diff --git a/src/plugins/clangformat/clangformatconfigwidget.cpp b/src/plugins/clangformat/clangformatconfigwidget.cpp
index 9d44fe1dcc8..2a6f3f9b6b5 100644
--- a/src/plugins/clangformat/clangformatconfigwidget.cpp
+++ b/src/plugins/clangformat/clangformatconfigwidget.cpp
@@ -43,7 +43,9 @@
 #include <extensionsystem/pluginspec.h>
 #include <projectexplorer/project.h>
 #include <projectexplorer/session.h>
+#include <projectexplorer/editorconfiguration.h>
 #include <texteditor/displaysettings.h>
+#include <texteditor/icodestylepreferences.h>
 #include <texteditor/snippets/snippeteditor.h>
 #include <texteditor/textdocument.h>
 #include <texteditor/texteditorsettings.h>
@@ -100,19 +102,22 @@ bool ClangFormatConfigWidget::eventFilter(QObject *object, QEvent *event)
     return QWidget::eventFilter(object, event);
 }
 
-ClangFormatConfigWidget::ClangFormatConfigWidget(ProjectExplorer::Project *project, QWidget *parent)
+ClangFormatConfigWidget::ClangFormatConfigWidget(TextEditor::ICodeStylePreferences *codeStyle,
+                                                 ProjectExplorer::Project *project,
+                                                 QWidget *parent)
     : CppCodeStyleWidget(parent)
     , m_project(project)
     , m_checks(std::make_unique<Ui::ClangFormatChecksWidget>())
     , m_ui(std::make_unique<Ui::ClangFormatConfigWidget>())
 {
     m_ui->setupUi(this);
+    setEnabled(!codeStyle->isReadOnly());
 
     Utils::FilePath filePath = Core::ICore::userResourcePath();
-    if (m_project)
-        filePath = filePath / "clang-format/" / currentProjectUniqueId();
-    filePath = filePath / QLatin1String(Constants::SETTINGS_FILE_NAME);
-    m_config = std::make_unique<ClangFormatFile>(filePath);
+    filePath = filePath / "clang-format/"
+               / Utils::FileUtils::fileSystemFriendlyName(codeStyle->displayName())
+               / QLatin1String(Constants::SETTINGS_FILE_NAME);
+    m_config = std::make_unique<ClangFormatFile>(filePath, codeStyle->isReadOnly());
 
     initChecksAndPreview();
     showCombobox();
@@ -329,8 +334,7 @@ void ClangFormatConfigWidget::fillTable()
     Utils::ExecuteOnDestruction executeOnDestruction([this]() { m_disableTableUpdate = false; });
     m_disableTableUpdate = true;
 
-    const std::string configText = m_project ? currentProjectConfigText()
-                                             : currentGlobalConfigText();
+    const std::string configText = readFile(m_config->filePath().path());
 
     for (QObject *child : m_checksWidget->children()) {
         if (!qobject_cast<QComboBox *>(child) && !qobject_cast<QLineEdit *>(child)
diff --git a/src/plugins/clangformat/clangformatconfigwidget.h b/src/plugins/clangformat/clangformatconfigwidget.h
index fb6ffa04e0b..9a460892501 100644
--- a/src/plugins/clangformat/clangformatconfigwidget.h
+++ b/src/plugins/clangformat/clangformatconfigwidget.h
@@ -48,7 +48,8 @@ class ClangFormatConfigWidget : public CppEditor::CppCodeStyleWidget
     Q_OBJECT
 
 public:
-    explicit ClangFormatConfigWidget(ProjectExplorer::Project *project = nullptr,
+    explicit ClangFormatConfigWidget(TextEditor::ICodeStylePreferences *codeStyle,
+                                     ProjectExplorer::Project *project = nullptr,
                                      QWidget *parent = nullptr);
     ~ClangFormatConfigWidget() override;
     void apply() override;
diff --git a/src/plugins/clangformat/clangformatfile.cpp b/src/plugins/clangformat/clangformatfile.cpp
index 3c64ebe1b48..b439dc5698b 100644
--- a/src/plugins/clangformat/clangformatfile.cpp
+++ b/src/plugins/clangformat/clangformatfile.cpp
@@ -25,6 +25,7 @@
 
 #include "clangformatfile.h"
 #include "clangformatsettings.h"
+#include "clangformatutils.h"
 #include <cppeditor/cppcodestylesettings.h>
 #include <projectexplorer/project.h>
 #include <texteditor/tabsettings.h>
@@ -34,11 +35,18 @@
 
 using namespace ClangFormat;
 
-ClangFormatFile::ClangFormatFile(Utils::FilePath filePath)
+ClangFormatFile::ClangFormatFile(Utils::FilePath filePath, bool isReadOnly)
     : m_filePath(filePath)
+    , m_isReadOnly(isReadOnly)
 {
     if (!m_filePath.exists()) {
-        resetStyleToLLVM();
+        // create file and folder
+        m_filePath.parentDir().createDir();
+        std::fstream newStyleFile(m_filePath.path().toStdString(), std::fstream::out);
+        if (newStyleFile.is_open()) {
+            newStyleFile.close();
+        }
+        resetStyleToQtC();
         return;
     }
 
