diff --git a/3rdparty/README.md b/3rdparty/README.md
--- a/3rdparty/README.md
+++ b/3rdparty/README.md
@@ -118,6 +118,7 @@
     On OSX and Windows:
     ```
     cmake --build . --config RelWithDebInfo --target ext_gettext
+    cmake --build . --config RelWithDebInfo --target ext_openssl
     ```
 
     On all operating systems:
diff --git a/3rdparty/ext_openssl/CMakeLists.txt b/3rdparty/ext_openssl/CMakeLists.txt
--- a/3rdparty/ext_openssl/CMakeLists.txt
+++ b/3rdparty/ext_openssl/CMakeLists.txt
@@ -1,17 +1,59 @@
 SET(PREFIX_ext_openssl "${EXTPREFIX}" )
 
-ExternalProject_Add( ext_openssl
-    DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-    URL https://www.openssl.org/source/openssl-1.1.1b.tar.gz
-    URL_HASH SHA1=e9710abf5e95c48ebf47991b10cbb48c09dae102
+if (WIN32)
 
-    CONFIGURE_COMMAND <SOURCE_DIR>/config --prefix=${PREFIX_ext_openssl} --openssldir=ssl
+    # Use the binaries from curl for Windows (https://github.com/curl/curl-for-win).
+    # The original source URLs are:
+    # - https://curl.haxx.se/windows/dl-7.64.1/openssl-1.1.1b-win64-mingw.zip
+    # - https://curl.haxx.se/windows/dl-7.64.1/openssl-1.1.1b-win32-mingw.zip
+    if ("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
+        ExternalProject_Add(ext_openssl
+            DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
+            URL https://files.kde.org/krita/build/dependencies/openssl-1.1.1b-win64-mingw.zip
+            URL_MD5 2dd7041cdcdfb44ad395fd6d4db216a2
 
-    BUILD_COMMAND make depend COMMAND make
-    INSTALL_COMMAND make install
+            BUILD_COMMAND ${CMAKE_COMMAND} -E echo Deploying openssl 64-bit dependencies
+            CONFIGURE_COMMAND ""
+            INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory <SOURCE_DIR>/include ${PREFIX_ext_openssl}/include
+                    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/lib/libcrypto.dll.a ${PREFIX_ext_openssl}/lib
+                    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/lib/libssl.dll.a ${PREFIX_ext_openssl}/lib
+                    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/libcrypto-1_1-x64.dll ${PREFIX_ext_openssl}/bin
+                    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/libssl-1_1-x64.dll ${PREFIX_ext_openssl}/bin
+            UPDATE_COMMAND ""
+        )
+    else ("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
+        ExternalProject_Add(ext_openssl
+            DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
+            URL https://files.kde.org/krita/build/dependencies/openssl-1.1.1b-win32-mingw.zip
+            URL_MD5 24021021fb27c357f0728844cfce3927
 
-    INSTALL_DIR ${PREFIX_ext_openssl}
-    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_fftw3} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE}
+            BUILD_COMMAND ${CMAKE_COMMAND} -E echo Deploying openssl 32-bit dependencies
+            CONFIGURE_COMMAND ""
+            INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory <SOURCE_DIR>/include ${PREFIX_ext_openssl}/include
+                    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/lib/libcrypto.dll.a ${PREFIX_ext_openssl}/lib
+                    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/lib/libssl.dll.a ${PREFIX_ext_openssl}/lib
+                    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/libcrypto-1_1.dll ${PREFIX_ext_openssl}/bin
+                    COMMAND ${CMAKE_COMMAND} -E copy <SOURCE_DIR>/libssl-1_1.dll ${PREFIX_ext_openssl}/bin
+            UPDATE_COMMAND ""
+        )
+    endif ("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
 
-    UPDATE_COMMAND ""
-)
\ No newline at end of file
+else (WIN32)
+
+    ExternalProject_Add( ext_openssl
+        DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
+        URL https://www.openssl.org/source/openssl-1.1.1b.tar.gz
+        URL_HASH SHA1=e9710abf5e95c48ebf47991b10cbb48c09dae102
+
+        CONFIGURE_COMMAND <SOURCE_DIR>/config --prefix=${PREFIX_ext_openssl} --openssldir=ssl
+
+        BUILD_COMMAND make depend COMMAND make
+        INSTALL_COMMAND make install
+
+        INSTALL_DIR ${PREFIX_ext_openssl}
+        CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_fftw3} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE}
+
+        UPDATE_COMMAND ""
+    )
+
+endif (WIN32)
diff --git a/3rdparty/ext_qt/CMakeLists.txt b/3rdparty/ext_qt/CMakeLists.txt
--- a/3rdparty/ext_qt/CMakeLists.txt
+++ b/3rdparty/ext_qt/CMakeLists.txt
@@ -5,13 +5,15 @@
         -skip qtlocation -skip qtsensors -skip qtserialport -skip qtwayland
         -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview
         -skip qtxmlpatterns -no-sql-sqlite -nomake examples -nomake tools
-        -no-compile-examples -no-dbus -no-iconv -no-qml-debug -no-ssl
+        -no-compile-examples -no-dbus -no-iconv -no-qml-debug
         -no-libproxy -no-system-proxies -no-icu -no-mtdev
         -skip qtcharts -skip qtdatavis3d -skip qtgamepad -skip qtnetworkauth
         -skip qtpurchasing -skip qtremoteobjects -skip qtscxml -skip qtserialbus
         -skip qtspeech -skip qtvirtualkeyboard
         #
-        -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg
+        -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -openssl-linked
+        -I ${EXTPREFIX_qt}/include
+        -L ${EXTPREFIX_qt}/lib
         #
         -opensource -confirm-license
         #
@@ -66,7 +68,7 @@
       # Use a short name to reduce the chance of exceeding path length limit
       SOURCE_DIR s
       BINARY_DIR b
-      DEPENDS ext_patch
+      DEPENDS ext_patch ext_openssl
   )
 elseif (NOT APPLE)
   ExternalProject_Add(
diff --git a/build-tools/windows/build.cmd b/build-tools/windows/build.cmd
--- a/build-tools/windows/build.cmd
+++ b/build-tools/windows/build.cmd
@@ -707,8 +707,8 @@
 )
 echo.
 
-set EXT_TARGETS=patch png2ico zlib lzma gettext qt boost eigen3 exiv2 fftw3 ilmbase
-set EXT_TARGETS=%EXT_TARGETS% jpeg lcms2 ocio openexr png tiff gsl vc libraw
+set EXT_TARGETS=patch png2ico zlib lzma gettext openssl qt boost eigen3 exiv2 fftw3
+set EXT_TARGETS=%EXT_TARGETS% ilmbase jpeg lcms2 ocio openexr png tiff gsl vc libraw
 set EXT_TARGETS=%EXT_TARGETS% giflib freetype poppler kwindowsystem drmingw gmic
 set EXT_TARGETS=%EXT_TARGETS% python sip pyqt
 set EXT_TARGETS=%EXT_TARGETS% quazip