diff --git a/CMakeLists.txt b/CMakeLists.txt
index bbe5516c0..991eabaf5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,6 +33,7 @@ option(NO_USERMANUAL "don't include a viewer for the user manual" OFF)
 option(FBSUPPORT "allow posting to Facebook" ON)
 option(BTSUPPORT "enable support for QtBluetooth (requires Qt5.4 or newer)" ON)
 option(FTDISUPPORT "enable support for libftdi based serial" OFF)
+option(USE_WEBENGINE "Use QWebEngine instead of QWebKit" OFF)
 
 # Options regarding What should we build on subsurface
 option(MAKE_TESTS "Make the tests" ON)
diff --git a/cmake/Modules/HandleUserManual.cmake b/cmake/Modules/HandleUserManual.cmake
index 6e4874c60..a9354be2b 100644
--- a/cmake/Modules/HandleUserManual.cmake
+++ b/cmake/Modules/HandleUserManual.cmake
@@ -2,6 +2,13 @@ if(NO_USERMANUAL)
 	message(STATUS "building without usermanual")
 	add_definitions(-DNO_USERMANUAL)
 else()
-	list(APPEND QT_EXTRA_COMPONENTS WebKitWidgets)
-	list(APPEND QT_EXTRA_LIBRARIES Qt5::WebKitWidgets)
+	if(USE_WEBENGINE)
+		message(STATUS "building with QWebEngine")
+		list(APPEND QT_EXTRA_COMPONENTS WebEngineWidgets)
+		list(APPEND QT_EXTRA_LIBRARIES Qt5::WebEngineWidgets)
+		add_definitions(-DUSE_WEBENGINE)
+	else()
+		list(APPEND QT_EXTRA_COMPONENTS WebKitWidgets)
+		list(APPEND QT_EXTRA_LIBRARIES Qt5::WebKitWidgets)
+	endif()
 endif()
diff --git a/core/imagedownloader.cpp b/core/imagedownloader.cpp
index d4dd85922..16c48a00e 100644
--- a/core/imagedownloader.cpp
+++ b/core/imagedownloader.cpp
@@ -100,6 +100,8 @@ SHashedImage::SHashedImage(struct picture *picture) : QImage()
 		// This did not load anything. Let's try to get the image from other sources
 		// Let's try to load it locally via its hash
 		QString filename = fileFromHash(picture->hash);
+		if (filename.isNull())
+			filename = QString(picture->filename);
 		if (filename.isNull()) {
 			// That didn't produce a local filename.
 			// Try the cloud server
diff --git a/core/qthelper.cpp b/core/qthelper.cpp
index 885e89d98..088067f26 100644
--- a/core/qthelper.cpp
+++ b/core/qthelper.cpp
@@ -1075,6 +1075,8 @@ QByteArray hashFile(const QString filename)
 
 void learnHash(struct picture *picture, QByteArray hash)
 {
+	if (hash.isNull())
+		return;
 	if (picture->hash)
 		free(picture->hash);
 	QMutexLocker locker(&hashOfMutex);
@@ -1100,6 +1102,8 @@ QString localFilePath(const QString originalFilename)
 
 QString fileFromHash(char *hash)
 {
+	if (!hash || !*hash)
+		return "";
 	QMutexLocker locker(&hashOfMutex);
 
 	return localFilenameOf[QByteArray::fromHex(hash)];
@@ -1120,7 +1124,7 @@ void hashPicture(struct picture *picture)
 	if (!picture)
 		return;
 	char *oldHash = copy_string(picture->hash);
-	learnHash(picture, hashFile(QString(picture->filename)));
+	learnHash(picture, hashFile(localFilePath(picture->filename)));
 	if (!same_string(picture->hash, "") && !same_string(picture->hash, oldHash))
 		mark_divelist_changed((true));
 	free(oldHash);
diff --git a/desktop-widgets/plugins/facebook/facebookconnectwidget.cpp b/desktop-widgets/plugins/facebook/facebookconnectwidget.cpp
index e0d2aab67..40d598229 100644
--- a/desktop-widgets/plugins/facebook/facebookconnectwidget.cpp
+++ b/desktop-widgets/plugins/facebook/facebookconnectwidget.cpp
@@ -16,8 +16,11 @@
 #include <QDebug>
 #include <QMessageBox>
 #include <QInputDialog>
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#else
 #include <QWebView>
-
+#endif
 #include "mainwindow.h"
 #include "profile-widget/profilewidget2.h"
 
