diff --git a/src/app/qgsmaptoolsimplify.cpp b/src/app/qgsmaptoolsimplify.cpp
index ec3db5eb2d0..80177508070 100644
--- a/src/app/qgsmaptoolsimplify.cpp
+++ b/src/app/qgsmaptoolsimplify.cpp
@@ -13,6 +13,8 @@
  *                                                                         *
  ***************************************************************************/
 
+#include <QPushButton>
+
 #include "qgsmaptoolsimplify.h"
 
 #include "qgsfeatureiterator.h"
@@ -29,9 +31,8 @@
 #include <cmath>
 #include <cfloat>
 
-QgsSimplifyDialog::QgsSimplifyDialog( QgsMapToolSimplify *tool, QWidget *parent )
-  : QDialog( parent )
-  , mTool( tool )
+QgsSimplifyUserInputWidget::QgsSimplifyUserInputWidget( QWidget *parent )
+  : QWidget( parent )
 {
   setupUi( this );
 
@@ -40,55 +41,62 @@ QgsSimplifyDialog::QgsSimplifyDialog( QgsMapToolSimplify *tool, QWidget *parent
   mMethodComboBox->addItem( tr( "Simplify by area (Visvalingam)" ), QgsMapToolSimplify::SimplifyVisvalingam );
   mMethodComboBox->addItem( tr( "Smooth" ), QgsMapToolSimplify::Smooth );
 
-  spinTolerance->setValue( mTool->tolerance() );
-  spinTolerance->setShowClearButton( false );
-  cboToleranceUnits->setCurrentIndex( ( int ) mTool->toleranceUnits() );
+  mToleranceUnitsComboBox->addItem( tr( "Layer units" ), QgsTolerance::LayerUnits );
+  mToleranceUnitsComboBox->addItem( tr( "Pixels" ), QgsTolerance::Pixels );
+  mToleranceUnitsComboBox->addItem( tr( "Map units" ), QgsTolerance::ProjectUnits );
+
+  mSpinToleranceSpinBox->setShowClearButton( false );
 
   mOffsetSpin->setClearValue( 25 );
-  mOffsetSpin->setValue( mTool->smoothOffset() * 100 );
   mIterationsSpin->setClearValue( 1 );
-  mIterationsSpin->setValue( mTool->smoothIterations() );
-
-  mMethodComboBox->setCurrentIndex( mMethodComboBox->findData( mTool->method() ) );
   if ( mMethodComboBox->currentData().toInt() != QgsMapToolSimplify::Smooth )
     mOptionsStackedWidget->setCurrentIndex( 0 );
   else
     mOptionsStackedWidget->setCurrentIndex( 1 );
 
   // communication with map tool
-  connect( spinTolerance, static_cast < void ( QDoubleSpinBox::* )( double ) > ( &QDoubleSpinBox::valueChanged ), mTool, &QgsMapToolSimplify::setTolerance );
-  connect( cboToleranceUnits, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), mTool, &QgsMapToolSimplify::setToleranceUnits );
-  connect( mMethodComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), mTool, [ = ]
+  connect( mSpinToleranceSpinBox, static_cast < void ( QDoubleSpinBox::* )( double ) > ( &QDoubleSpinBox::valueChanged ), this, &QgsSimplifyUserInputWidget::toleranceChanged );
+  connect( mToleranceUnitsComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, [ = ]( const int index ) {emit toleranceUnitsChanged( ( QgsTolerance::UnitType )index );} );
+  connect( mMethodComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, [ = ]( const int method ) {emit methodChanged( ( QgsMapToolSimplify::Method )method );} );
+  connect( mMethodComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, [ = ]
   {
-    mTool->setMethod( static_cast< QgsMapToolSimplify::Method >( mMethodComboBox->currentData().toInt() ) );
     if ( mMethodComboBox->currentData().toInt() != QgsMapToolSimplify::Smooth )
       mOptionsStackedWidget->setCurrentIndex( 0 );
     else
       mOptionsStackedWidget->setCurrentIndex( 1 );
   } );
 
-  connect( mOffsetSpin, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), mTool, [ = ]( int value ) { mTool->setSmoothOffset( value / 100.0 ); } );
-  connect( mIterationsSpin, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), mTool, [ = ]( int value ) { mTool->setSmoothIterations( value ); } );
-  connect( okButton, &QAbstractButton::clicked, mTool, &QgsMapToolSimplify::storeSimplified );
+  connect( mOffsetSpin, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), this, [ = ]( const int offset ) {emit smoothOffsetChanged( offset / 100.0 );} );
+  connect( mIterationsSpin, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), this, &QgsSimplifyUserInputWidget::smoothIterationsChanged );
+
+  connect( mButtonBox, &QDialogButtonBox::accepted, this, &QgsSimplifyUserInputWidget::accepted );
+  connect( mButtonBox, &QDialogButtonBox::rejected, this, &QgsSimplifyUserInputWidget::rejected );
 }
 
