diff --git a/extras/AudioPerformanceTest/Source/Main.cpp b/extras/AudioPerformanceTest/Source/Main.cpp
index f0b6915fe6..2a6f893be6 100644
--- a/extras/AudioPerformanceTest/Source/Main.cpp
+++ b/extras/AudioPerformanceTest/Source/Main.cpp
@@ -53,9 +53,8 @@ public:
     class MainWindow    : public DocumentWindow
     {
     public:
-        MainWindow (String name)  : DocumentWindow (name,
-                                                    Colours::lightgrey,
-                                                    DocumentWindow::allButtons)
+        explicit MainWindow (String name)
+            : DocumentWindow (name, Colours::lightgrey, DocumentWindow::allButtons)
         {
             setUsingNativeTitleBar (true);
             setContentOwned (createMainContentComponent(), true);
diff --git a/extras/AudioPerformanceTest/Source/MainComponent.h b/extras/AudioPerformanceTest/Source/MainComponent.h
index 738ce59369..6ba98b36e0 100644
--- a/extras/AudioPerformanceTest/Source/MainComponent.h
+++ b/extras/AudioPerformanceTest/Source/MainComponent.h
@@ -37,7 +37,7 @@ public:
         startTimer (1000);
     }
 
-    ~MainContentComponent()
+    ~MainContentComponent() override
     {
         shutdownAudio();
     }
@@ -46,7 +46,7 @@ public:
     void prepareToPlay (int bufferSize, double sampleRate) override
     {
         currentSampleRate = sampleRate;
-        allocateBuffers (bufferSize);
+        allocateBuffers (static_cast<size_t> (bufferSize));
         printHeader();
     }
 
diff --git a/extras/AudioPluginHost/Source/UI/GraphEditorPanel.cpp b/extras/AudioPluginHost/Source/UI/GraphEditorPanel.cpp
index c892ef3935..8b6e4ccae6 100644
--- a/extras/AudioPluginHost/Source/UI/GraphEditorPanel.cpp
+++ b/extras/AudioPluginHost/Source/UI/GraphEditorPanel.cpp
@@ -502,7 +502,8 @@ struct GraphEditorPanel::PluginComponent   : public Component,
 struct GraphEditorPanel::ConnectorComponent   : public Component,
                                                 public SettableTooltipClient
 {
-    ConnectorComponent (GraphEditorPanel& p) : panel (p), graph (p.graph)
+    explicit ConnectorComponent (GraphEditorPanel& p)
+        : panel (p), graph (p.graph)
     {
         setAlwaysOnTop (true);
     }
@@ -986,7 +987,7 @@ class GraphDocumentComponent::TitleBarComponent    : public Component,
                                                      private Button::Listener
 {
 public:
-    TitleBarComponent (GraphDocumentComponent& graphDocumentComponent)
+    explicit TitleBarComponent (GraphDocumentComponent& graphDocumentComponent)
         : owner (graphDocumentComponent)
     {
         static const unsigned char burgerMenuPathData[]
diff --git a/extras/NetworkGraphicsDemo/Source/Demos.h b/extras/NetworkGraphicsDemo/Source/Demos.h
index ae59bda376..4bbdbd41c8 100644
--- a/extras/NetworkGraphicsDemo/Source/Demos.h
+++ b/extras/NetworkGraphicsDemo/Source/Demos.h
@@ -83,7 +83,7 @@ struct BackgroundLogo  : public AnimatedContent
     void reset() override {}
     void handleTouch (Point<float>) override {}
 
-    void generateCanvas (Graphics& g, SharedCanvasDescription& canvas, Rectangle<float> activeArea) override
+    void generateCanvas (Graphics& g, SharedCanvasDescription& canvas, Rectangle<float>) override
     {
         logo->drawWithin (g, canvas.getLimits().reduced (3.0f), RectanglePlacement (RectanglePlacement::centred), 0.6f);
     }
@@ -465,7 +465,7 @@ struct MultiLogo  : public BackgroundLogo
 {
     String getName() const override      { return "Multi-Logo " + String ((int) numHorizontalLogos); }
 
