diff --git a/toonz/sources/common/tapptools/tenv.cpp b/toonz/sources/common/tapptools/tenv.cpp
index d7b3268..90a981c 100644
--- a/toonz/sources/common/tapptools/tenv.cpp
+++ b/toonz/sources/common/tapptools/tenv.cpp
@@ -5,9 +5,7 @@
 #include "tconvert.h"
 #include "tfilepath_io.h"
 
-#ifdef LINUX
 #include <QDir>
-#endif
 #include <QSettings>
 
 #ifdef LEVO_MACOSX
@@ -44,12 +42,16 @@ class EnvGlobals {  // singleton
   std::string m_moduleName;
   std::string m_rootVarName;
   std::string m_systemVarPrefix;
+  std::string m_workingDirectory;
   TFilePath m_registryRoot;
   TFilePath m_envFile;
   TFilePath *m_stuffDir;
   TFilePath *m_dllRelativeDir;
+  bool m_isPortable = false;
 
-  EnvGlobals() : m_stuffDir(0) {}
+  EnvGlobals() : m_stuffDir(0) {
+    setWorkingDirectory();
+  }
 
 public:
   ~EnvGlobals() { delete m_stuffDir; }
@@ -125,6 +127,9 @@ public:
 
   TFilePath getStuffDir() {
     if (m_stuffDir) return *m_stuffDir;
+    if (m_isPortable)
+      return TFilePath((getWorkingDirectory() + "\\portablestuff\\"));
+
     return TFilePath(getSystemVarValue(m_rootVarName));
   }
   void setStuffDir(const TFilePath &stuffDir) {
@@ -184,7 +189,26 @@ public:
   std::string getRootVarName() { return m_rootVarName; }
 
   void setSystemVarPrefix(std::string prefix) { m_systemVarPrefix = prefix; }
-  std::string getSystemVarPrefix() { return m_systemVarPrefix; }
+  std::string getSystemVarPrefix() {
+    if (getIsPortable()) return "";
+    return m_systemVarPrefix;
+  }
+
+  void setWorkingDirectory() {
+    QString workingDirectoryTmp  = QDir::currentPath();
+    QByteArray ba                = workingDirectoryTmp.toLatin1();
+    const char *workingDirectory = ba.data();
+    m_workingDirectory           = workingDirectory;
+
+    // check if portable
+    TFilePath portableCheck =
+        TFilePath(m_workingDirectory + "\\portablestuff\\");
+    TFileStatus portableStatus(portableCheck);
+    m_isPortable = portableStatus.doesExist();
+  }
+  std::string getWorkingDirectory() { return m_workingDirectory; }
+
+  bool getIsPortable() { return m_isPortable; }
 
   void setDllRelativeDir(const TFilePath &dllRelativeDir) {
     delete m_dllRelativeDir;
@@ -507,6 +531,8 @@ TFilePath TEnv::getStuffDir() {
   //#endif
 }
 
+bool TEnv::getIsPortable() { return EnvGlobals::instance()->getIsPortable(); }
+
 TFilePath TEnv::getConfigDir() {
   TFilePath configDir = getSystemVarPathValue(getSystemVarPrefix() + "CONFIG");
   if (configDir == TFilePath()) configDir = getStuffDir() + "config";
diff --git a/toonz/sources/include/tenv.h b/toonz/sources/include/tenv.h
index b0ab78e..5c97cf3 100644
--- a/toonz/sources/include/tenv.h
+++ b/toonz/sources/include/tenv.h
@@ -95,6 +95,8 @@ DVAPI void setApplication(std::string applicationName, std::string version,
 DVAPI std::string getApplicationName();
 DVAPI std::string getApplicationVersion();
 
+DVAPI bool getIsPortable();
+
 // es.: TEnv::setModuleFullName("Toonz 5.0.1 Harlequin");
 // (default: "<applicationName> <applicationVersion>")
 DVAPI void setApplicationFullName(std::string applicationFullName);
diff --git a/toonz/sources/toonz/main.cpp b/toonz/sources/toonz/main.cpp
index 43e1010..d124aae 100644
--- a/toonz/sources/toonz/main.cpp
+++ b/toonz/sources/toonz/main.cpp
@@ -528,7 +528,7 @@ int main(int argc, char *argv[]) {
 
   loadShaderInterfaces(ToonzFolder::getLibraryFolder() + TFilePath("shaders"));
 
-  splash.showMessage(offsetStr + "Initializing Toonz application ...",
+  splash.showMessage(offsetStr + "Initializing OpenToonz ...",
                      Qt::AlignCenter, Qt::white);
   a.processEvents();
 
@@ -591,9 +591,13 @@ int main(int argc, char *argv[]) {
 
   TApp::instance()->setMainWindow(&w);
   w.setWindowTitle(applicationFullName);
-
-  splash.showMessage(offsetStr + "Starting main window ...", Qt::AlignCenter,
-                     Qt::white);
+  if (TEnv::getIsPortable()) {
+    splash.showMessage(offsetStr + "Starting OpenToonz Portable ...",
+                       Qt::AlignCenter, Qt::white);
+  } else {
+    splash.showMessage(offsetStr + "Starting main window ...", Qt::AlignCenter,
+                       Qt::white);
+  }
   a.processEvents();
 
   TFilePath fp = ToonzFolder::getModuleFile("mainwindow.ini");