diff --git a/src/plugins/clangformat/clangformatconstants.h b/src/plugins/clangformat/clangformatconstants.h
index 5bd8b1246c3..572effee21e 100644
--- a/src/plugins/clangformat/clangformatconstants.h
+++ b/src/plugins/clangformat/clangformatconstants.h
@@ -13,6 +13,7 @@ static const char OVERRIDE_FILE_ID[] = "ClangFormat.OverrideFile";
 static const char FORMAT_CODE_ON_SAVE_ID[] = "ClangFormat.FormatCodeOnSave";
 static const char FORMAT_WHILE_TYPING_ID[] = "ClangFormat.FormatWhileTyping";
 static const char MODE_ID[] = "ClangFormat.Mode";
+static const char FILE_SIZE_THREDSHOLD[] = "ClangFormat.FileSizeThreshold";
 static const char USE_GLOBAL_SETTINGS[] = "ClangFormat.UseGlobalSettings";
 static const char OPEN_CURRENT_CONFIG_ID[] = "ClangFormat.OpenCurrentConfig";
 } // namespace Constants
diff --git a/src/plugins/clangformat/clangformatglobalconfigwidget.cpp b/src/plugins/clangformat/clangformatglobalconfigwidget.cpp
index af8a0846b15..d8533f268c7 100644
--- a/src/plugins/clangformat/clangformatglobalconfigwidget.cpp
+++ b/src/plugins/clangformat/clangformatglobalconfigwidget.cpp
@@ -16,6 +16,7 @@
 #include <QCheckBox>
 #include <QComboBox>
 #include <QLabel>
+#include <QSpinBox>
 #include <QWidget>
 
 #include <sstream>
@@ -31,8 +32,14 @@ ClangFormatGlobalConfigWidget::ClangFormatGlobalConfigWidget(
     , m_project(project)
     , m_codeStyle(codeStyle)
 {
+    const QString sizeThresholdToolTip = Tr::tr(
+        "Files greater than this will not be indented by ClangFormat.\n"
+        "The built-in code indenter will handle indentation.");
+
     m_projectHasClangFormat = new QLabel(this);
     m_formattingModeLabel = new QLabel(Tr::tr("Formatting mode:"));
+    m_fileSizeThresholdLabel = new QLabel(Tr::tr("Ignore files greater than:"));
+    m_fileSizeThresholdSpinBox = new QSpinBox(this);
     m_indentingOrFormatting = new QComboBox(this);
     m_formatWhileTyping = new QCheckBox(Tr::tr("Format while typing"));
     m_formatOnSave = new QCheckBox(Tr::tr("Format edited code on file save"));
@@ -50,7 +57,10 @@ ClangFormatGlobalConfigWidget::ClangFormatGlobalConfigWidget(
         title(Tr::tr("ClangFormat settings:")),
         Column {
             m_useGlobalSettings,
-            Row { m_formattingModeLabel, m_indentingOrFormatting, st },
+            Form {
+                 m_formattingModeLabel, m_indentingOrFormatting, st, br,
+                 m_fileSizeThresholdLabel, m_fileSizeThresholdSpinBox, st, br
+            },
             m_formatWhileTyping,
             m_formatOnSave,
             m_projectHasClangFormat,
@@ -67,6 +77,7 @@ ClangFormatGlobalConfigWidget::ClangFormatGlobalConfigWidget(
     initIndentationOrFormattingCombobox();
     initOverrideCheckBox();
     initUseGlobalSettingsCheckBox();
+    initFileSizeThresholdSpinBox();
 
     if (project) {
         m_formattingModeLabel->hide();
@@ -139,6 +150,23 @@ void ClangFormatGlobalConfigWidget::initUseGlobalSettingsCheckBox()
             });
 }
 
+void ClangFormatGlobalConfigWidget::initFileSizeThresholdSpinBox()
+{
+    m_fileSizeThresholdSpinBox->setMinimum(1);
+    m_fileSizeThresholdSpinBox->setMaximum(std::numeric_limits<int>::max());
+    m_fileSizeThresholdSpinBox->setSuffix(" KB");
+    m_fileSizeThresholdSpinBox->setValue(ClangFormatSettings::instance().fileSizeThreshold());
+    if (m_project)
+        m_fileSizeThresholdSpinBox->hide();
+
+    connect(m_indentingOrFormatting, &QComboBox::currentIndexChanged, this, [this](int index) {
+        m_fileSizeThresholdLabel->setEnabled(
+            index != static_cast<int>(ClangFormatSettings::Mode::Disable));
+        m_fileSizeThresholdSpinBox->setEnabled(
+            index != static_cast<int>(ClangFormatSettings::Mode::Disable));
+    });
+}
+
 bool ClangFormatGlobalConfigWidget::projectClangFormatFileExists()
 {
     llvm::Expected<clang::format::FormatStyle> styleFromProjectFolder
@@ -215,6 +243,7 @@ void ClangFormatGlobalConfigWidget::apply()
         settings.setMode(
             static_cast<ClangFormatSettings::Mode>(m_indentingOrFormatting->currentIndex()));
         settings.setOverrideDefaultFile(m_overrideDefault->isChecked());
+        settings.setFileSizeThreshold(m_fileSizeThresholdSpinBox->value());
         m_overrideDefaultFile = m_overrideDefault->isChecked();
     }
     settings.write();
diff --git a/src/plugins/clangformat/clangformatglobalconfigwidget.h b/src/plugins/clangformat/clangformatglobalconfigwidget.h
index 7b2d6fe7c9c..e4a7be50478 100644
--- a/src/plugins/clangformat/clangformatglobalconfigwidget.h
+++ b/src/plugins/clangformat/clangformatglobalconfigwidget.h
@@ -13,6 +13,7 @@ QT_BEGIN_NAMESPACE
 class QCheckBox;
 class QComboBox;
 class QLabel;
+class QSpinBox;
 QT_END_NAMESPACE
 
