diff --git a/stuff/profiles/layouts/shortcuts/defopentoonz.ini b/stuff/profiles/layouts/shortcuts/defopentoonz.ini
index ebb88c6..27ec312 100644
--- a/stuff/profiles/layouts/shortcuts/defopentoonz.ini
+++ b/stuff/profiles/layouts/shortcuts/defopentoonz.ini
@@ -188,7 +188,7 @@ MI_NextDrawing=.
 MI_NextFrame=Shift+.
 MI_NextStep=
 MI_NoShift=
-MI_OpacityCheck=1
+MI_OpacityCheck=Alt+1
 MI_OpenBatchServers=
 MI_OpenChild=
 MI_OpenCleanupSettings=
@@ -359,8 +359,8 @@ T_Tape=T
 T_Tracker=
 T_Type=Y
 T_Zoom=Shift+Space
-T_ZoomFit=9
-T_ZoomReset=0
+T_ZoomFit=Alt+9
+T_ZoomReset=Alt+0
 T_Zoomin=+
 T_Zoomout=-
 MI_LoadRecentImage=
diff --git a/stuff/profiles/layouts/shortcuts/otharmony.ini b/stuff/profiles/layouts/shortcuts/otharmony.ini
index 8464172..3675e6d 100644
--- a/stuff/profiles/layouts/shortcuts/otharmony.ini
+++ b/stuff/profiles/layouts/shortcuts/otharmony.ini
@@ -54,8 +54,8 @@ T_Tape=Alt+C
 T_Type=Alt+9
 T_Zoom=Alt+Z
 T_ZoomReset=
-T_Zoomin=2
-T_Zoomout=1
+T_Zoomin=Alt+2
+T_Zoomout=Alt+1
 A_DecreaseBrushHardness=
 A_DecreaseMaxBrushThickness=
 A_DecreaseMinBrushThickness=
@@ -143,7 +143,7 @@ MI_CloneChild=
 MI_CloneLevel=
 MI_ClonePreview=
 MI_CloseChild=
-MI_Collapse=0
+MI_Collapse=Alt+0
 MI_CollectAssets=
 MI_CompareToSnapshot=
 MI_ConvertFileWithInput=
diff --git a/toonz/sources/common/tvrender/tpalette.cpp b/toonz/sources/common/tvrender/tpalette.cpp
index 902a439..ad236ef 100644
--- a/toonz/sources/common/tvrender/tpalette.cpp
+++ b/toonz/sources/common/tvrender/tpalette.cpp
@@ -184,7 +184,8 @@ TPalette::TPalette()
     , m_dirtyFlag(false)
     , m_mutex(QMutex::Recursive)
     , m_isLocked(false)
-    , m_askOverwriteFlag(false) {
+    , m_askOverwriteFlag(false)
+    , m_shortcutScopeIndex(0) {
   QString tempName(QObject::tr("colors"));
   std::wstring pageName = tempName.toStdWString();
   Page *page            = addPage(pageName);
@@ -878,9 +879,10 @@ void TPalette::assign(const TPalette *src, bool isFromStudioPalette) {
       j->second                       = j->second->clone();
     m_styleAnimationTable[cit->first] = cit->second;
   }
-  m_globalName   = src->getGlobalName();
-  m_shortcuts    = src->m_shortcuts;
-  m_currentFrame = src->m_currentFrame;
+  m_globalName         = src->getGlobalName();
+  m_shortcuts          = src->m_shortcuts;
+  m_currentFrame       = src->m_currentFrame;
+  m_shortcutScopeIndex = src->m_shortcutScopeIndex;
   // setDirtyFlag(true);
 }
 
@@ -1080,22 +1082,26 @@ void TPalette::clearKeyframe(int styleId, int frame) {
 //-------------------------------------------------------------------
 
 int TPalette::getShortcutValue(int key) const {
-  assert('0' <= key && key <= '9');
-  std::map<int, int>::const_iterator it;
-  it = m_shortcuts.find(key);
-  if (it == m_shortcuts.end()) return -1;
-  int styleId = it->second;
-  return 0 <= styleId && styleId < getStyleCount() ? styleId : -1;
+  assert(Qt::Key_0 <= key && key <= Qt::Key_9);
+
+  int shortcutIndex = (key == Qt::Key_0) ? 9 : key - Qt::Key_1;
+  int indexInPage   = m_shortcutScopeIndex * 10 + shortcutIndex;
+  // shortcut is available only in the first page
+  return getPage(0)->getStyleId(indexInPage);
 }
 
 //-------------------------------------------------------------------
 
 int TPalette::getStyleShortcut(int styleId) const {
   assert(0 <= styleId && styleId < getStyleCount());
-  std::map<int, int>::const_iterator it;
-  for (it = m_shortcuts.begin(); it != m_shortcuts.end(); ++it)
-    if (it->second == styleId) return it->first;
-  return -1;
+
+  Page *page = getStylePage(styleId);
+  // shortcut is available only in the first page
+  if (!page || page->getIndex() != 0) return -1;
+  int indexInPage   = page->search(styleId);
+  int shortcutIndex = indexInPage - m_shortcutScopeIndex * 10;
+  if (shortcutIndex < 0 || shortcutIndex > 9) return -1;
+  return (shortcutIndex == 9) ? Qt::Key_0 : Qt::Key_1 + shortcutIndex;
 }
 
 //-------------------------------------------------------------------
@@ -1126,4 +1132,20 @@ bool TPalette::hasPickedPosStyle() {
     if (style->getPickedPosition() != TPoint()) return true;
   }
   return false;
-}
\ No newline at end of file
+}
+
+//-------------------------------------------------------------------
+
+void TPalette::nextShortcutScope(bool invert) {
+  if (invert) {
+    if (m_shortcutScopeIndex > 0)
+      m_shortcutScopeIndex -= 1;
+    else
+      m_shortcutScopeIndex = getPage(0)->getStyleCount() / 10;
+  } else {
+    if ((m_shortcutScopeIndex + 1) * 10 < getPage(0)->getStyleCount())
+      m_shortcutScopeIndex += 1;
+    else
+      m_shortcutScopeIndex = 0;
+  }
+}
diff --git a/toonz/sources/include/tools/tooloptions.h b/toonz/sources/include/tools/tooloptions.h
index b06a86d..abded96 100644
--- a/toonz/sources/include/tools/tooloptions.h
+++ b/toonz/sources/include/tools/tooloptions.h
@@ -647,7 +647,9 @@ public slots:
   void onToolChanged();
   void onStageObjectChange();
 
