diff --git a/qt/MakeDialog.cc b/qt/MakeDialog.cc
index 72fc879cd..dccfe561f 100644
--- a/qt/MakeDialog.cc
+++ b/qt/MakeDialog.cc
@@ -220,24 +220,14 @@ void MakeDialog::onSourceChanged()
         builder_.emplace(filename.toStdString());
     }
 
-    QString text;
-
     if (!builder_)
     {
-        text = tr("<i>No source selected</i>");
+        updatePiecesLabel();
     }
     else
     {
-        auto const files = tr("%Ln File(s)", nullptr, builder_->fileCount());
-        auto const pieces = tr("%Ln Piece(s)", nullptr, builder_->pieceCount());
-        text = tr("%1 in %2; %3 @ %4")
-                   .arg(Formatter::get().sizeToString(builder_->totalSize()))
-                   .arg(files)
-                   .arg(pieces)
-                   .arg(Formatter::get().sizeToString(static_cast<uint64_t>(builder_->pieceSize())));
+        ui_.pieceSizeSlider->setValue(log2(builder_->pieceSize()));
     }
-
-    ui_.sourceSizeLabel->setText(text);
 }
 
 MakeDialog::MakeDialog(Session& session, QWidget* parent)
@@ -266,6 +256,7 @@ MakeDialog::MakeDialog(Session& session, QWidget* parent)
 
     connect(ui_.dialogButtons, &QDialogButtonBox::accepted, this, &MakeDialog::makeTorrent);
     connect(ui_.dialogButtons, &QDialogButtonBox::rejected, this, &MakeDialog::close);
+    connect(ui_.pieceSizeSlider, &QSlider::valueChanged, this, &MakeDialog::onPieceSizeUpdated);
 
     onSourceChanged();
 }
@@ -303,3 +294,34 @@ void MakeDialog::dropEvent(QDropEvent* event)
         }
     }
 }
+
+void MakeDialog::updatePiecesLabel()
+{
+    QString text;
+
+    if (!builder_)
+    {
+        text = tr("<i>No source selected</i>");
+        ui_.pieceSizeSlider->setEnabled(false);
+    }
+    else
+    {
+        auto const files = tr("%Ln File(s)", nullptr, builder_->fileCount());
+        auto const pieces = tr("%Ln Piece(s)", nullptr, builder_->pieceCount());
+        text = tr("%1 in %2; %3 @ %4")
+                   .arg(Formatter::get().sizeToString(builder_->totalSize()))
+                   .arg(files)
+                   .arg(pieces)
+                   .arg(Formatter::get().memToString(static_cast<uint64_t>(builder_->pieceSize())));
+        ui_.pieceSizeSlider->setEnabled(true);
+    }
+
+    ui_.sourceSizeLabel->setText(text);
+}
+
+void MakeDialog::onPieceSizeUpdated(int value)
+{
+    auto new_size = static_cast<uint64_t>(pow(2, value));
+    builder_->setPieceSize(new_size);
+    updatePiecesLabel();
+}
diff --git a/qt/MakeDialog.h b/qt/MakeDialog.h
index 7414a2bd9..ff32f018b 100644
--- a/qt/MakeDialog.h
+++ b/qt/MakeDialog.h
@@ -32,10 +32,11 @@ protected:
 private slots:
     void onSourceChanged();
     void makeTorrent();
+    void onPieceSizeUpdated(int);
 
 private:
     QString getSource() const;
-
+    void updatePiecesLabel();
     Session& session_;
 
     Ui::MakeDialog ui_ = {};
diff --git a/qt/MakeDialog.ui b/qt/MakeDialog.ui
index a5f233fe1..c7c5c1210 100644
--- a/qt/MakeDialog.ui
+++ b/qt/MakeDialog.ui
@@ -79,6 +79,32 @@
        </property>
       </widget>
      </item>
+     <item row="4" column="1">
+      <widget class="QSlider" name="pieceSizeSlider">
+       <property name="minimum">
+        <number>10</number>
+       </property>
+       <property name="maximum">
+        <number>26</number>
+       </property>
+       <property name="pageStep">
+        <number>1</number>
+       </property>
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+      </widget>
+     </item>
+     <item row="4" column="0">
+      <widget class="QLabel" name="pieceSizeLabel">
+       <property name="text">
+        <string>Piece s&amp;ize:</string>
+       </property>
+       <property name="buddy">
+        <cstring>pieceSizeSlider</cstring>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
    <item>