diff --git a/qt/OpenRGBZoneResizeDialog.cpp b/qt/OpenRGBZoneResizeDialog.cpp
index 30c5d35d..12599fae 100644
--- a/qt/OpenRGBZoneResizeDialog.cpp
+++ b/qt/OpenRGBZoneResizeDialog.cpp
@@ -17,6 +17,10 @@ OpenRGBZoneResizeDialog::OpenRGBZoneResizeDialog(RGBController* edit_dev_ptr, un
 
     ui->setupUi(this);
 
+    QStringList header_labels;
+    header_labels << "Name" << "Size" << "";
+    ui->SegmentsTreeWidget->setHeaderLabels(header_labels);
+
     ui->ResizeSlider->setRange(size_min, size_max);
     ui->ResizeBox->setRange(size_min, size_max);
 
@@ -25,19 +29,24 @@ OpenRGBZoneResizeDialog::OpenRGBZoneResizeDialog(RGBController* edit_dev_ptr, un
 
     for(unsigned int segment_idx = 0; segment_idx < edit_dev->zones[edit_zone_idx].segments.size(); segment_idx++)
     {
-        QTreeWidgetItem* new_item = new QTreeWidgetItem(ui->SegmentsTreeWidget);
+        QTreeWidgetItem* new_item   = new QTreeWidgetItem(ui->SegmentsTreeWidget);
 
-        QLineEdit* lineedit_name = new QLineEdit(ui->SegmentsTreeWidget);
-        QLineEdit* lineedit_start = new QLineEdit(ui->SegmentsTreeWidget);
-        QLineEdit* lineedit_length = new QLineEdit(ui->SegmentsTreeWidget);
+        QLineEdit* lineedit_name    = new QLineEdit(ui->SegmentsTreeWidget);
+        QLineEdit* lineedit_length  = new QLineEdit(ui->SegmentsTreeWidget);
+        QSlider*   slider_length    = new QSlider(Qt::Horizontal, ui->SegmentsTreeWidget);
+
+        slider_length->setMaximum(edit_dev->zones[edit_zone_idx].leds_count);
 
         lineedit_name->setText(QString::fromStdString(edit_dev->zones[edit_zone_idx].segments[segment_idx].name));
-        lineedit_start->setText(QString::number(edit_dev->zones[edit_zone_idx].segments[segment_idx].start_idx));
         lineedit_length->setText(QString::number(edit_dev->zones[edit_zone_idx].segments[segment_idx].leds_count));
+        slider_length->setSliderPosition(edit_dev->zones[edit_zone_idx].segments[segment_idx].leds_count);
 
         ui->SegmentsTreeWidget->setItemWidget(new_item, 0, lineedit_name);
-        ui->SegmentsTreeWidget->setItemWidget(new_item, 1, lineedit_start);
-        ui->SegmentsTreeWidget->setItemWidget(new_item, 2, lineedit_length);
+        ui->SegmentsTreeWidget->setItemWidget(new_item, 1, lineedit_length);
+        ui->SegmentsTreeWidget->setItemWidget(new_item, 2, slider_length);
+
+        connect(slider_length, &QSlider::valueChanged, this, &OpenRGBZoneResizeDialog::on_segment_slider_valueChanged);
+        connect(lineedit_length, &QLineEdit::textChanged, this, &OpenRGBZoneResizeDialog::on_segment_lineedit_textChanged);
     }
 }
 
@@ -59,6 +68,47 @@ void Ui::OpenRGBZoneResizeDialog::on_ResizeSlider_valueChanged(int value)
     ui->ResizeBox->blockSignals(true);
     ui->ResizeBox->setValue(value);
     ui->ResizeBox->blockSignals(false);
+
+    /*-----------------------------------------------------*\
+    | Set maximum value for all segment sliders to new zone |
+    | size                                                  |
+    \*-----------------------------------------------------*/
+    for(unsigned int item_idx = 0; item_idx < ui->SegmentsTreeWidget->topLevelItemCount(); item_idx++)
+    {
+        ((QSlider*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 2))->setMaximum(value);
+    }
+
+    CheckSegmentsValidity();
+}
+
+void Ui::OpenRGBZoneResizeDialog::on_segment_lineedit_textChanged()
+{
+    /*-----------------------------------------------------*\
+    | Update the Slider with the LineEdit value for each    |
+    | segment                                               |
+    \*-----------------------------------------------------*/
+    for(unsigned int item_idx = 0; item_idx < ui->SegmentsTreeWidget->topLevelItemCount(); item_idx++)
+    {
+        int lineedit_value = ((QLineEdit*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 1))->text().toInt();
+        ((QSlider*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 2))->setValue(lineedit_value);
+    }
+
+    CheckSegmentsValidity();
+}
+
+void Ui::OpenRGBZoneResizeDialog::on_segment_slider_valueChanged(int)
+{
+    /*-----------------------------------------------------*\
+    | Update the LineEdit with the Slider value for each    |
+    | segment                                               |
+    \*-----------------------------------------------------*/
+    for(unsigned int item_idx = 0; item_idx < ui->SegmentsTreeWidget->topLevelItemCount(); item_idx++)
+    {
+        int slider_value = ((QSlider*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 2))->value();
+        ((QLineEdit*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 1))->setText(QString::number(slider_value));
+    }
+
+    CheckSegmentsValidity();
 }
 