-  // signals:
+signals:
+  // used in ComboViewer to handle Tab focus
+  void newPanelCreated();
 
   //  void toolOptionChange();
 };
diff --git a/toonz/sources/include/toonz/preferences.h b/toonz/sources/include/toonz/preferences.h
index 37b9bd1..56f7e3e 100644
--- a/toonz/sources/include/toonz/preferences.h
+++ b/toonz/sources/include/toonz/preferences.h
@@ -307,6 +307,11 @@ public:
     return m_multiLayerStylePickerEnabled;
   }
 
+  void enableUseNumpadForSwitchingStyles(bool on);
+  bool isUseNumpadForSwitchingStylesEnabled() const {
+    return m_useNumpadForSwitchingStyles;
+  }
+
   // Xsheet  tab
 
   void setXsheetStep(int step);  //!< Sets the step used for the <I>next/prev
@@ -516,6 +521,8 @@ private:
   std::string m_layerNameEncoding = "SJIS";  // Fixed to SJIS for now. You can
                                              // add interface if you wanna
                                              // change encoding.
+  // whether to use numpad and tab key shortcut for selecting styles
+  bool m_useNumpadForSwitchingStyles;
 
 private:
   Preferences();
diff --git a/toonz/sources/include/toonz/tscenehandle.h b/toonz/sources/include/toonz/tscenehandle.h
index bc8ded5..75ad8cf 100644
--- a/toonz/sources/include/toonz/tscenehandle.h
+++ b/toonz/sources/include/toonz/tscenehandle.h
@@ -52,7 +52,9 @@ public:
   }
   void notifyNameSceneChange() { emit nameSceneChanged(); }
 
-  void notifyPreferenceChanged() { emit preferenceChanged(); }
+  void notifyPreferenceChanged(const QString &prefName) {
+    emit preferenceChanged(prefName);
+  }
 
   void notifyPixelUnitSelected(bool on) { emit pixelUnitSelected(on); }
 
@@ -76,7 +78,7 @@ signals:
   void castChanged();
   void castFolderAdded(const TFilePath &path);
   void nameSceneChanged();
-  void preferenceChanged();
+  void preferenceChanged(const QString &prefName);
   void pixelUnitSelected(bool on);
 };
 
diff --git a/toonz/sources/include/toonzqt/paletteviewergui.h b/toonz/sources/include/toonzqt/paletteviewergui.h
index 3cc54aa..e853458 100644
--- a/toonz/sources/include/toonzqt/paletteviewergui.h
+++ b/toonz/sources/include/toonzqt/paletteviewergui.h
@@ -199,6 +199,8 @@ protected:
   void zoomInChip();
   void zoomOutChip();
 
+  bool hasShortcut(int indexInPage);
+
 private:
   DVGui::LineEdit *m_renameTextField;
   QPoint m_dragStartPosition;
diff --git a/toonz/sources/include/tpalette.h b/toonz/sources/include/tpalette.h
index a1085ce..e883e6d 100644
--- a/toonz/sources/include/tpalette.h
+++ b/toonz/sources/include/tpalette.h
@@ -211,6 +211,9 @@ private:
   //! The confirmation dialog will not be opened unless the palette is edited
   //! again,
   //! even if the palette's dirtyflag is true.
+
+  int m_shortcutScopeIndex;
+
 public:
   TPalette();
   ~TPalette();
@@ -420,6 +423,8 @@ between RGBA color components.
   bool hasPickedPosStyle();  // Returns true if there is at least one style with
                              // picked pos value
 
+  void nextShortcutScope(bool invert);
+
 public:
   // Deprecated functions
 
diff --git a/toonz/sources/tnztools/tooloptions.cpp b/toonz/sources/tnztools/tooloptions.cpp
index 28ed771..399b876 100644
--- a/toonz/sources/tnztools/tooloptions.cpp
+++ b/toonz/sources/tnztools/tooloptions.cpp
@@ -2351,6 +2351,7 @@ un po' di codice... */
 
       m_panels[tool] = panel;
       layout()->addWidget(panel);
+      emit newPanelCreated();
     } else {
       // il panel c'e' gia'.
       panel = it->second;
diff --git a/toonz/sources/toonz/CMakeLists.txt b/toonz/sources/toonz/CMakeLists.txt
index 43f9bb4..c6849a1 100644
--- a/toonz/sources/toonz/CMakeLists.txt
+++ b/toonz/sources/toonz/CMakeLists.txt
@@ -141,7 +141,8 @@ set(MOC_HEADERS
     historypane.h
     cleanupsettingspane.h
     penciltestpopup.h
-    locatorpopup.h
+	locatorpopup.h
+	styleshortcutswitchablepanel.h
 # Tracker file
     dummyprocessor.h
     metnum.h
@@ -301,7 +302,8 @@ set(SOURCES
     historypane.cpp
     cleanupsettingspane.cpp
     penciltestpopup.cpp
-    locatorpopup.cpp
+	locatorpopup.cpp
+	styleshortcutswitchablepanel.cpp
 # Tracker file
     dummyprocessor.cpp
     metnum.cpp
diff --git a/toonz/sources/toonz/comboviewerpane.cpp b/toonz/sources/toonz/comboviewerpane.cpp
index 6a10ad9..c592005 100644
--- a/toonz/sources/toonz/comboviewerpane.cpp
+++ b/toonz/sources/toonz/comboviewerpane.cpp
@@ -86,7 +86,7 @@ ComboViewerPanel::ComboViewerPanel(QWidget *parent, Qt::WindowFlags flags)
 #else
 ComboViewerPanel::ComboViewerPanel(QWidget *parent, Qt::WFlags flags)
 #endif
-    : TPanel(parent) {
+    : StyleShortcutSwitchablePanel(parent) {
   TApp *app = TApp::instance();
 
   QFrame *hbox = new QFrame(this);
@@ -103,6 +103,7 @@ ComboViewerPanel::ComboViewerPanel(QWidget *parent, Qt::WFlags flags)
   ImageUtils::FullScreenWidget *fsWidget =
       new ImageUtils::FullScreenWidget(this);
   fsWidget->setWidget(m_sceneViewer = new SceneViewer(fsWidget));
+  m_sceneViewer->setIsStyleShortcutSwitchable();
 