@@ -46,7 +54,7 @@ ClangFormatFile::ClangFormatFile(Utils::FilePath filePath)
     const std::error_code error
         = clang::format::parseConfiguration(m_filePath.fileContents().toStdString(), &m_style);
     if (error.value() != static_cast<int>(clang::format::ParseError::Success)) {
-        resetStyleToLLVM();
+        resetStyleToQtC();
     }
 }
 
@@ -65,10 +73,15 @@ void ClangFormatFile::setStyle(clang::format::FormatStyle style)
     saveNewFormat();
 }
 
-void ClangFormatFile::resetStyleToLLVM()
+bool ClangFormatFile::isReadOnly() const
 {
-    m_style = clang::format::getLLVMStyle();
-    saveNewFormat();
+    return m_isReadOnly;
+}
+
+void ClangFormatFile::resetStyleToQtC()
+{
+    m_style = qtcStyle();
+    saveStyleToFile(m_style, m_filePath);
 }
 
 void ClangFormatFile::setBasedOnStyle(QString styleName)
@@ -107,17 +120,17 @@ QString ClangFormatFile::changeFields(QList<Field> fields)
 
 void ClangFormatFile::saveNewFormat()
 {
-    std::string style = clang::format::configurationAsText(m_style);
+    if (m_isReadOnly)
+        return;
 
-    // workaround: configurationAsText() add comment "# " before BasedOnStyle line
-    const int pos = style.find("# BasedOnStyle");
-    if (pos != int(std::string::npos))
-        style.erase(pos, 2);
-    m_filePath.writeFileContents(QByteArray::fromStdString(style));
+    saveStyleToFile(m_style, m_filePath);
 }
 
 void ClangFormatFile::saveNewFormat(QByteArray style)
 {
+    if (m_isReadOnly)
+        return;
+
     m_filePath.writeFileContents(style);
 }
 
diff --git a/src/plugins/clangformat/clangformatfile.h b/src/plugins/clangformat/clangformatfile.h
index f0dddd4ec03..da864c2a753 100644
--- a/src/plugins/clangformat/clangformatfile.h
+++ b/src/plugins/clangformat/clangformatfile.h
@@ -37,11 +37,11 @@ namespace ClangFormat {
 class ClangFormatFile
 {
 public:
-    explicit ClangFormatFile(Utils::FilePath file);
+    explicit ClangFormatFile(Utils::FilePath file, bool isReadOnly);
     clang::format::FormatStyle format();
 
     Utils::FilePath filePath();
-    void resetStyleToLLVM();
+    void resetStyleToQtC();
     void setBasedOnStyle(QString styleName);
     void setStyle(clang::format::FormatStyle style);
     QString setStyle(QString style);
@@ -54,6 +54,7 @@ public:
     TextEditor::TabSettings toTabSettings(ProjectExplorer::Project *project) const;
     void fromCppCodeStyleSettings(const CppEditor::CppCodeStyleSettings &settings);
     void fromTabSettings(const TextEditor::TabSettings &settings);
+    bool isReadOnly() const;
 
 private:
     void saveNewFormat();
@@ -62,6 +63,7 @@ private:
 private:
     Utils::FilePath m_filePath;
     clang::format::FormatStyle m_style;
+    const bool m_isReadOnly;
 };
 
 } // namespace ClangFormat
diff --git a/src/plugins/clangformat/clangformatplugin.cpp b/src/plugins/clangformat/clangformatplugin.cpp
index 0fbc44eefe9..78204ae3696 100644
--- a/src/plugins/clangformat/clangformatplugin.cpp
+++ b/src/plugins/clangformat/clangformatplugin.cpp
@@ -84,11 +84,13 @@ public:
         return new ClangFormatIndenter(doc);
     }
 
-    std::pair<CppEditor::CppCodeStyleWidget *, QString> additionalTab(QWidget *parent) const override
+    std::pair<CppEditor::CppCodeStyleWidget *, QString> additionalTab(
+        TextEditor::ICodeStylePreferences *codeStyle, QWidget *parent) const override
     {
         if (!parent)
-            return {new ClangFormatConfigWidget(),  tr("ClangFormat")};
-        return {new ClangFormatConfigWidget(SessionManager::startupProject()), tr("ClangFormat")};
+            return {new ClangFormatConfigWidget(codeStyle), tr("ClangFormat")};
+        return {new ClangFormatConfigWidget(codeStyle, SessionManager::startupProject()),
+                tr("ClangFormat")};
     }
 };
 
diff --git a/src/plugins/clangformat/clangformatutils.cpp b/src/plugins/clangformat/clangformatutils.cpp
index cf32bff3545..21fab5cc931 100644
--- a/src/plugins/clangformat/clangformatutils.cpp
+++ b/src/plugins/clangformat/clangformatutils.cpp
@@ -200,6 +200,17 @@ QString currentProjectUniqueId()
                                  .toHex(0));
 }
 