@@ -224,14 +227,22 @@ void FacebookManager::sendDive()
 FacebookConnectWidget::FacebookConnectWidget(QWidget *parent) : QDialog(parent), ui(new Ui::FacebookConnectWidget) {
 	ui->setupUi(this);
 	FacebookManager *fb = FacebookManager::instance();
+#ifdef USE_WEBENGINE
+	facebookWebView = new QWebEngineView(this);
+#else
 	facebookWebView = new QWebView(this);
+#endif
 	ui->fbWebviewContainer->layout()->addWidget(facebookWebView);
 	if (fb->loggedIn()) {
 		facebookLoggedIn();
 	} else {
 		facebookDisconnect();
 	}
+#ifdef USE_WEBENGINE
+	connect(facebookWebView, &QWebEngineView::urlChanged, fb, &FacebookManager::tryLogin);
+#else
 	connect(facebookWebView, &QWebView::urlChanged, fb, &FacebookManager::tryLogin);
+#endif
 	connect(fb, &FacebookManager::justLoggedIn, this, &FacebookConnectWidget::facebookLoggedIn);
 }
 
@@ -250,7 +261,11 @@ void FacebookConnectWidget::facebookDisconnect()
 	ui->fbWebviewContainer->setEnabled(true);
 	ui->FBLabel->setText(tr("To connect to Facebook, please log in. This enables Subsurface to publish dives to your timeline"));
 	if (facebookWebView) {
+#ifdef USE_WEBENGINE
+	//FIX ME
+#else
 		facebookWebView->page()->networkAccessManager()->setCookieJar(new QNetworkCookieJar());
+#endif
 		facebookWebView->setUrl(FacebookManager::instance()->connectUrl());
 	}
 }
diff --git a/desktop-widgets/plugins/facebook/facebookconnectwidget.h b/desktop-widgets/plugins/facebook/facebookconnectwidget.h
index e97097806..8fbf249e2 100644
--- a/desktop-widgets/plugins/facebook/facebookconnectwidget.h
+++ b/desktop-widgets/plugins/facebook/facebookconnectwidget.h
@@ -2,7 +2,11 @@
 #define FACEBOOKCONNECTWIDGET_H
 
 #include <QDialog>
+#ifdef USE_WEBENGINE
+class QWebEngineView;
+#else
 class QWebView;
+#endif
 namespace Ui {
   class FacebookConnectWidget;
   class SocialnetworksDialog;
@@ -41,7 +45,11 @@ public:
 	void facebookDisconnect();
 private:
 	Ui::FacebookConnectWidget *ui;
+#ifdef USE_WEBENGINE
+	QWebEngineView *facebookWebView;
+#else
 	QWebView *facebookWebView;
+#endif
 };
 
 class SocialNetworkDialog : public QDialog {
diff --git a/desktop-widgets/printer.cpp b/desktop-widgets/printer.cpp
index eea304347..bad1c2760 100644
--- a/desktop-widgets/printer.cpp
+++ b/desktop-widgets/printer.cpp
@@ -4,10 +4,14 @@
 #include "core/helpers.h"
 
 #include <algorithm>
-#include <QtWebKitWidgets>
 #include <QPainter>
+#ifdef USE_WEBENGINE
+#include <QtWebEngineWidgets>
+#else
+#include <QtWebKitWidgets>
 #include <QWebElementCollection>
 #include <QWebElement>
+#endif
 #include "profile-widget/profilewidget2.h"
 