 #if defined(Q_OS_WIN) && (QT_VERSION >= 0x050500) && (QT_VERSION < 0x050600)
   //  Workaround for QTBUG-48288
@@ -189,6 +190,9 @@ ComboViewerPanel::ComboViewerPanel(QWidget *parent, Qt::WFlags flags)
                        SLOT(update()));
   ret = ret && connect(app->getCurrentScene(), SIGNAL(sceneSwitched()), this,
                        SLOT(onSceneSwitched()));
+  ret = ret && connect(m_toolOptions, SIGNAL(newPanelCreated()), this,
+                       SLOT(updateTabFocus()));
+
   assert(ret);
 
   // note: initializeTitleBar() refers to m_sceneViewer
@@ -336,7 +340,8 @@ ComboViewerPanel::~ComboViewerPanel() {
 
 //-----------------------------------------------------------------------------
 
-void ComboViewerPanel::showEvent(QShowEvent *) {
+void ComboViewerPanel::showEvent(QShowEvent *event) {
+  StyleShortcutSwitchablePanel::showEvent(event);
   TApp *app                    = TApp::instance();
   TFrameHandle *frameHandle    = app->getCurrentFrame();
   TSceneHandle *sceneHandle    = app->getCurrentScene();
@@ -388,9 +393,6 @@ void ComboViewerPanel::showEvent(QShowEvent *) {
 
   ret = ret && connect(app->getCurrentTool(), SIGNAL(toolSwitched()),
                        m_sceneViewer, SLOT(onToolSwitched()));
-  ret = ret && connect(sceneHandle, SIGNAL(preferenceChanged()), m_flipConsole,
-                       SLOT(onPreferenceChanged()));
-  m_flipConsole->onPreferenceChanged();
 
   assert(ret);
 
@@ -403,7 +405,8 @@ void ComboViewerPanel::showEvent(QShowEvent *) {
 
 //-----------------------------------------------------------------------------
 
-void ComboViewerPanel::hideEvent(QHideEvent *) {
+void ComboViewerPanel::hideEvent(QHideEvent *event) {
+  StyleShortcutSwitchablePanel::hideEvent(event);
   TApp *app = TApp::instance();
   disconnect(app->getCurrentScene());
   disconnect(app->getCurrentLevel());
@@ -781,3 +784,12 @@ bool ComboViewerPanel::isFrameAlreadyCached(int frame) {
 }
 
 //-----------------------------------------------------------------------------
+
+void ComboViewerPanel::onPreferenceChanged(const QString &prefName) {
+  // if no name specified (on showEvent), then process all updates
+  if (prefName == "BlankCount" || prefName == "BlankColor" ||
+      prefName.isEmpty())
+    m_flipConsole->onPreferenceChanged();
+
+  StyleShortcutSwitchablePanel::onPreferenceChanged(prefName);
+}
diff --git a/toonz/sources/toonz/comboviewerpane.h b/toonz/sources/toonz/comboviewerpane.h
index 8f935ca..d7f2ea0 100644
--- a/toonz/sources/toonz/comboviewerpane.h
+++ b/toonz/sources/toonz/comboviewerpane.h
@@ -3,7 +3,7 @@
 #ifndef COMBOVIEWER_PANE_INCLUDED
 #define COMBOVIEWER_PANE_INCLUDED
 
-#include "pane.h"
+#include "styleshortcutswitchablepanel.h"
 #include "sceneviewer.h"
 #include "toonzqt/intfield.h"
 #include "toonzqt/keyframenavigator.h"
@@ -37,7 +37,8 @@ enum CV_Parts {
 };
 //-----------------------------------------------------------------------------
 
-class ComboViewerPanel final : public TPanel, public FlipConsoleOwner {
+class ComboViewerPanel final : public StyleShortcutSwitchablePanel,
+                               public FlipConsoleOwner {
   Q_OBJECT
 
   SceneViewer *m_sceneViewer;
@@ -118,6 +119,8 @@ protected slots:
   void onSceneSwitched();
   void enableFullPreview(bool enabled);
   void enableSubCameraPreview(bool enabled);
+
+  void onPreferenceChanged(const QString &prefName) override;
 };
 
 #endif
diff --git a/toonz/sources/toonz/mainwindow.cpp b/toonz/sources/toonz/mainwindow.cpp
index afca011..23c7403 100644
--- a/toonz/sources/toonz/mainwindow.cpp
+++ b/toonz/sources/toonz/mainwindow.cpp
@@ -1689,7 +1689,7 @@ void MainWindow::defineActions() {
                         MenuScanCleanupCommandType);
   CameraTestCheck::instance()->setToggle(toggle);
 
-  createToggle(MI_OpacityCheck, tr("&Opacity Check"), "1", false,
+  createToggle(MI_OpacityCheck, tr("&Opacity Check"), "Alt+1", false,
                MenuScanCleanupCommandType);
 
   createMenuScanCleanupAction(MI_Cleanup, tr("&Cleanup"), "");
@@ -2047,8 +2047,8 @@ void MainWindow::defineActions() {
 
   createViewerAction(V_ZoomIn, tr("Zoom In"), "+");
   createViewerAction(V_ZoomOut, tr("Zoom Out"), "-");
-  createViewerAction(V_ZoomReset, tr("Reset View"), "0");
-  createViewerAction(V_ZoomFit, tr("Fit to Window"), "9");
+  createViewerAction(V_ZoomReset, tr("Reset View"), "Alt+0");
+  createViewerAction(V_ZoomFit, tr("Fit to Window"), "Alt+9");
   createViewerAction(V_ActualPixelSize, tr("Actual Pixel Size"), "N");
   createViewerAction(V_ShowHideFullScreen, tr("Show//Hide Full Screen"),
                      "Alt+F");
diff --git a/toonz/sources/toonz/preferencespopup.cpp b/toonz/sources/toonz/preferencespopup.cpp
index d9cca43..d9d06f1 100644
--- a/toonz/sources/toonz/preferencespopup.cpp
+++ b/toonz/sources/toonz/preferencespopup.cpp
@@ -359,7 +359,7 @@ void PreferencesPopup::onChunkSizeChanged() {
 void PreferencesPopup::onBlankCountChanged() {
   if (m_blanksCount && m_blankColor)
     m_pref->setBlankValues(m_blanksCount->getValue(), m_blankColor->getColor());
-  TApp::instance()->getCurrentScene()->notifyPreferenceChanged();
+  TApp::instance()->getCurrentScene()->notifyPreferenceChanged("BlankCount");
 }
 