+void saveStyleToFile(clang::format::FormatStyle style, Utils::FilePath filePath)
+{
+    std::string styleStr = clang::format::configurationAsText(style);
+
+    // workaround: configurationAsText() add comment "# " before BasedOnStyle line
+    const int pos = styleStr.find("# BasedOnStyle");
+    if (pos != int(std::string::npos))
+        styleStr.erase(pos, 2);
+    filePath.writeFileContents(QByteArray::fromStdString(styleStr));
+}
+
 static bool useProjectOverriddenSettings()
 {
     const Project *project = SessionManager::startupProject();
@@ -371,7 +382,7 @@ void addQtcStatementMacros(clang::format::FormatStyle &style)
     }
 }
 
-static std::string readFile(const QString &path)
+std::string readFile(const QString &path)
 {
     const std::string defaultStyle = clang::format::configurationAsText(qtcStyle());
 
diff --git a/src/plugins/clangformat/clangformatutils.h b/src/plugins/clangformat/clangformatutils.h
index 3caf6c9d6fc..aa7a8f30cc1 100644
--- a/src/plugins/clangformat/clangformatutils.h
+++ b/src/plugins/clangformat/clangformatutils.h
@@ -46,10 +46,12 @@ std::string currentGlobalConfigText();
 
 clang::format::FormatStyle currentProjectStyle();
 clang::format::FormatStyle currentGlobalStyle();
+std::string readFile(const QString &path);
 
 // Is the style from the matching .clang-format file or global one if it's not found.
 QString configForFile(Utils::FilePath fileName);
 clang::format::FormatStyle styleForFile(Utils::FilePath fileName);
+void saveStyleToFile(clang::format::FormatStyle style, Utils::FilePath filePath);
 
 void addQtcStatementMacros(clang::format::FormatStyle &style);
 clang::format::FormatStyle qtcStyle();
diff --git a/src/plugins/cppeditor/cppcodestylepreferencesfactory.cpp b/src/plugins/cppeditor/cppcodestylepreferencesfactory.cpp
index c417f945c22..c3ec1b345eb 100644
--- a/src/plugins/cppeditor/cppcodestylepreferencesfactory.cpp
+++ b/src/plugins/cppeditor/cppcodestylepreferencesfactory.cpp
@@ -109,7 +109,7 @@ TextEditor::CodeStyleEditorWidget *CppCodeStylePreferencesFactory::createEditor(
     widget->layout()->setContentsMargins(0, 0, 0, 0);
     widget->setCodeStyle(cppPreferences);
 
-    const auto tab = additionalTab(parent);
+    const auto tab = additionalTab(preferences, parent);
     widget->addTab(tab.first, tab.second);
 
     return widget;
@@ -131,8 +131,9 @@ QString CppCodeStylePreferencesFactory::previewText() const
 }
 
 std::pair<CppCodeStyleWidget *, QString> CppCodeStylePreferencesFactory::additionalTab(
-    QWidget *parent) const
+    TextEditor::ICodeStylePreferences *codeStyle, QWidget *parent) const
 {
+    Q_UNUSED(codeStyle)
     Q_UNUSED(parent)
     return {nullptr, ""};
 }
diff --git a/src/plugins/cppeditor/cppcodestylepreferencesfactory.h b/src/plugins/cppeditor/cppcodestylepreferencesfactory.h
index 60c123a64ec..8c5848bb87a 100644
--- a/src/plugins/cppeditor/cppcodestylepreferencesfactory.h
+++ b/src/plugins/cppeditor/cppcodestylepreferencesfactory.h
@@ -45,7 +45,8 @@ public:
     TextEditor::Indenter *createIndenter(QTextDocument *doc) const override;
     QString snippetProviderGroupId() const override;
     QString previewText() const override;
-    virtual std::pair<CppCodeStyleWidget *, QString> additionalTab(QWidget *parent) const;
+    virtual std::pair<CppCodeStyleWidget *, QString> additionalTab(
+        TextEditor::ICodeStylePreferences *codeStyle, QWidget *parent) const;
 };
 
 } // namespace CppEditor
diff --git a/src/plugins/texteditor/codestyleselectorwidget.cpp b/src/plugins/texteditor/codestyleselectorwidget.cpp
index 11cd927a34b..ca1616cb1cc 100644
--- a/src/plugins/texteditor/codestyleselectorwidget.cpp
+++ b/src/plugins/texteditor/codestyleselectorwidget.cpp
@@ -104,6 +104,7 @@ CodeStyleDialog::CodeStyleDialog(ICodeStylePreferencesFactory *factory,
     m_codeStyle->setValue(codeStyle->value());
     m_codeStyle->setId(codeStyle->id());
     m_codeStyle->setDisplayName(m_originalDisplayName);
+    m_codeStyle->setReadOnly(codeStyle->isReadOnly());
     TextEditor::CodeStyleEditorWidget *editor = factory->createEditor(m_codeStyle, this);
 
     m_buttons = new QDialogButtonBox(