-    void generateCanvas (Graphics& g, SharedCanvasDescription& canvas, Rectangle<float> activeArea) override
+    void generateCanvas (Graphics& g, SharedCanvasDescription& canvas, Rectangle<float>) override
     {
         float indent = 0.5f;
         float logoSize = canvas.getLimits().getWidth() / numHorizontalLogos;
diff --git a/extras/NetworkGraphicsDemo/Source/Main.cpp b/extras/NetworkGraphicsDemo/Source/Main.cpp
index 130e42ae95..5dc53bbffd 100644
--- a/extras/NetworkGraphicsDemo/Source/Main.cpp
+++ b/extras/NetworkGraphicsDemo/Source/Main.cpp
@@ -31,7 +31,7 @@ namespace
     static const String canvasStateOSCAddress = "/juce/nfd/canvasState";
     static const String newClientOSCAddress   = "/juce/nfd/newClient";
     static const String userInputOSCAddress   = "/juce/nfd/userInput";
-};
+}
 
 #include "SharedCanvas.h"
 #include "SlaveComponent.h"
@@ -84,7 +84,7 @@ public:
     //==============================================================================
     struct MainWindow    : public DocumentWindow
     {
-        MainWindow (PropertiesFile& props)
+        explicit MainWindow (PropertiesFile& props)
             : DocumentWindow ("JUCE Networked Graphics Demo - Master", Colours::white, DocumentWindow::allButtons)
         {
             setUsingNativeTitleBar (true);
@@ -114,7 +114,7 @@ public:
            #endif
         }
 
-        ~MainWindow()
+        ~MainWindow() override
         {
             glContext.detach();
         }
diff --git a/extras/NetworkGraphicsDemo/Source/MasterComponent.h b/extras/NetworkGraphicsDemo/Source/MasterComponent.h
index a30d574706..b79070d062 100644
--- a/extras/NetworkGraphicsDemo/Source/MasterComponent.h
+++ b/extras/NetworkGraphicsDemo/Source/MasterComponent.h
@@ -48,7 +48,7 @@ struct MasterContentComponent  : public Component,
         startTimerHz (30);
     }
 
-    ~MasterContentComponent()
+    ~MasterContentComponent() override
     {
         OSCReceiver::removeListener (this);
     }
diff --git a/extras/NetworkGraphicsDemo/Source/SharedCanvas.h b/extras/NetworkGraphicsDemo/Source/SharedCanvas.h
index c0291de21b..63bdf0325a 100644
--- a/extras/NetworkGraphicsDemo/Source/SharedCanvas.h
+++ b/extras/NetworkGraphicsDemo/Source/SharedCanvas.h
@@ -447,9 +447,9 @@ struct BlockPacketiser
 
         while (remaining > 0)
         {
-            auto num = (int) jmin (maxBlockSize, remaining);
-            blocks.add (MemoryBlock (addBytesToPointer (data.getData(), offset), (size_t) num));
-            offset += num;
+            auto num = (size_t) jmin (maxBlockSize, remaining);
+            blocks.add (MemoryBlock (addBytesToPointer (data.getData(), offset), num));
+            offset += (int) num;
             remaining -= num;
         }
 