 //-----------------------------------------------------------------------------
@@ -378,7 +378,7 @@ void PreferencesPopup::onBlankColorChanged(const TPixel32 &, bool isDragging) {
 
   if (m_blanksCount && m_blankColor)
     m_pref->setBlankValues(m_blanksCount->getValue(), m_blankColor->getColor());
-  TApp::instance()->getCurrentScene()->notifyPreferenceChanged();
+  TApp::instance()->getCurrentScene()->notifyPreferenceChanged("BlankColor");
 }
 
 //-----------------------------------------------------------------------------
@@ -927,6 +927,47 @@ void PreferencesPopup::onFfmpegTimeoutChanged() {
   m_pref->setFfmpegTimeout(m_ffmpegTimeout->getValue());
 }
 
+//-----------------------------------------------------------------------------
+
+void PreferencesPopup::onUseNumpadForSwitchingStylesClicked(bool checked) {
+  if (checked) {
+    // check if there are any commands with numpadkey shortcuts
+    CommandManager *cm = CommandManager::instance();
+    QList<QAction *> actionsList;
+    for (int key = Qt::Key_0; key <= Qt::Key_9; key++) {
+      std::string str = QKeySequence(key).toString().toStdString();
+      QAction *action = cm->getActionFromShortcut(str);
+      if (action) actionsList.append(action);
+    }
+    QAction *tabAction = cm->getActionFromShortcut("Tab");
+    if (tabAction) actionsList.append(tabAction);
+    tabAction = cm->getActionFromShortcut("Shift+Tab");
+    if (tabAction) actionsList.append(tabAction);
+    // if there are actions using numpad shortcuts, notify to release them.
+    if (!actionsList.isEmpty()) {
+      QString msgStr =
+          tr("Numpad keys are assigned to the following commands.\nIs it OK to "
+             "release these shortcuts?");
+      for (int a = 0; a < actionsList.size(); a++) {
+        msgStr += "\n" + actionsList.at(a)->iconText() + "  (" +
+                  actionsList.at(a)->shortcut().toString() + ")";
+      }
+      int ret = DVGui::MsgBox(msgStr, tr("OK"), tr("Cancel"), 1);
+      if (ret == 2 || ret == 0) {  // canceled
+        m_useNumpadForSwitchingStyles->setChecked(false);
+        return;
+      } else {  // accepted, then release shortcuts
+        for (int a = 0; a < actionsList.size(); a++)
+          cm->setShortcut(actionsList[a], "");
+      }
+    }
+  }
+  m_pref->enableUseNumpadForSwitchingStyles(checked);
+  // emit signal to update Palette and Viewer
+  TApp::instance()->getCurrentScene()->notifyPreferenceChanged(
+      "NumpadForSwitchingStyles");
+}
+
 //**********************************************************************************
 //    PrefencesPopup's  constructor
 //**********************************************************************************
@@ -1097,6 +1138,8 @@ PreferencesPopup::PreferencesPopup()
       new CheckBox(tr("Use the TLV Savebox to Limit Filling Operations"), this);
   CheckBox *minimizeSaveboxAfterEditingCB =
       new CheckBox(tr("Minimize Savebox after Editing"), this);
+  m_useNumpadForSwitchingStyles =
+      new CheckBox(tr("Use Numpad and Tab keys for Switching Styles"), this);
 
   //--- Xsheet ------------------------------
   categoryList->addItem(tr("Xsheet"));
@@ -1307,6 +1350,8 @@ PreferencesPopup::PreferencesPopup()
   minimizeSaveboxAfterEditingCB->setChecked(
       m_pref->isMinimizeSaveboxAfterEditing());
   useSaveboxToLimitFillingOpCB->setChecked(m_pref->getFillOnlySavebox());
+  m_useNumpadForSwitchingStyles->setChecked(
+      m_pref->isUseNumpadForSwitchingStylesEnabled());
 
   QStringList scanLevelTypes;
   scanLevelTypes << "tif"
@@ -1760,6 +1805,9 @@ PreferencesPopup::PreferencesPopup()
                                  Qt::AlignLeft | Qt::AlignVCenter);
       drawingFrameLay->addWidget(multiLayerStylePickerCB, 0,
                                  Qt::AlignLeft | Qt::AlignVCenter);
+      drawingFrameLay->addWidget(m_useNumpadForSwitchingStyles, 0,
+                                 Qt::AlignLeft | Qt::AlignVCenter);
+
       drawingFrameLay->addStretch(1);
     }
     drawingBox->setLayout(drawingFrameLay);
@@ -2105,6 +2153,8 @@ PreferencesPopup::PreferencesPopup()
                        SLOT(onDefLevelParameterChanged()));
   ret = ret && connect(m_defLevelDpi, SIGNAL(valueChanged()),
                        SLOT(onDefLevelParameterChanged()));
+  ret = ret && connect(m_useNumpadForSwitchingStyles, SIGNAL(clicked(bool)),
+                       SLOT(onUseNumpadForSwitchingStylesClicked(bool)));
 
   //--- Xsheet ----------------------
   ret = ret && connect(xsheetAutopanDuringPlaybackCB, SIGNAL(stateChanged(int)),
diff --git a/toonz/sources/toonz/preferencespopup.h b/toonz/sources/toonz/preferencespopup.h
index 8a49973..ba790d7 100644
--- a/toonz/sources/toonz/preferencespopup.h
+++ b/toonz/sources/toonz/preferencespopup.h
@@ -71,7 +71,8 @@ private:
   DVGui::CheckBox *m_inksOnly, *m_enableVersionControl, *m_levelsBackup,
       *m_onionSkinVisibility, *m_pixelsOnlyCB, *m_projectRootDocuments,
       *m_projectRootDesktop, *m_projectRootCustom, *m_projectRootStuff,
-      *m_onionSkinDuringPlayback, *m_autoSaveSceneCB, *m_autoSaveOtherFilesCB;
+      *m_onionSkinDuringPlayback, *m_autoSaveSceneCB, *m_autoSaveOtherFilesCB,
+      *m_useNumpadForSwitchingStyles;
 