-void QgsSimplifyDialog::updateStatusText()
+void QgsSimplifyUserInputWidget::setConfig( const QgsMapToolSimplify::Method &method,
+    const double &tolerance,
+    const QgsTolerance::UnitType &units,
+    const double &smoothOffset,
+    const int &smoothIterations )
 {
-  labelStatus->setText( mTool->statusText() );
+  mMethodComboBox->setCurrentIndex( mMethodComboBox->findData( method ) );
+
+  mSpinToleranceSpinBox->setValue( tolerance );
+  mToleranceUnitsComboBox->setCurrentIndex( mToleranceUnitsComboBox->findData( units ) );
+  mOffsetSpin->setValue( 100 * smoothOffset );
+  mIterationsSpin->setValue( smoothIterations );
 }
 
-void QgsSimplifyDialog::enableOkButton( bool enabled )
+void QgsSimplifyUserInputWidget::updateStatusText( const QString &text )
 {
-  okButton->setEnabled( enabled );
+  labelStatus->setText( text );
 }
 
-void QgsSimplifyDialog::closeEvent( QCloseEvent *e )
+void QgsSimplifyUserInputWidget::enableOkButton( bool enabled )
 {
-  QDialog::closeEvent( e );
-  mTool->clearSelection();
+  mButtonBox->button( QDialogButtonBox::Ok )->setEnabled( enabled );
 }
 
-
 ////////////////////////////////////////////////////////////////////////////
 
 
@@ -101,14 +109,11 @@ QgsMapToolSimplify::QgsMapToolSimplify( QgsMapCanvas *canvas )
   mMethod = static_cast< QgsMapToolSimplify::Method >( settings.value( QStringLiteral( "digitizing/simplify_method" ), 0 ).toInt() );
   mSmoothIterations = settings.value( QStringLiteral( "digitizing/smooth_iterations" ), 1 ).toInt();
   mSmoothOffset = settings.value( QStringLiteral( "digitizing/smooth_offset" ), 0.25 ).toDouble();
-
-  mSimplifyDialog = new QgsSimplifyDialog( this, canvas->topLevelWidget() );
 }
 
 QgsMapToolSimplify::~QgsMapToolSimplify()
 {
   clearSelection();
-  delete mSimplifyDialog;
 }
 
 
@@ -123,10 +128,8 @@ void QgsMapToolSimplify::setTolerance( double tolerance )
     updateSimplificationPreview();
 }
 
-void QgsMapToolSimplify::setToleranceUnits( int units )
+void QgsMapToolSimplify::setToleranceUnits( const QgsTolerance::UnitType &units )
 {
-  mToleranceUnits = ( QgsTolerance::UnitType ) units;
-
   QgsSettings settings;
   settings.setValue( QStringLiteral( "digitizing/simplify_tolerance_units" ), units );
 
@@ -156,8 +159,28 @@ void QgsMapToolSimplify::updateSimplificationPreview()
     ++i;
   }
 
-  mSimplifyDialog->updateStatusText();
-  mSimplifyDialog->enableOkButton( !mReducedHasErrors );
+  if ( mSimplifyUserWidget )
+  {
+    mSimplifyUserWidget->updateStatusText( statusText() );
+    mSimplifyUserWidget->enableOkButton( !mReducedHasErrors );
+  }
+}
+
+void QgsMapToolSimplify::createUserInputWidget()
+{
+  mSimplifyUserWidget = new QgsSimplifyUserInputWidget( );
+  mSimplifyUserWidget->setConfig( method(), tolerance(), toleranceUnits(), smoothOffset(), smoothIterations() );
+
+  connect( mSimplifyUserWidget, &QgsSimplifyUserInputWidget::methodChanged, this, &QgsMapToolSimplify::setMethod );
+  connect( mSimplifyUserWidget, &QgsSimplifyUserInputWidget::toleranceChanged, this, &QgsMapToolSimplify::setTolerance );
+  connect( mSimplifyUserWidget, &QgsSimplifyUserInputWidget::toleranceUnitsChanged, this, &QgsMapToolSimplify::setToleranceUnits );
+  connect( mSimplifyUserWidget, &QgsSimplifyUserInputWidget::smoothOffsetChanged, this, &QgsMapToolSimplify::setSmoothOffset );
+  connect( mSimplifyUserWidget, &QgsSimplifyUserInputWidget::smoothIterationsChanged, this, &QgsMapToolSimplify::setSmoothIterations );
+  connect( mSimplifyUserWidget, &QgsSimplifyUserInputWidget::accepted, this, &QgsMapToolSimplify::storeSimplified );
+  connect( mSimplifyUserWidget, &QgsSimplifyUserInputWidget::rejected, this, &QgsMapToolSimplify::clearSelection );
+
+  QgisApp::instance()->addUserInputWidget( mSimplifyUserWidget );
+  mSimplifyUserWidget->setFocus( Qt::TabFocusReason );
 }
 