@@ -459,7 +459,7 @@ struct BlockPacketiser
 
         for (int i = 0; i < blocks.size(); ++i)
         {
-            uint32 index = ByteOrder::swapIfBigEndian (i);
+            auto index = (uint32) ByteOrder::swapIfBigEndian (i);
             blocks.getReference(i).append (&index, sizeof (index));
         }
     }
@@ -497,9 +497,9 @@ struct BlockPacketiser
 
     static int compareElements (const MemoryBlock& b1, const MemoryBlock& b2)
     {
-        int i1 = ByteOrder::littleEndianInt (addBytesToPointer (b1.getData(), b1.getSize() - 4));
-        int i2 = ByteOrder::littleEndianInt (addBytesToPointer (b2.getData(), b2.getSize() - 4));
-        return i1 - i2;
+        auto i1 = ByteOrder::littleEndianInt (addBytesToPointer (b1.getData(), b1.getSize() - 4));
+        auto i2 = ByteOrder::littleEndianInt (addBytesToPointer (b2.getData(), b2.getSize() - 4));
+        return (int) (i1 - i2);
     }
 
     static const char* getLastPacketPrefix()   { return "**END_OF_PACKET_LIST** "; }
diff --git a/extras/NetworkGraphicsDemo/Source/SlaveComponent.h b/extras/NetworkGraphicsDemo/Source/SlaveComponent.h
index 7c29ae493a..5b4ea29554 100644
--- a/extras/NetworkGraphicsDemo/Source/SlaveComponent.h
+++ b/extras/NetworkGraphicsDemo/Source/SlaveComponent.h
@@ -58,7 +58,7 @@ public:
         startTimer (2000);
     }
 
-    ~SlaveCanvasComponent()
+    ~SlaveCanvasComponent() override
     {
         OSCReceiver::removeListener (this);
     }
diff --git a/extras/Projucer/Source/Application/jucer_AutoUpdater.cpp b/extras/Projucer/Source/Application/jucer_AutoUpdater.cpp
index ea252e9219..400c05a44a 100644
--- a/extras/Projucer/Source/Application/jucer_AutoUpdater.cpp
+++ b/extras/Projucer/Source/Application/jucer_AutoUpdater.cpp
@@ -412,7 +412,7 @@ private:
 
         struct ScopedDownloadFolder
         {
-            ScopedDownloadFolder (const File& installTargetFolder)
+            explicit ScopedDownloadFolder (const File& installTargetFolder)
             {
                 folder = installTargetFolder.getSiblingFile (installTargetFolder.getFileNameWithoutExtension() + "_download").getNonexistentSibling();
                 jassert (folder.createDirectory());
diff --git a/extras/Projucer/Source/Application/jucer_CommandLine.cpp b/extras/Projucer/Source/Application/jucer_CommandLine.cpp
index cb4b28dd95..c3b74c838f 100644
--- a/extras/Projucer/Source/Application/jucer_CommandLine.cpp
+++ b/extras/Projucer/Source/Application/jucer_CommandLine.cpp
@@ -63,7 +63,7 @@ namespace
     //==============================================================================
     struct LoadedProject
     {
-        LoadedProject (const ArgumentList::Argument& fileToLoad)
+        explicit LoadedProject (const ArgumentList::Argument& fileToLoad)
         {
             hideDockIcon();
 