   DVGui::FileField *m_customProjectRootFileField;
 
@@ -167,6 +168,7 @@ private slots:
   void onShowKeyframesOnCellAreaChanged(int);
   void onFfmpegPathChanged();
   void onFfmpegTimeoutChanged();
+  void onUseNumpadForSwitchingStylesClicked(bool);
 };
 
 //**********************************************************************************
diff --git a/toonz/sources/toonz/sceneviewer.h b/toonz/sources/toonz/sceneviewer.h
index 0941505..10276dc 100644
--- a/toonz/sources/toonz/sceneviewer.h
+++ b/toonz/sources/toonz/sceneviewer.h
@@ -138,6 +138,7 @@ class SceneViewer final : public QGLWidget,
 
   LocatorPopup *m_locator;
   bool m_isLocator;
+  bool m_isStyleShortcutSwitchable;
 
   // iwsw commented out temporarily
   // Ghibli3DLutUtil * m_ghibli3DLutUtil;
@@ -235,6 +236,7 @@ public:
   void setFocus(Qt::FocusReason reason) { QWidget::setFocus(reason); };
 
   void setIsLocator() { m_isLocator = true; }
+  void setIsStyleShortcutSwitchable() { m_isStyleShortcutSwitchable = true; }
 
 public:
   // SceneViewer's gadget public functions
diff --git a/toonz/sources/toonz/sceneviewerevents.cpp b/toonz/sources/toonz/sceneviewerevents.cpp
index d07163f..7a7a924 100644
--- a/toonz/sources/toonz/sceneviewerevents.cpp
+++ b/toonz/sources/toonz/sceneviewerevents.cpp
@@ -16,6 +16,10 @@
 #include "comboviewerpane.h"
 #include "locatorpopup.h"
 
+// TnzQt includes
+#include "toonzqt/tselectionhandle.h"
+#include "toonzqt/styleselection.h"
+
 // TnzTools includes
 #include "tools/cursors.h"
 #include "tools/toolhandle.h"
@@ -768,6 +772,19 @@ void SceneViewer::keyPressEvent(QKeyEvent *event) {
 
   tool->setViewer(this);
 
+  // If this object is child of Viewer or ComboViewer
+  // (m_isStyleShortcutSelective = true),
+  // then consider about shortcut for the current style selection.
+  if (m_isStyleShortcutSwitchable &&
+      Preferences::instance()->isUseNumpadForSwitchingStylesEnabled() &&
+      (!isTextToolActive) && (event->modifiers() == Qt::NoModifier ||
+                              event->modifiers() == Qt::KeypadModifier) &&
+      ((Qt::Key_0 <= key && key <= Qt::Key_9) || key == Qt::Key_Tab ||
+       key == Qt::Key_Backtab)) {
+    event->ignore();
+    return;
+  }
+
   if (key == Qt::Key_Shift)
     modifiers |= Qt::SHIFT;
   else if (key == Qt::Key_Control)
diff --git a/toonz/sources/toonz/shortcutpopup.cpp b/toonz/sources/toonz/shortcutpopup.cpp
index dda5bc8..b51b020 100644
--- a/toonz/sources/toonz/shortcutpopup.cpp
+++ b/toonz/sources/toonz/shortcutpopup.cpp
@@ -15,6 +15,9 @@
 #include "toonzqt/menubarcommand.h"
 #include "toonzqt/dvdialog.h"
 
+// TnzLib includes
+#include "toonz/preferences.h"
+
 // Qt includes
 #include <QTreeWidgetItem>
 #include <QVBoxLayout>
@@ -136,6 +139,14 @@ void ShortcutViewer::keyPressEvent(QKeyEvent *event) {
       modifiers = 0;
   }
 