 QgsGeometry QgsMapToolSimplify::processGeometry( const QgsGeometry &geometry, double tolerance ) const
@@ -295,10 +318,13 @@ void QgsMapToolSimplify::canvasMoveEvent( QgsMapMouseEvent *e )
 
 void QgsMapToolSimplify::canvasReleaseEvent( QgsMapMouseEvent *e )
 {
-  if ( e->button() != Qt::LeftButton )
+  if ( e->button() == Qt::RightButton )
+  {
+    clearSelection();
     return;
+  }
 
-  if ( !currentVectorLayer() )
+  if ( e->button() != Qt::LeftButton || !currentVectorLayer() )
     return;
 
   delete mSelectionRubberBand;
@@ -340,10 +366,8 @@ void QgsMapToolSimplify::canvasReleaseEvent( QgsMapMouseEvent *e )
     rb->show();
     mRubberBands << rb;
   }
+  createUserInputWidget();
   updateSimplificationPreview();
-
-  // show dialog as a non-modal window
-  mSimplifyDialog->show();
 }
 
 
@@ -399,7 +423,8 @@ void QgsMapToolSimplify::selectFeaturesInRect()
 void QgsMapToolSimplify::clearSelection()
 {
   mSelectedFeatures.clear();
-
+  delete mSimplifyUserWidget;
+  mSimplifyUserWidget = nullptr;
   qDeleteAll( mRubberBands );
   mRubberBands.clear();
 }
@@ -408,9 +433,6 @@ void QgsMapToolSimplify::deactivate()
 {
   delete mSelectionRubberBand;
   mSelectionRubberBand = nullptr;
-
-  if ( mSimplifyDialog->isVisible() )
-    mSimplifyDialog->close();
   clearSelection();
   QgsMapTool::deactivate();
 }
diff --git a/src/app/qgsmaptoolsimplify.h b/src/app/qgsmaptoolsimplify.h
index 40ff0a1628c..66e3add642b 100644
--- a/src/app/qgsmaptoolsimplify.h
+++ b/src/app/qgsmaptoolsimplify.h
@@ -27,27 +27,7 @@
 class QgsRubberBand;
 class QgsMapToolSimplify;
 class QgsCoordinateTransform;
-
-class APP_EXPORT QgsSimplifyDialog : public QDialog, private Ui::SimplifyLineDialog
-{
-    Q_OBJECT
-
-  public:
-
-    QgsSimplifyDialog( QgsMapToolSimplify *tool, QWidget *parent = nullptr );
-
-    void updateStatusText();
-    void enableOkButton( bool enabled );
-
-  protected:
-
-    //! Also cancels pending simplification
-    void closeEvent( QCloseEvent *e ) override;
-
-  private:
-    QgsMapToolSimplify *mTool = nullptr;
-
-};
+class QgsSimplifyUserInputWidget;
 
 
 //! Map tool to simplify line/polygon features
@@ -82,8 +62,6 @@ class APP_EXPORT QgsMapToolSimplify: public QgsMapToolEdit
 
     Method method() const;
 
-    void setMethod( Method method );
-
     int smoothIterations() const;
     void setSmoothIterations( int smoothIterations );
 
@@ -94,13 +72,15 @@ class APP_EXPORT QgsMapToolSimplify: public QgsMapToolEdit
     //! Slot to change display when slidebar is moved
     void setTolerance( double tolerance );
 
-    void setToleranceUnits( int units );
+    void setToleranceUnits( const QgsTolerance::UnitType &units );
 
     //! Slot to store feature after simplification
     void storeSimplified();
 
     void clearSelection();
 
+    void setMethod( Method method );
+
   private:
 
     void selectOneFeature( QPoint canvasPoint );
@@ -108,6 +88,8 @@ class APP_EXPORT QgsMapToolSimplify: public QgsMapToolEdit
 
     void updateSimplificationPreview();
 
+    void createUserInputWidget();
+
     /**
      * Simplifies a \a geometry to the specified \a tolerance, respecting the preset
      * simplification method.
@@ -116,7 +98,7 @@ class APP_EXPORT QgsMapToolSimplify: public QgsMapToolEdit
 
     // data
     //! Dialog with slider to set correct tolerance value
-    QgsSimplifyDialog *mSimplifyDialog = nullptr;
+    QgsSimplifyUserInputWidget *mSimplifyUserWidget = nullptr;
 