diff --git a/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_ColouredElement.cpp b/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_ColouredElement.cpp
index c3ee97ffb7..7fee58a2a4 100644
--- a/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_ColouredElement.cpp
+++ b/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_ColouredElement.cpp
@@ -205,7 +205,7 @@ private:
 class EnableStrokeProperty : public BooleanPropertyComponent
 {
 public:
-    EnableStrokeProperty (ColouredElement* const owner_)
+    explicit EnableStrokeProperty (ColouredElement* const owner_)
         : BooleanPropertyComponent ("outline", "Outline enabled", "No outline"),
           listener (owner_)
     {
@@ -223,7 +223,7 @@ public:
 class StrokeThicknessProperty   : public SliderPropertyComponent
 {
 public:
-    StrokeThicknessProperty (ColouredElement* const owner_)
+    explicit StrokeThicknessProperty (ColouredElement* const owner_)
         : SliderPropertyComponent ("outline thickness", 0.1, 200.0, 0.1, 0.3),
           listener (owner_)
     {
@@ -249,7 +249,7 @@ public:
 class StrokeJointProperty : public ChoicePropertyComponent
 {
 public:
-    StrokeJointProperty (ColouredElement* const owner_)
+    explicit StrokeJointProperty (ColouredElement* const owner_)
         : ChoicePropertyComponent ("joint style"),
           listener (owner_)
     {
@@ -294,7 +294,7 @@ public:
 class StrokeEndCapProperty   : public ChoicePropertyComponent
 {
 public:
-    StrokeEndCapProperty (ColouredElement* const owner_)
+    explicit StrokeEndCapProperty (ColouredElement* const owner_)
         : ChoicePropertyComponent ("end-cap style"),
           listener (owner_)
     {
diff --git a/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_PaintElementPath.cpp b/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_PaintElementPath.cpp
index 9d8ce576bd..4725b3afdd 100644
--- a/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_PaintElementPath.cpp
+++ b/extras/Projucer/Source/ComponentEditor/PaintElements/jucer_PaintElementPath.cpp
@@ -94,7 +94,7 @@ class PathWindingModeProperty    : public ChoicePropertyComponent,
                                    public ChangeListener
 {
 public:
-    PathWindingModeProperty (PaintElementPath* const owner_)
+    explicit PathWindingModeProperty (PaintElementPath* const owner_)
         : ChoicePropertyComponent ("winding rule"),
           owner (owner_)
     {
diff --git a/extras/Projucer/Source/ComponentEditor/UI/jucer_EditingPanelBase.cpp b/extras/Projucer/Source/ComponentEditor/UI/jucer_EditingPanelBase.cpp
index c319355cf9..8e5b7b8441 100644
--- a/extras/Projucer/Source/ComponentEditor/UI/jucer_EditingPanelBase.cpp
+++ b/extras/Projucer/Source/ComponentEditor/UI/jucer_EditingPanelBase.cpp
@@ -24,7 +24,7 @@
 class EditingPanelBase::MagnifierComponent  : public Component
 {
 public:
-    MagnifierComponent (Component* c) : content (c)
+    explicit MagnifierComponent (Component* c) : content (c)
     {
         addAndMakeVisible (content.get());
         childBoundsChanged (content.get());
@@ -53,7 +53,7 @@ private:
 class ZoomingViewport   : public Viewport
 {
 public:
-    ZoomingViewport (EditingPanelBase* p) : panel (p)
+    explicit ZoomingViewport (EditingPanelBase* p) : panel (p)
     {
     }
 
diff --git a/extras/Projucer/Source/ComponentEditor/UI/jucer_JucerDocumentEditor.cpp b/extras/Projucer/Source/ComponentEditor/UI/jucer_JucerDocumentEditor.cpp
index 81465da5f5..7bed489ec6 100644
--- a/extras/Projucer/Source/ComponentEditor/UI/jucer_JucerDocumentEditor.cpp
+++ b/extras/Projucer/Source/ComponentEditor/UI/jucer_JucerDocumentEditor.cpp
@@ -130,7 +130,7 @@ class ClassPropertiesPanel  : public Component,
                               private ChangeListener
 {
 public:
-    ClassPropertiesPanel (JucerDocument& doc)
+    explicit ClassPropertiesPanel (JucerDocument& doc)
         : document (doc)
     {
         addAndMakeVisible (panel1);
@@ -188,7 +188,7 @@ private:
     class ComponentClassNameProperty    : public ComponentTextProperty <Component>
     {
     public:
-        ComponentClassNameProperty (JucerDocument& doc)
+        explicit ComponentClassNameProperty (JucerDocument& doc)
             : ComponentTextProperty<Component> ("Class name", 128, false, nullptr, doc)
         {}
 
@@ -200,7 +200,7 @@ private:
     class ComponentCompNameProperty    : public ComponentTextProperty <Component>
     {
     public:
-        ComponentCompNameProperty (JucerDocument& doc)
+        explicit ComponentCompNameProperty (JucerDocument& doc)
             : ComponentTextProperty<Component> ("Component name", 200, false, nullptr, doc)
         {}
 