+  // If "Use Numpad and Tab keys for Switching Styles" option is activated,
+  // then prevent to assign such keys
+  if (Preferences::instance()->isUseNumpadForSwitchingStylesEnabled() &&
+      modifiers == 0 && (key >= Qt::Key_0 && key <= Qt::Key_9)) {
+    event->ignore();
+    return;
+  }
+
   if (m_action) {
     CommandManager *cm = CommandManager::instance();
     QKeySequence keySequence(key + modifiers);
diff --git a/toonz/sources/toonz/styleshortcutswitchablepanel.cpp b/toonz/sources/toonz/styleshortcutswitchablepanel.cpp
new file mode 100644
index 0000000..d680521
--- /dev/null
+++ b/toonz/sources/toonz/styleshortcutswitchablepanel.cpp
@@ -0,0 +1,112 @@
+#include "styleshortcutswitchablepanel.h"
+
+// TnzLib includes
+#include "toonz/tscenehandle.h"
+#include "toonz/preferences.h"
+#include "toonz/palettecontroller.h"
+#include "toonz/tpalettehandle.h"
+
+// TnzTools includes
+#include "tools/toolhandle.h"
+#include "tools/toolcommandids.h"
+
+// TnzQt includes
+#include "toonzqt/tselectionhandle.h"
+#include "toonzqt/styleselection.h"
+
+// Tnz6 includes
+#include "tapp.h"
+
+#include <QKeyEvent>
+
+//-----------------------------------------------------------------------------
+
+void StyleShortcutSwitchablePanel::keyPressEvent(QKeyEvent *event) {
+  if (!Preferences::instance()->isUseNumpadForSwitchingStylesEnabled()) return;
+  TTool *tool = TApp::instance()->getCurrentTool()->getTool();
+  if (!tool) return;
+  if (tool->getName() == T_Type && tool->isActive()) return;
+  if (event->modifiers() != Qt::NoModifier &&
+      event->modifiers() != Qt::KeypadModifier)
+    return;
+  int key = event->key();
+  if (Qt::Key_0 <= key && key <= Qt::Key_9) {
+    TPaletteHandle *ph =
+        TApp::instance()->getPaletteController()->getCurrentLevelPalette();
+
+    TPalette *palette = ph->getPalette();
+    if (palette) {
+      int styleId = palette->getShortcutValue(key);
+      if (styleId >= 0) {
+        ph->setStyleIndex(styleId);
+        TStyleSelection *selection = dynamic_cast<TStyleSelection *>(
+            TApp::instance()->getCurrentSelection()->getSelection());
+        if (selection) selection->selectNone();
+      }
+    }
+    event->accept();
+  } else if (key == Qt::Key_Tab || key == Qt::Key_Backtab) {
+    TPaletteHandle *ph =
+        TApp::instance()->getPaletteController()->getCurrentLevelPalette();
+
+    TPalette *palette = ph->getPalette();
+    if (palette) {
+      palette->nextShortcutScope(key == Qt::Key_Backtab);
+      ph->notifyPaletteChanged();
+    }
+    event->accept();
+  }
+}
+
+//-----------------------------------------------------------------------------
+
+void StyleShortcutSwitchablePanel::showEvent(QShowEvent *event) {
+  TPanel::showEvent(event);
+  bool ret = connect(TApp::instance()->getCurrentScene(),
+                     SIGNAL(preferenceChanged(const QString &)), this,
+                     SLOT(onPreferenceChanged(const QString &)));
+  onPreferenceChanged("");
+  assert(ret);
+}
+
+//-----------------------------------------------------------------------------
+
+void StyleShortcutSwitchablePanel::hideEvent(QHideEvent *event) {
+  TPanel::hideEvent(event);
+  disconnect(TApp::instance()->getCurrentScene(),
+             SIGNAL(preferenceChanged(const QString &)), this,
+             SLOT(onPreferenceChanged(const QString &)));
+}
+
+//-----------------------------------------------------------------------------
+
+void StyleShortcutSwitchablePanel::onPreferenceChanged(
+    const QString &prefName) {
+  if (prefName == "NumpadForSwitchingStyles" || prefName.isEmpty())
+    updateTabFocus();
+}
+
+//-----------------------------------------------------------------------------
+
+void StyleShortcutSwitchablePanel::updateTabFocus() {
+  QList<QWidget *> widgets = findChildren<QWidget *>();
+  if (Preferences::instance()->isUseNumpadForSwitchingStylesEnabled()) {
+    // disable tab focus
+    foreach (QWidget *widget, widgets) {
+      Qt::FocusPolicy policy = widget->focusPolicy();
+      if (policy == Qt::TabFocus || policy == Qt::StrongFocus ||
+          policy == Qt::WheelFocus) {
+        m_childrenFocusPolicies[widget] = policy;
+        widget->setFocusPolicy((policy == Qt::TabFocus) ? Qt::NoFocus
+                                                        : Qt::ClickFocus);
+      }
+    }
+  } else {
+    // revert tab focus
+    QHashIterator<QWidget *, Qt::FocusPolicy> i(m_childrenFocusPolicies);
+    while (i.hasNext()) {
+      i.next();
+      i.key()->setFocusPolicy(i.value());
+    }
+  }
+}
\ No newline at end of file
diff --git a/toonz/sources/toonz/styleshortcutswitchablepanel.h b/toonz/sources/toonz/styleshortcutswitchablepanel.h
new file mode 100644
index 0000000..ce68933
--- /dev/null
+++ b/toonz/sources/toonz/styleshortcutswitchablepanel.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#ifndef STYLE_SHORTCUT_SWITCHABLE_PANEL_H
+#define STYLE_SHORTCUT_SWITCHABLE_PANEL_H
+
+#include "pane.h"
+
+//=============================================================================
+// StyleShortcutSwitchablePanel
+//-----------------------------------------------------------------------------
+// StyleShortcutSwitchablePanel class is subclass of TPanel and
+// inherited by panels which can select the current style by 0-9
+// number keys if the Preferences option
+// "Use Numpad and Tab keys for Switching Styles" is active.
+// Currently inherited by ComboViewer, Viewer and Palette
+//-----------------------------------------------------------------------------
+
+class StyleShortcutSwitchablePanel : public TPanel {
+  Q_OBJECT
+
+  QHash<QWidget *, Qt::FocusPolicy> m_childrenFocusPolicies;
+
+public:
+  StyleShortcutSwitchablePanel(
+      QWidget *parent = 0, Qt::WindowFlags flags = 0,
+      TDockWidget::Orientation orientation = TDockWidget::vertical)
+      : TPanel(parent, flags, orientation) {}
+
+protected:
+  void keyPressEvent(QKeyEvent *event) override;
+  void showEvent(QShowEvent *) override;
+  void hideEvent(QHideEvent *) override;
+
+protected slots:
+  virtual void onPreferenceChanged(const QString &prefName);
+  void updateTabFocus();
+};
+
+#endif
\ No newline at end of file
diff --git a/toonz/sources/toonz/tpanels.cpp b/toonz/sources/toonz/tpanels.cpp
index 74fee6a..8ed5795 100644
--- a/toonz/sources/toonz/tpanels.cpp
+++ b/toonz/sources/toonz/tpanels.cpp
@@ -402,7 +402,8 @@ public:
 // PaletteViewer
 //-----------------------------------------------------------------------------
 
-PaletteViewerPanel::PaletteViewerPanel(QWidget *parent) : TPanel(parent) {
+PaletteViewerPanel::PaletteViewerPanel(QWidget *parent)
+    : StyleShortcutSwitchablePanel(parent) {
   m_paletteHandle = new TPaletteHandle();
   connect(m_paletteHandle, SIGNAL(colorStyleSwitched()),
           SLOT(onColorStyleSwitched()));
diff --git a/toonz/sources/toonz/tpanels.h b/toonz/sources/toonz/tpanels.h
index ed6cbf8..d6501d8 100644
--- a/toonz/sources/toonz/tpanels.h
+++ b/toonz/sources/toonz/tpanels.h
@@ -4,6 +4,7 @@
 #define TPANELS_INCLUDED
 
 #include "pane.h"
+#include "styleshortcutswitchablepanel.h"
 
 #include "tpalette.h"
 #include "trenderer.h"
@@ -27,7 +28,7 @@ class ToolOptions;
 // PaletteViewerPanel
 //---------------------------------------------------------
 
-class PaletteViewerPanel final : public TPanel {
+class PaletteViewerPanel final : public StyleShortcutSwitchablePanel {
   Q_OBJECT
 