 void Ui::OpenRGBZoneResizeDialog::on_ResizeBox_valueChanged(int value)
@@ -66,6 +116,17 @@ void Ui::OpenRGBZoneResizeDialog::on_ResizeBox_valueChanged(int value)
     ui->ResizeSlider->blockSignals(true);
     ui->ResizeSlider->setValue(value);
     ui->ResizeSlider->blockSignals(false);
+
+    /*-----------------------------------------------------*\
+    | Set maximum value for all segment sliders to new zone |
+    | size                                                  |
+    \*-----------------------------------------------------*/
+    for(unsigned int item_idx = 0; item_idx < ui->SegmentsTreeWidget->topLevelItemCount(); item_idx++)
+    {
+        ((QSlider*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 2))->setMaximum(value);
+    }
+
+    CheckSegmentsValidity();
 }
 
 int Ui::OpenRGBZoneResizeDialog::show()
@@ -89,15 +150,19 @@ int Ui::OpenRGBZoneResizeDialog::show()
 
         edit_dev->zones[edit_zone_idx].segments.clear();
 
+        unsigned int start_idx = 0;
+
         for(unsigned int item_idx = 0; item_idx < ui->SegmentsTreeWidget->topLevelItemCount(); item_idx++)
         {
             segment new_segment;
             new_segment.type       = ZONE_TYPE_LINEAR;
             new_segment.name       = ((QLineEdit*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 0))->text().toStdString();
-            new_segment.start_idx  = ((QLineEdit*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 1))->text().toInt();
-            new_segment.leds_count = ((QLineEdit*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 2))->text().toInt();
+            new_segment.start_idx  = start_idx;
+            new_segment.leds_count = ((QLineEdit*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(item_idx), 1))->text().toInt();
 
             edit_dev->zones[edit_zone_idx].segments.push_back(new_segment);
+
+            start_idx += new_segment.leds_count;
         }
     }
 
@@ -106,20 +171,65 @@ int Ui::OpenRGBZoneResizeDialog::show()
 
 void Ui::OpenRGBZoneResizeDialog::on_AddSegmentButton_clicked()
 {
-	QTreeWidgetItem* new_item = new QTreeWidgetItem(ui->SegmentsTreeWidget);
-    
-    QLineEdit* lineedit_name = new QLineEdit(ui->SegmentsTreeWidget);
-    QLineEdit* lineedit_start = new QLineEdit(ui->SegmentsTreeWidget);
-    QLineEdit* lineedit_length = new QLineEdit(ui->SegmentsTreeWidget);
+    QTreeWidgetItem* new_item   = new QTreeWidgetItem(ui->SegmentsTreeWidget);
+
+    QLineEdit* lineedit_name    = new QLineEdit(ui->SegmentsTreeWidget);
+    QLineEdit* lineedit_length  = new QLineEdit(ui->SegmentsTreeWidget);
+    QSlider*   slider_length    = new QSlider(Qt::Horizontal, ui->SegmentsTreeWidget);
+
+    slider_length->setMaximum(edit_dev->zones[edit_zone_idx].leds_count);
 
     ui->SegmentsTreeWidget->setItemWidget(new_item, 0, lineedit_name);
-    ui->SegmentsTreeWidget->setItemWidget(new_item, 1, lineedit_start);
-    ui->SegmentsTreeWidget->setItemWidget(new_item, 2, lineedit_length);
+    ui->SegmentsTreeWidget->setItemWidget(new_item, 1, lineedit_length);
+    ui->SegmentsTreeWidget->setItemWidget(new_item, 2, slider_length);
+
+    connect(slider_length, &QSlider::valueChanged, this, &OpenRGBZoneResizeDialog::on_segment_slider_valueChanged);
+    connect(lineedit_length, &QLineEdit::textChanged, this, &OpenRGBZoneResizeDialog::on_segment_lineedit_textChanged);
+
+    CheckSegmentsValidity();
 }
 