@@ -212,7 +212,7 @@ private:
     class ComponentParentClassesProperty    : public ComponentTextProperty <Component>
     {
     public:
-        ComponentParentClassesProperty (JucerDocument& doc)
+        explicit ComponentParentClassesProperty (JucerDocument& doc)
             : ComponentTextProperty<Component> ("Parent classes", 512, false, nullptr, doc)
         {}
 
@@ -224,7 +224,7 @@ private:
     class ComponentConstructorParamsProperty    : public ComponentTextProperty <Component>
     {
     public:
-        ComponentConstructorParamsProperty (JucerDocument& doc)
+        explicit ComponentConstructorParamsProperty (JucerDocument& doc)
             : ComponentTextProperty<Component> ("Constructor params", 2048, false, nullptr, doc)
         {}
 
@@ -236,7 +236,7 @@ private:
     class ComponentInitialisersProperty   : public ComponentTextProperty <Component>
     {
     public:
-        ComponentInitialisersProperty (JucerDocument& doc)
+        explicit ComponentInitialisersProperty (JucerDocument& doc)
             : ComponentTextProperty <Component> ("Member initialisers", 16384, true, nullptr, doc)
         {
             preferredHeight = 24 * 3;
@@ -280,7 +280,7 @@ private:
     class FixedSizeProperty    : public ComponentChoiceProperty <Component>
     {
     public:
-        FixedSizeProperty (JucerDocument& doc)
+        explicit FixedSizeProperty (JucerDocument& doc)
             : ComponentChoiceProperty<Component> ("Fixed size", nullptr, doc)
         {
             choices.add ("Resize component to fit workspace");
@@ -295,7 +295,7 @@ private:
     class TemplateFileProperty    : public ComponentTextProperty <Component>
     {
     public:
-        TemplateFileProperty (JucerDocument& doc)
+        explicit TemplateFileProperty (JucerDocument& doc)
             : ComponentTextProperty<Component> ("Template file", 2048, false, nullptr, doc)
         {}
 
diff --git a/extras/Projucer/Source/ComponentEditor/UI/jucer_ResourceEditorPanel.cpp b/extras/Projucer/Source/ComponentEditor/UI/jucer_ResourceEditorPanel.cpp
index 1853dbb105..e06df631ae 100644
--- a/extras/Projucer/Source/ComponentEditor/UI/jucer_ResourceEditorPanel.cpp
+++ b/extras/Projucer/Source/ComponentEditor/UI/jucer_ResourceEditorPanel.cpp
@@ -23,7 +23,7 @@
 class ResourceListButton  : public Component
 {
 public:
-    ResourceListButton (JucerDocument& doc)
+    explicit ResourceListButton (JucerDocument& doc)
         : document (doc), reloadButton ("Reload"), row (0)
     {
         setInterceptsMouseClicks (false, true);
diff --git a/extras/Projucer/Source/ComponentEditor/jucer_JucerDocument.cpp b/extras/Projucer/Source/ComponentEditor/jucer_JucerDocument.cpp
index bfe17b91a0..578185183c 100644
--- a/extras/Projucer/Source/ComponentEditor/jucer_JucerDocument.cpp
+++ b/extras/Projucer/Source/ComponentEditor/jucer_JucerDocument.cpp
@@ -59,7 +59,7 @@ void JucerDocument::changed()
 
 struct UserDocChangeTimer  : public Timer
 {
-    UserDocChangeTimer (JucerDocument& d) : doc (d) {}
+    explicit UserDocChangeTimer (JucerDocument& d) : doc (d) {}
     void timerCallback() override       { doc.reloadFromDocument(); }
 