   TPaletteHandle *m_paletteHandle;
diff --git a/toonz/sources/toonz/viewerpane.cpp b/toonz/sources/toonz/viewerpane.cpp
index deae824..6fc4ef7 100644
--- a/toonz/sources/toonz/viewerpane.cpp
+++ b/toonz/sources/toonz/viewerpane.cpp
@@ -77,7 +77,7 @@ SceneViewerPanel::SceneViewerPanel(QWidget *parent, Qt::WindowFlags flags)
 #else
 SceneViewerPanel::SceneViewerPanel(QWidget *parent, Qt::WFlags flags)
 #endif
-    : TPanel(parent) {
+    : StyleShortcutSwitchablePanel(parent) {
   QFrame *hbox = new QFrame(this);
   hbox->setFrameStyle(QFrame::StyledPanel);
   hbox->setObjectName("ViewerPanel");
@@ -94,6 +94,7 @@ SceneViewerPanel::SceneViewerPanel(QWidget *parent, Qt::WFlags flags)
       new ImageUtils::FullScreenWidget(viewer);
 
   fsWidget->setWidget(m_sceneViewer = new SceneViewer(fsWidget));
+  m_sceneViewer->setIsStyleShortcutSwitchable();
 
   bool ret = true;
   ret      = ret && connect(m_sceneViewer, SIGNAL(onZoomChanged()),
@@ -225,7 +226,8 @@ SceneViewerPanel::~SceneViewerPanel() {}
 
 //-----------------------------------------------------------------------------
 
-void SceneViewerPanel::showEvent(QShowEvent *) {
+void SceneViewerPanel::showEvent(QShowEvent *event) {
+  StyleShortcutSwitchablePanel::showEvent(event);
   TApp *app                    = TApp::instance();
   TFrameHandle *frameHandle    = app->getCurrentFrame();
   TSceneHandle *sceneHandle    = app->getCurrentScene();
@@ -264,10 +266,6 @@ void SceneViewerPanel::showEvent(QShowEvent *) {
   ret = ret && connect(app->getCurrentTool(), SIGNAL(toolSwitched()),
                        m_sceneViewer, SLOT(onToolSwitched()));
 
-  ret = ret && connect(sceneHandle, SIGNAL(preferenceChanged()), m_flipConsole,
-                       SLOT(onPreferenceChanged()));
-  m_flipConsole->onPreferenceChanged();
-
   assert(ret);
 
   // Aggiorno FPS al valore definito nel viewer corrente.
@@ -277,7 +275,8 @@ void SceneViewerPanel::showEvent(QShowEvent *) {
 
 //-----------------------------------------------------------------------------
 
-void SceneViewerPanel::hideEvent(QHideEvent *) {
+void SceneViewerPanel::hideEvent(QHideEvent *event) {
+  StyleShortcutSwitchablePanel::hideEvent(event);
   TApp *app                    = TApp::instance();
   TFrameHandle *frameHandle    = app->getCurrentFrame();
   TSceneHandle *sceneHandle    = app->getCurrentScene();
@@ -310,9 +309,6 @@ void SceneViewerPanel::hideEvent(QHideEvent *) {
   disconnect(app->getCurrentTool(), SIGNAL(toolSwitched()), m_sceneViewer,
              SLOT(onToolSwitched()));
 
-  disconnect(sceneHandle, SIGNAL(preferenceChanged()), m_flipConsole,
-             SLOT(onPreferenceChanged()));
-
   m_flipConsole->setActive(false);
 }
 
@@ -658,6 +654,20 @@ void SceneViewerPanel::onFrameTypeChanged() {
   updateFrameMarkers();
 }
 
+//-----------------------------------------------------------------------------
+
+void SceneViewerPanel::onPreferenceChanged(const QString &prefName) {
+  // if no name specified (on StyleShortcutSelectivePanel::showEvent),
+  // then process all updates
+  if (prefName == "BlankCount" || prefName == "BlankColor" ||
+      prefName.isEmpty())
+    m_flipConsole->onPreferenceChanged();
+
+  StyleShortcutSwitchablePanel::onPreferenceChanged(prefName);
+}
+
+//-----------------------------------------------------------------------------
+
 void SceneViewerPanel::playAudioFrame(int frame) {
   if (m_first) {
     m_first = false;
@@ -703,4 +713,4 @@ void SceneViewerPanel::onButtonPressed(FlipConsole::EGadget button) {
   if (button == FlipConsole::eSound) {
     m_playSound = !m_playSound;
   }
-}
\ No newline at end of file
+}
diff --git a/toonz/sources/toonz/viewerpane.h b/toonz/sources/toonz/viewerpane.h
index b398fe4..48e5c11 100644
--- a/toonz/sources/toonz/viewerpane.h
+++ b/toonz/sources/toonz/viewerpane.h
@@ -3,7 +3,7 @@
 #ifndef VIEWER_PANE_INCLUDED
 #define VIEWER_PANE_INCLUDED
 
-#include "pane.h"
+#include "styleshortcutswitchablepanel.h"
 #include "sceneviewer.h"
 #include "toonzqt/intfield.h"
 #include "toonzqt/keyframenavigator.h"
@@ -25,7 +25,8 @@ class Ruler;
 
 class FlipConsole;
 class TXshLevel;
-class SceneViewerPanel final : public TPanel, public FlipConsoleOwner {
+class SceneViewerPanel final : public StyleShortcutSwitchablePanel,
+                               public FlipConsoleOwner {
   Q_OBJECT
 
   friend class SceneViewer;
@@ -86,6 +87,7 @@ protected slots:
   void onPlayingStatusChanged(bool playing);
   void enableFullPreview(bool enabled);
   void enableSubCameraPreview(bool enabled);
+  void onPreferenceChanged(const QString &prefName) override;
 };
 
 #endif
diff --git a/toonz/sources/toonzlib/preferences.cpp b/toonz/sources/toonzlib/preferences.cpp
index 07f7fcf..b325637 100644
--- a/toonz/sources/toonzlib/preferences.cpp
+++ b/toonz/sources/toonzlib/preferences.cpp
@@ -23,6 +23,7 @@
 // Qt includes
 #include <QSettings>
 #include <QStringList>
+#include <QAction>
 
 // boost includes
 #include <boost/bind.hpp>
@@ -294,7 +295,8 @@ Preferences::Preferences()
     , m_customProjectRoot("")
     , m_precompute(true)
     , m_ffmpegTimeout(30)
-    , m_shortcutPreset("defopentoonz") {
+    , m_shortcutPreset("defopentoonz")
+    , m_useNumpadForSwitchingStyles(true) {
   TCamera camera;
   m_defLevelType   = PLI_XSHLEVEL;
   m_defLevelWidth  = camera.getSize().lx;
@@ -563,6 +565,8 @@ Preferences::Preferences()
   QString shortcutPreset = m_settings->value("shortcutPreset").toString();
   if (shortcutPreset != "") m_shortcutPreset = shortcutPreset;
   setShortcutPreset(m_shortcutPreset.toStdString());
+  getValue(*m_settings, "useNumpadForSwitchingStyles",
+           m_useNumpadForSwitchingStyles);
 }
 