+void Ui::OpenRGBZoneResizeDialog::CheckSegmentsValidity()
+{
+    bool segments_valid = true;
+
+    /*---------------------------------------------------------*\
+    | Only check validity if segments are configured            |
+    \*---------------------------------------------------------*/
+    if(ui->SegmentsTreeWidget->topLevelItemCount() != 0)
+    {
+        /*-----------------------------------------------------*\
+        | Verify all segments add up to zone size               |
+        \*-----------------------------------------------------*/
+        unsigned int total_segment_leds = 0;
+
+        for(unsigned int segment_idx = 0; segment_idx < ui->SegmentsTreeWidget->topLevelItemCount(); segment_idx++)
+        {
+            unsigned int segment_leds = ((QLineEdit*)ui->SegmentsTreeWidget->itemWidget(ui->SegmentsTreeWidget->topLevelItem(segment_idx), 1))->text().toInt();
+
+            /*-------------------------------------------------*\
+            | Zero-length segment is not allowed                |
+            \*-------------------------------------------------*/
+            if(segment_leds == 0)
+            {
+                segments_valid = false;
+            }
+
+            total_segment_leds += segment_leds;
+        }
+
+        if(total_segment_leds != ui->ResizeBox->value())
+        {
+            segments_valid = false;
+        }
+    }
+
+    ui->ButtonBox->setEnabled(segments_valid);
+}
 
 void Ui::OpenRGBZoneResizeDialog::on_RemoveSegmentButton_clicked()
 {
     ui->SegmentsTreeWidget->takeTopLevelItem(ui->SegmentsTreeWidget->topLevelItemCount() - 1);
-}
 
+    CheckSegmentsValidity();
+}
diff --git a/qt/OpenRGBZoneResizeDialog.h b/qt/OpenRGBZoneResizeDialog.h
index 35b79367..2320e7e3 100644
--- a/qt/OpenRGBZoneResizeDialog.h
+++ b/qt/OpenRGBZoneResizeDialog.h
@@ -30,10 +30,16 @@ private slots:
 
     void on_RemoveSegmentButton_clicked();
 
+    void on_segment_slider_valueChanged(int);
+
+    void on_segment_lineedit_textChanged();
+
 private:
     Ui::OpenRGBZoneResizeDialogUi *ui;
     RGBController* edit_dev;
     unsigned int edit_zone_idx;
+
+    void CheckSegmentsValidity();
 };
 
 #endif // OPENRGBZONERESIZEDIALOG_H
diff --git a/qt/OpenRGBZoneResizeDialog.ui b/qt/OpenRGBZoneResizeDialog.ui
index de24607b..350a5ccc 100644
--- a/qt/OpenRGBZoneResizeDialog.ui
+++ b/qt/OpenRGBZoneResizeDialog.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>340</width>
-    <height>187</height>
+    <width>450</width>
+    <height>250</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -57,18 +57,18 @@
      </column>
      <column>
       <property name="text">
-       <string>Start</string>
+       <string>Length</string>
       </property>
      </column>
      <column>
       <property name="text">
-       <string>Length</string>
+       <string> </string>
       </property>
      </column>
     </widget>
    </item>
    <item row="4" column="0" colspan="2">
-    <widget class="QDialogButtonBox" name="buttonBox">
+    <widget class="QDialogButtonBox" name="ButtonBox">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
        <horstretch>0</horstretch>
@@ -105,7 +105,7 @@
  <resources/>
  <connections>
   <connection>
-   <sender>buttonBox</sender>
+   <sender>ButtonBox</sender>
    <signal>accepted()</signal>
    <receiver>OpenRGBZoneResizeDialogUi</receiver>
    <slot>accept()</slot>
@@ -121,7 +121,7 @@
    </hints>
   </connection>
   <connection>
-   <sender>buttonBox</sender>
+   <sender>ButtonBox</sender>
    <signal>rejected()</signal>
    <receiver>OpenRGBZoneResizeDialogUi</receiver>
    <slot>reject()</slot>