     JucerDocument& doc;
diff --git a/extras/Projucer/Source/ComponentEditor/jucer_PaintRoutine.cpp b/extras/Projucer/Source/ComponentEditor/jucer_PaintRoutine.cpp
index 137ad914e3..4846146032 100644
--- a/extras/Projucer/Source/ComponentEditor/jucer_PaintRoutine.cpp
+++ b/extras/Projucer/Source/ComponentEditor/jucer_PaintRoutine.cpp
@@ -157,7 +157,7 @@ PaintElement* PaintRoutine::addNewElement (PaintElement* e, const int index, con
 class DeleteElementAction   : public PaintElementUndoableAction <PaintElement>
 {
 public:
-    DeleteElementAction (PaintElement* const element)
+    explicit DeleteElementAction (PaintElement* const element)
         : PaintElementUndoableAction <PaintElement> (element),
           oldIndex (-1)
     {
diff --git a/extras/Projucer/Source/LiveBuildEngine/jucer_CompileEngineClient.cpp b/extras/Projucer/Source/LiveBuildEngine/jucer_CompileEngineClient.cpp
index f968d41106..1f0e62be66 100644
--- a/extras/Projucer/Source/LiveBuildEngine/jucer_CompileEngineClient.cpp
+++ b/extras/Projucer/Source/LiveBuildEngine/jucer_CompileEngineClient.cpp
@@ -62,7 +62,7 @@ class ClientIPC  : public MessageHandler,
                    private Timer
 {
 public:
-    ClientIPC (CompileEngineChildProcess& cp)
+    explicit ClientIPC (CompileEngineChildProcess& cp)
        : InterprocessConnection (true), owner (cp)
     {
         launchServer();
@@ -705,7 +705,7 @@ private:
 
     struct TransactionTimer   : public Timer
     {
-        TransactionTimer (CodeDocument& doc) : document (doc) {}
+        explicit TransactionTimer (CodeDocument& doc) : document (doc) {}
 
         void timerCallback() override
         {
diff --git a/extras/Projucer/Source/LiveBuildEngine/jucer_CompileEngineServer.cpp b/extras/Projucer/Source/LiveBuildEngine/jucer_CompileEngineServer.cpp
index a9af29e990..f97f0e8736 100644
--- a/extras/Projucer/Source/LiveBuildEngine/jucer_CompileEngineServer.cpp
+++ b/extras/Projucer/Source/LiveBuildEngine/jucer_CompileEngineServer.cpp
@@ -54,7 +54,7 @@ struct ZombiePatrol    : private Thread,
                          private AsyncUpdater,
                          private Timer
 {
-    ZombiePatrol (MessageHandler& mh)
+    explicit ZombiePatrol (MessageHandler& mh)
        : Thread ("Ping"), owner (mh)
     {
         startThread (2);
@@ -135,7 +135,7 @@ class ServerIPC  : public InterprocessConnection,
                    public MessageHandler
 {
 public:
-    ServerIPC (const StringArray& info)
+    explicit ServerIPC (const StringArray& info)
        : InterprocessConnection (true), liveCodeBuilder (nullptr)
     {
         if (! createPipe (info[0], -1))
diff --git a/extras/Projucer/Source/Utility/UI/jucer_JucerTreeViewBase.cpp b/extras/Projucer/Source/Utility/UI/jucer_JucerTreeViewBase.cpp
index 94582e1872..f6b7489cf9 100644
--- a/extras/Projucer/Source/Utility/UI/jucer_JucerTreeViewBase.cpp
+++ b/extras/Projucer/Source/Utility/UI/jucer_JucerTreeViewBase.cpp
@@ -220,7 +220,7 @@ ProjectContentComponent* JucerTreeViewBase::getProjectContentComponent() const
 class JucerTreeViewBase::ItemSelectionTimer  : public Timer
 {
 public:
-    ItemSelectionTimer (JucerTreeViewBase& tvb)  : owner (tvb) {}
+    explicit ItemSelectionTimer (JucerTreeViewBase& tvb)  : owner (tvb) {}
 
     void timerCallback() override    { owner.invokeShowDocument(); }