 //-----------------------------------------------------------------
@@ -1320,3 +1324,10 @@ int Preferences::matchLevelFormat(const TFilePath &fp) const {
 
   return (lft != m_levelFormats.end()) ? lft - m_levelFormats.begin() : -1;
 }
+
+//-----------------------------------------------------------------
+
+void Preferences::enableUseNumpadForSwitchingStyles(bool on) {
+  m_useNumpadForSwitchingStyles = on;
+  m_settings->setValue("useNumpadForSwitchingStyles", on ? "1" : "0");
+}
\ No newline at end of file
diff --git a/toonz/sources/toonzqt/paletteviewergui.cpp b/toonz/sources/toonzqt/paletteviewergui.cpp
index c42db3b..4cabe0d 100644
--- a/toonz/sources/toonzqt/paletteviewergui.cpp
+++ b/toonz/sources/toonzqt/paletteviewergui.cpp
@@ -591,6 +591,18 @@ void PageViewer::paintEvent(QPaintEvent *e) {
       QRect nameRect = getColorNameRect(i);
       drawColorName(p, nameRect, style, styleIndex);
 
+      // if numpad shortcut is activated, draw shortcut scope
+      if (Preferences::instance()->isUseNumpadForSwitchingStylesEnabled() &&
+          m_viewType == LEVEL_PALETTE &&
+          palette->getStyleShortcut(styleIndex) >= 0) {
+        p.setPen(QPen(QColor(0, 0, 0, 128), 2));
+        p.drawLine(nameRect.topLeft() + QPoint(2, 1),
+                   nameRect.bottomLeft() + QPoint(2, 0));
+        p.setPen(QPen(QColor(255, 255, 255, 128), 2));
+        p.drawLine(nameRect.topLeft() + QPoint(4, 1),
+                   nameRect.bottomLeft() + QPoint(4, 0));
+      }
+
       // selezione
       if (m_styleSelection->isSelected(m_page->getIndex(), i)) {
         p.setPen(Qt::white);
@@ -626,10 +638,37 @@ void PageViewer::paintEvent(QPaintEvent *e) {
       TColorStyle *style = m_page->getStyle(i);
       int styleIndex     = m_page->getStyleId(i);
 
+      // if numpad shortcut is activated, draw shortcut scope
+      if (Preferences::instance()->isUseNumpadForSwitchingStylesEnabled() &&
+          m_viewType == LEVEL_PALETTE &&
+          palette->getStyleShortcut(styleIndex) >= 0) {
+        QRect itemRect = getItemRect(i);
+        // paint dark
+        p.setPen(Qt::NoPen);
+        p.setBrush(QColor(0, 0, 0, 64));
+        p.drawRect(itemRect);
+        // check the neighbours and draw light lines
+        p.setPen(QPen(QColor(255, 255, 255, 128), 2));
+        // top
+        if (!hasShortcut(i - m_chipPerRow))
+          p.drawLine(itemRect.topLeft(), itemRect.topRight() - QPoint(1, 0));
+        // left
+        if (i % m_chipPerRow == 0 || !hasShortcut(i - 1))
+          p.drawLine(itemRect.topLeft() + QPoint(0, 1), itemRect.bottomLeft());
+        // bottom
+        if (!hasShortcut(i + m_chipPerRow))
+          p.drawLine(itemRect.bottomLeft() + QPoint(1, 0),
+                     itemRect.bottomRight());
+        // right
+        if ((i + 1) % m_chipPerRow == 0 || !hasShortcut(i + 1))
+          p.drawLine(itemRect.topRight(),
+                     itemRect.bottomRight() - QPoint(0, 1));
+      }
+
       // draw white frame if the style is selected or current
       if (m_styleSelection->isSelected(m_page->getIndex(), i) ||
           currentStyleIndex == styleIndex) {
-        QRect itemRect = getItemRect(i).adjusted(-1, -2, 1, 2);
+        QRect itemRect = getItemRect(i).adjusted(0, -1, 0, 1);
         p.setPen(Qt::NoPen);
         p.setBrush(Qt::white);
         p.drawRoundRect(itemRect, 7, 25);
@@ -795,6 +834,22 @@ void PageViewer::paintEvent(QPaintEvent *e) {
         p.drawLine(markPos - QPoint(0, 5), markPos + QPoint(0, 5));
       }
 
+      // if numpad shortcut is activated, draw shortcut number on top
+      if (Preferences::instance()->isUseNumpadForSwitchingStylesEnabled() &&
+          m_viewType == LEVEL_PALETTE &&
+          palette->getStyleShortcut(styleIndex) >= 0 &&
+          m_viewMode != SmallChips) {
+        int key      = palette->getStyleShortcut(styleIndex);
+        int shortcut = key - Qt::Key_0;
+        QRect ssRect(chipRect.center().x() - 8, chipRect.top() - 11, 16, 20);
+        p.setBrush(Qt::gray);
+        p.drawChord(ssRect, 0, -180 * 16);
+        tmpFont.setPointSize(6);
+        p.setFont(tmpFont);
+        p.drawText(ssRect.adjusted(0, 10, 0, 0), Qt::AlignCenter,
+                   QString().setNum(shortcut));
+      }
+
       // revert font set
       p.setFont(preFont);
       // revert brush
@@ -1372,6 +1427,15 @@ void PageViewer::onStyleRenamed() {
   PaletteCmd::renamePaletteStyle(getPaletteHandle(), newName);
 }
 
+//-----------------------------------------------------------------------------
+
+bool PageViewer::hasShortcut(int indexInPage) {
+  if (!m_page) return false;
+  if (indexInPage < 0 || indexInPage >= m_page->getStyleCount()) return false;
+  int styleIndex = m_page->getStyleId(indexInPage);
+  return (m_page->getPalette()->getStyleShortcut(styleIndex) >= 0);
+}
+
 //=============================================================================
 /*! \class PaletteViewerGUI::PaletteTabBar
                 \brief The PaletteTabBar class provides a bar with tab to show