router.ts
index d1291e079b..5ffd5a1af9 100644
--- a/src/router.ts
+++ b/src/router.ts
@@ -20,13 +20,17 @@ import { cloudOnboardingRoutes } from './platform/cloud/onboarding/onboardingClo
 
 const isFileProtocol = window.location.protocol === 'file:'
 
-// Determine base path for the router
-// - Electron: always root
-// - Web: rely on Vite's BASE_URL (configured via vite.config `base`)
+/**
+ * Determine base path for the router.
+ * - Electron: always root
+ * - Cloud: use Vite's BASE_URL (configured at build time)
+ * - Standard web (including reverse proxy subpaths): use window.location.pathname
+ *   to support deployments like http://mysite.com/ComfyUI/
+ */
 function getBasePath(): string {
   if (isElectron()) return '/'
-  // Vite injects BASE_URL at build/dev time; default to '/'
-  return import.meta.env?.BASE_URL || '/'
+  if (isCloud) return import.meta.env?.BASE_URL || '/'
+  return window.location.pathname
 }
 
 const basePath = getBasePath()