 Printer::Printer(QPaintDevice *paintDevice, print_options *printOptions, template_options *templateOptions,  PrintMode printMode)
@@ -18,7 +22,11 @@ Printer::Printer(QPaintDevice *paintDevice, print_options *printOptions, templat
 	this->printMode = printMode;
 	dpi = 0;
 	done = 0;
+#ifdef USE_WEBENGINE
+	webView = new QWebEngineView();
+#else
 	webView = new QWebView();
+#endif
 }
 
 Printer::~Printer()
@@ -61,6 +69,7 @@ void Printer::putProfileImage(QRect profilePlaceholder, QRect viewPort, QPainter
 void Printer::flowRender()
 {
 	// add extra padding at the bottom to pages with height not divisible by view port
+#ifndef USE_WEBENGINE
 	int paddingBottom = pageSize.height() - (webView->page()->mainFrame()->contentsSize().height() % pageSize.height());
 	QString styleString = QString::fromUtf8("padding-bottom: ") + QString::number(paddingBottom) + "px;";
 	webView->page()->mainFrame()->findFirstElement("body").setAttribute("style", styleString);
@@ -115,6 +124,9 @@ void Printer::flowRender()
 	webView->page()->mainFrame()->render(&painter, QWebFrame::ContentsLayer, reigon);
 
 	painter.end();
+#else
+	// FIX ME
+#endif
 }
 
 void Printer::render(int Pages = 0)
@@ -140,6 +152,9 @@ void Printer::render(int Pages = 0)
 	painter.setRenderHint(QPainter::SmoothPixmapTransform);
 
 	// get all refereces to diveprofile class in the Html template
+#ifdef USE_WEBENGINE
+	//FIX ME
+#else
 	QWebElementCollection collection = webView->page()->mainFrame()->findAllElements(".diveprofile");
 
 	QSize originalSize = profile->size();
@@ -173,13 +188,18 @@ void Printer::render(int Pages = 0)
 			static_cast<QPrinter*>(paintDevice)->newPage();
 	}
 	painter.end();
+#endif
 
 	// return profle settings
 	profile->setFrameStyle(profileFrameStyle);
 	profile->setPrintMode(false);
 	profile->setFontPrintScale(fontScale);
 	profile->setToolTipVisibile(true);
+#ifdef USE_WEBENGINE
+	//FIXME
+#else
 	profile->resize(originalSize);
+#endif
 	prefs.animation_speed = animationOriginal;
 
 	//replot the dive after returning the settings
@@ -210,8 +230,12 @@ void Printer::print()
 	//rendering resolution = selected paper size in inchs * printer dpi
 	pageSize.setHeight(qCeil(printerPtr->pageRect(QPrinter::Inch).height() * dpi));
 	pageSize.setWidth(qCeil(printerPtr->pageRect(QPrinter::Inch).width() * dpi));
+#ifdef USE_WEBENGINE
+	//FIXME
+#else
 	webView->page()->setViewportSize(pageSize);
 	webView->page()->mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
+#endif
 	// export border width with at least 1 pixel
 	templateOptions->border_width = std::max(1, pageSize.width() / 1000);
 	if (printOptions->type == print_options::DIVELIST) {
@@ -229,11 +253,15 @@ void Printer::print()
 
 	// get number of dives per page from data-numberofdives attribute in the body of the selected template
 	bool ok;
+#ifdef USE_WEBENGINE
+	// FIX ME
+#else
 	divesPerPage = webView->page()->mainFrame()->findFirstElement("body").attribute("data-numberofdives").toInt(&ok);
 	if (!ok) {
 		divesPerPage = 1; // print each dive in a single page if the attribute is missing or malformed
 		//TODO: show warning
 	}
+#endif
 	int Pages;
 	if (divesPerPage == 0) {
 		flowRender();
@@ -250,7 +278,11 @@ void Printer::previewOnePage()
 