 namespace ProjectExplorer { class Project; }
@@ -37,6 +38,7 @@ private:
     void initIndentationOrFormattingCombobox();
     void initOverrideCheckBox();
     void initUseGlobalSettingsCheckBox();
+    void initFileSizeThresholdSpinBox();
 
     bool projectClangFormatFileExists();
 
@@ -47,6 +49,8 @@ private:
 
     QLabel *m_projectHasClangFormat;
     QLabel *m_formattingModeLabel;
+    QLabel *m_fileSizeThresholdLabel;
+    QSpinBox *m_fileSizeThresholdSpinBox;
     QComboBox *m_indentingOrFormatting;
     QCheckBox *m_formatWhileTyping;
     QCheckBox *m_formatOnSave;
diff --git a/src/plugins/clangformat/clangformatindenter.cpp b/src/plugins/clangformat/clangformatindenter.cpp
index 67d5171b010..35f0c8b1ede 100644
--- a/src/plugins/clangformat/clangformatindenter.cpp
+++ b/src/plugins/clangformat/clangformatindenter.cpp
@@ -130,7 +130,8 @@ TextEditor::Indenter *ClangFormatForwardingIndenter::currentIndenter() const
 {
     ClangFormatSettings::Mode mode = getCurrentIndentationOrFormattingSettings(m_fileName);
 
-    if (mode == ClangFormatSettings::Disable)
+    if (mode == ClangFormatSettings::Disable
+        || m_fileName.fileSize() >= ClangFormatSettings::instance().fileSizeThreshold() * 1024)
         return m_cppIndenter.get();
 
     return m_clangFormatIndenter.get();
diff --git a/src/plugins/clangformat/clangformatsettings.cpp b/src/plugins/clangformat/clangformatsettings.cpp
index 4f4ea8ac232..1c76d14df6b 100644
--- a/src/plugins/clangformat/clangformatsettings.cpp
+++ b/src/plugins/clangformat/clangformatsettings.cpp
@@ -25,6 +25,8 @@ ClangFormatSettings::ClangFormatSettings()
                               .toBool();
     m_formatOnSave = settings->value(QLatin1String(Constants::FORMAT_CODE_ON_SAVE_ID), false)
                          .toBool();
+    m_fileSizeThreshold
+        = settings->value(QLatin1String(Constants::FILE_SIZE_THREDSHOLD), 1024).toInt();
 
     // Convert old settings to new ones. New settings were added to QtC 8.0
     bool isOldFormattingOn
@@ -51,6 +53,7 @@ void ClangFormatSettings::write() const
     settings->setValue(QLatin1String(Constants::FORMAT_WHILE_TYPING_ID), m_formatWhileTyping);
     settings->setValue(QLatin1String(Constants::FORMAT_CODE_ON_SAVE_ID), m_formatOnSave);
     settings->setValue(QLatin1String(Constants::MODE_ID), static_cast<int>(m_mode));
+    settings->setValue(QLatin1String(Constants::FILE_SIZE_THREDSHOLD), m_fileSizeThreshold);
     settings->endGroup();
 }
 
@@ -94,4 +97,14 @@ ClangFormatSettings::Mode ClangFormatSettings::mode() const
     return m_mode;
 }
 
+void ClangFormatSettings::setFileSizeThreshold(int fileSizeInKb)
+{
+    m_fileSizeThreshold = fileSizeInKb;
+}
+
+int ClangFormatSettings::fileSizeThreshold() const
+{
+    return m_fileSizeThreshold;
+}
+
 } // namespace ClangFormat
diff --git a/src/plugins/clangformat/clangformatsettings.h b/src/plugins/clangformat/clangformatsettings.h
index c2ce53f4c76..07e854df461 100644
--- a/src/plugins/clangformat/clangformatsettings.h
+++ b/src/plugins/clangformat/clangformatsettings.h
@@ -33,11 +33,15 @@ public:
     void setFormatOnSave(bool enable);
     bool formatOnSave() const;
 
+    void setFileSizeThreshold(int fileSizeInKb);
+    int fileSizeThreshold() const;
+
 private:
     Mode m_mode;
     bool m_overrideDefaultFile = false;
     bool m_formatWhileTyping = false;
     bool m_formatOnSave = false;
+    int m_fileSizeThreshold = 1024;
 };
 
 } // namespace ClangFormat