     //! Rubber bands to draw current state of simplification
     QList<QgsRubberBand *> mRubberBands;
@@ -143,6 +125,32 @@ class APP_EXPORT QgsMapToolSimplify: public QgsMapToolEdit
 
     int mSmoothIterations = 1;
     double mSmoothOffset = 0.25;
+};
+
+
+class APP_EXPORT QgsSimplifyUserInputWidget : public QWidget, private Ui::SimplifyUserInputWidgetBase
+{
+    Q_OBJECT
+
+  public:
+
+    QgsSimplifyUserInputWidget( QWidget *parent = nullptr );
+
+    void updateStatusText( const QString &text );
+    void enableOkButton( bool enabled );
+
+    void setConfig( const QgsMapToolSimplify::Method &method, const double &tolerance,
+                    const QgsTolerance::UnitType &units, const double &smoothOffset,
+                    const int &smoothIterations );
+
+  signals:
+    void accepted();
+    void rejected();
+    void toleranceChanged( double tolerance );
+    void toleranceUnitsChanged( QgsTolerance::UnitType units );
+    void methodChanged( QgsMapToolSimplify::Method method );
+    void smoothOffsetChanged( double offset );
+    void smoothIterationsChanged( int iterations );
 
 };
 
diff --git a/src/ui/qgssimplifytolerancedialog.ui b/src/ui/qgssimplifytolerancedialog.ui
index 468bc401fa2..ab9372f9714 100644
--- a/src/ui/qgssimplifytolerancedialog.ui
+++ b/src/ui/qgssimplifytolerancedialog.ui
@@ -1,32 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>SimplifyLineDialog</class>
- <widget class="QDialog" name="SimplifyLineDialog">
+ <class>SimplifyUserInputWidgetBase</class>
+ <widget class="QWidget" name="SimplifyUserInputWidgetBase">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>520</width>
-    <height>106</height>
+    <width>452</width>
+    <height>114</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Simplification Tool</string>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <item row="2" column="0" colspan="4">
+   <item row="2" column="0" colspan="5">
     <widget class="QLabel" name="labelStatus"/>
    </item>
-   <item row="0" column="1" colspan="2">
-    <widget class="QComboBox" name="mMethodComboBox"/>
-   </item>
-   <item row="0" column="3">
-    <widget class="QPushButton" name="okButton">
-     <property name="text">
-      <string>OK</string>
-     </property>
-    </widget>
-   </item>
    <item row="0" column="0">
     <widget class="QLabel" name="label_2">
      <property name="text">
@@ -34,10 +24,10 @@
      </property>
     </widget>
    </item>
-   <item row="1" column="0" colspan="4">
+   <item row="1" column="0" colspan="5">
     <widget class="QStackedWidget" name="mOptionsStackedWidget">
      <property name="currentIndex">
-      <number>1</number>
+      <number>0</number>
      </property>
      <widget class="QWidget" name="page">
       <layout class="QHBoxLayout" name="horizontalLayout" stretch="0,1,1">
@@ -61,7 +51,7 @@
         </widget>
        </item>
        <item>
-        <widget class="QgsDoubleSpinBox" name="spinTolerance">
+        <widget class="QgsDoubleSpinBox" name="mSpinToleranceSpinBox">
          <property name="decimals">
           <number>6</number>
          </property>
@@ -74,23 +64,7 @@
         </widget>
        </item>
        <item>
-        <widget class="QComboBox" name="cboToleranceUnits">
-         <item>
-          <property name="text">
-           <string>Layer units</string>
-          </property>
-         </item>
-         <item>
-          <property name="text">
-           <string>Pixels</string>
-          </property>
-         </item>
-         <item>
-          <property name="text">
-           <string>Map units</string>
-          </property>
-         </item>
-        </widget>
+        <widget class="QComboBox" name="mToleranceUnitsComboBox"/>
        </item>
       </layout>
      </widget>
@@ -155,6 +129,16 @@
      </widget>
     </widget>
    </item>
+   <item row="0" column="1" colspan="2">
+    <widget class="QComboBox" name="mMethodComboBox"/>
+   </item>
+   <item row="0" column="3">
+    <widget class="QDialogButtonBox" name="mButtonBox">
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <customwidgets>
@@ -171,25 +155,7 @@
  </customwidgets>
  <tabstops>
   <tabstop>mMethodComboBox</tabstop>
-  <tabstop>okButton</tabstop>
  </tabstops>
  <resources/>
- <connections>
-  <connection>
-   <sender>okButton</sender>
-   <signal>clicked()</signal>
-   <receiver>SimplifyLineDialog</receiver>
-   <slot>accept()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>390</x>
-     <y>24</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>236</x>
-     <y>30</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
+ <connections/>
 </ui>