 		pageSize.setHeight(paintDevice->height());
 		pageSize.setWidth(paintDevice->width());
+#ifdef USE_WEBENGINE
+		//FIXME
+#else
 		webView->page()->setViewportSize(pageSize);
+#endif
 		// initialize the border settings
 		templateOptions->border_width = std::max(1, pageSize.width() / 1000);
 		if (printOptions->type == print_options::DIVELIST) {
@@ -258,7 +290,10 @@ void Printer::previewOnePage()
 		} else if (printOptions->type == print_options::STATISTICS ) {
 			webView->setHtml(t.generateStatistics());
 		}
-
+#ifdef USE_WEBENGINE
+		// FIX ME
+		render(1);
+#else
 		bool ok;
 		int divesPerPage = webView->page()->mainFrame()->findFirstElement("body").attribute("data-numberofdives").toInt(&ok);
 		if (!ok) {
@@ -270,5 +305,6 @@ void Printer::previewOnePage()
 		} else {
 			render(1);
 		}
+#endif
 	}
 }
diff --git a/desktop-widgets/printer.h b/desktop-widgets/printer.h
index e5f16d77d..fc867bb3c 100644
--- a/desktop-widgets/printer.h
+++ b/desktop-widgets/printer.h
@@ -2,7 +2,11 @@
 #define PRINTER_H
 
 #include <QPrinter>
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#else
 #include <QWebView>
+#endif
 #include <QRect>
 #include <QPainter>
 
@@ -20,7 +24,11 @@ public:
 
 private:
 	QPaintDevice *paintDevice;
+#ifdef USE_WEBENGINE
+	QWebEngineView *webView;
+#else
 	QWebView *webView;
+#endif
 	print_options *printOptions;
 	template_options *templateOptions;
 	QSize pageSize;
diff --git a/desktop-widgets/usermanual.cpp b/desktop-widgets/usermanual.cpp
index 690307961..8e75b432f 100644
--- a/desktop-widgets/usermanual.cpp
+++ b/desktop-widgets/usermanual.cpp
@@ -34,6 +34,27 @@ void SearchBar::enableButtons(const QString &s)
 	ui.findNext->setEnabled(s.length());
 }
 
+#ifdef USE_WEBENGINE
+MyQWebEnginePage::MyQWebEnginePage(QObject* parent) : QWebEnginePage(parent)
+{
+}
+
+bool MyQWebEnginePage::acceptNavigationRequest(const QUrl & url, QWebEnginePage::NavigationType type, bool)
+{
+	if (type == QWebEnginePage::NavigationTypeLinkClicked)
+	{
+		QDesktopServices::openUrl(url);
+		return false;
+	}
+	return true;
+}
+
+
+MyQWebEngineView::MyQWebEngineView(QWidget* parent)
+{
+}
+#endif
+
 UserManual::UserManual(QWidget *parent) : QWidget(parent)
 {
 	QShortcut *closeKey = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), this);
@@ -54,12 +75,20 @@ UserManual::UserManual(QWidget *parent) : QWidget(parent)
 	setWindowTitle(tr("User manual"));
 	setWindowIcon(QIcon(":/subsurface-icon"));
 
+#ifdef USE_WEBENGINE
+	userManual = new MyQWebEngineView(this);
+	MyQWebEnginePage *page = new MyQWebEnginePage();
+	userManual->setPage(page);
+#else
 	userManual = new QWebView(this);
+#endif
 	QString colorBack = palette().highlight().color().name(QColor::HexRgb);
 	QString colorText = palette().highlightedText().color().name(QColor::HexRgb);
 	userManual->setStyleSheet(QString("QWebView { selection-background-color: %1; selection-color: %2; }")
 		.arg(colorBack).arg(colorText));
+#ifndef USE_WEBENGINE
 	userManual->page()->setLinkDelegationPolicy(QWebPage::DelegateExternalLinks);
+#endif
 	QString searchPath = getSubsurfaceDataPath("Documentation");
 	if (searchPath.size()) {
 		// look for localized versions of the manual first
@@ -84,7 +113,9 @@ UserManual::UserManual(QWidget *parent) : QWidget(parent)
 	searchBar->hide();
 	connect(actionShowSearch, SIGNAL(triggered(bool)), searchBar, SLOT(show()));
 	connect(actionHideSearch, SIGNAL(triggered(bool)), searchBar, SLOT(hide()));
+#ifndef USE_WEBENGINE
 	connect(userManual, SIGNAL(linkClicked(QUrl)), this, SLOT(linkClickedSlot(QUrl)));
+#endif
 	connect(searchBar, SIGNAL(searchTextChanged(QString)), this, SLOT(searchTextChanged(QString)));
 	connect(searchBar, SIGNAL(searchNext()), this, SLOT(searchNext()));
 	connect(searchBar, SIGNAL(searchPrev()), this, SLOT(searchPrev()));
@@ -96,6 +127,13 @@ UserManual::UserManual(QWidget *parent) : QWidget(parent)
 	setLayout(vboxLayout);
 }
 
+#ifdef USE_WEBENGINE
+void UserManual::search(QString text, QWebEnginePage::FindFlags flags = 0)
+{
+	userManual->findText(text, flags,
+			     [this, text](bool found) {searchBar->setStyleSheet(found || text.length() == 0 ? "" : "QLineEdit{background: red;}");});
+}
+#else
 void UserManual::search(QString text, QWebPage::FindFlags flags = 0)
 {
 	if (userManual->findText(text, QWebPage::FindWrapsAroundDocument | flags) || text.length() == 0) {
@@ -104,6 +142,7 @@ void UserManual::search(QString text, QWebPage::FindFlags flags = 0)
 		searchBar->setStyleSheet("QLineEdit{background: red;}");
 	}
 }
+#endif
 
 void UserManual::searchTextChanged(const QString& text)
 {
@@ -118,13 +157,19 @@ void UserManual::searchNext()
 
 void UserManual::searchPrev()
 {
+#ifdef USE_WEBENGINE
+	search(mLastText, QWebEnginePage::FindBackward);
+#else
 	search(mLastText, QWebPage::FindBackward);
+#endif
 }
 
+#ifndef USE_WEBENGINE
 void UserManual::linkClickedSlot(const QUrl& url)
 {
 	QDesktopServices::openUrl(url);
 }
+#endif
 
 #ifdef Q_OS_MAC
 void UserManual::showEvent(QShowEvent *e) {
diff --git a/desktop-widgets/usermanual.h b/desktop-widgets/usermanual.h
index 5101a3c3b..04ae15605 100644
--- a/desktop-widgets/usermanual.h
+++ b/desktop-widgets/usermanual.h
@@ -1,8 +1,12 @@
 #ifndef USERMANUAL_H
 #define USERMANUAL_H
 
+#ifdef USE_WEBENGINE
+#include <QWebEngineView>
+#include <QWebEnginePage>
+#else
 #include <QWebView>
-
+#endif
 #include "ui_searchbar.h"
 
 class SearchBar : public QWidget{
@@ -21,6 +25,27 @@ private:
 	Ui::SearchBar ui;
 };
 
+#ifdef USE_WEBENGINE
+class MyQWebEnginePage : public QWebEnginePage
+{
+	Q_OBJECT
+
+public:
+	MyQWebEnginePage(QObject* parent = 0);
+	bool acceptNavigationRequest(const QUrl & url, QWebEnginePage::NavigationType type, bool);
+};
+
+class MyQWebEngineView : public QWebEngineView
+{
+	Q_OBJECT
+
+public:
+	MyQWebEngineView(QWidget* parent = 0);
+	MyQWebEnginePage* page() const;
+};
+#endif
+
+
 class UserManual : public QWidget {
 	Q_OBJECT
 
@@ -40,11 +65,18 @@ slots:
 	void searchTextChanged(const QString& s);
 	void searchNext();
 	void searchPrev();
+#ifndef USE_WEBENGINE
 	void linkClickedSlot(const QUrl& url);
+#endif
 private:
-	QWebView *userManual;
 	SearchBar *searchBar;
 	QString mLastText;
+#ifdef USE_WEBENGINE
+	QWebEngineView *userManual;
+	void search(QString, QWebEnginePage::FindFlags);
+#else
+	QWebView *userManual;
 	void search(QString, QWebPage::FindFlags);
+#endif
 };
 #endif // USERMANUAL_H