diff --git a/python/core/auto_generated/textrenderer/qgstextblock.sip.in b/python/core/auto_generated/textrenderer/qgstextblock.sip.in
index 497508ca838..6f34166648a 100644
--- a/python/core/auto_generated/textrenderer/qgstextblock.sip.in
+++ b/python/core/auto_generated/textrenderer/qgstextblock.sip.in
@@ -62,6 +62,13 @@ Returns ``True`` if the block is empty.
     int size() const;
 %Docstring
 Returns the number of fragments in the block.
+%End
+
+    void applyCapitalization( QgsStringUtils::Capitalization capitalization );
+%Docstring
+Applies a ``capitalization`` style to the block's text.
+
+.. versionadded:: 3.16
 %End
 
     int __len__() const;
diff --git a/python/core/auto_generated/textrenderer/qgstextdocument.sip.in b/python/core/auto_generated/textrenderer/qgstextdocument.sip.in
index 435b48a2c7d..d0d498432ed 100644
--- a/python/core/auto_generated/textrenderer/qgstextdocument.sip.in
+++ b/python/core/auto_generated/textrenderer/qgstextdocument.sip.in
@@ -113,6 +113,13 @@ argument controls whether the lines should be wrapped to an ideal maximum of ``a
 if ``False`` then the lines are wrapped to an ideal minimum length of ``autoWrapLength`` characters.
 %End
 
+    void applyCapitalization( QgsStringUtils::Capitalization capitalization );
+%Docstring
+Applies a ``capitalization`` style to the document's text.
+
+.. versionadded:: 3.16
+%End
+
 
 };
 
diff --git a/python/core/auto_generated/textrenderer/qgstextfragment.sip.in b/python/core/auto_generated/textrenderer/qgstextfragment.sip.in
index 594e41595a9..a9054299ee6 100644
--- a/python/core/auto_generated/textrenderer/qgstextfragment.sip.in
+++ b/python/core/auto_generated/textrenderer/qgstextfragment.sip.in
@@ -76,6 +76,13 @@ The optional ``scaleFactor`` parameter can specify a font size scaling factor. I
 QgsTextRenderer.FONT_WORKAROUND_SCALE and then manually calculations
 based on the resultant font metrics. Failure to do so will result in poor quality text rendering
 at small font sizes.
+%End
+
+    void applyCapitalization( QgsStringUtils::Capitalization capitalization );
+%Docstring
+Applies a ``capitalization`` style to the fragment's text.
+
+.. versionadded:: 3.16
 %End
 
 };
diff --git a/src/core/textrenderer/qgstextblock.cpp b/src/core/textrenderer/qgstextblock.cpp
index 673aebd5324..464bffcf970 100644
--- a/src/core/textrenderer/qgstextblock.cpp
+++ b/src/core/textrenderer/qgstextblock.cpp
@@ -56,6 +56,14 @@ int QgsTextBlock::size() const
   return mFragments.size();
 }
 
+void QgsTextBlock::applyCapitalization( QgsStringUtils::Capitalization capitalization )
+{
+  for ( QgsTextFragment &fragment : mFragments )
+  {
+    fragment.applyCapitalization( capitalization );
+  }
+}
+
 const QgsTextFragment &QgsTextBlock::at( int index ) const
 {
   return mFragments.at( index );
diff --git a/src/core/textrenderer/qgstextblock.h b/src/core/textrenderer/qgstextblock.h
index a879884e270..18840c35037 100644
--- a/src/core/textrenderer/qgstextblock.h
+++ b/src/core/textrenderer/qgstextblock.h
@@ -19,6 +19,7 @@
 #include "qgis_sip.h"
 #include "qgis_core.h"
 #include "qgstextfragment.h"
+#include "qgsstringutils.h"
 #include <QVector>
 
 /**
@@ -78,6 +79,13 @@ class CORE_EXPORT QgsTextBlock
      */
     int size() const;
 
+    /**
+     * Applies a \a capitalization style to the block's text.
+     *
+     * \since QGIS 3.16
+     */
+    void applyCapitalization( QgsStringUtils::Capitalization capitalization );
+
 #ifdef SIP_RUN
     int __len__() const;
     % MethodCode
diff --git a/src/core/textrenderer/qgstextdocument.cpp b/src/core/textrenderer/qgstextdocument.cpp
index cf25e7ae84c..0c9f4fbb873 100644
--- a/src/core/textrenderer/qgstextdocument.cpp
+++ b/src/core/textrenderer/qgstextdocument.cpp
@@ -187,6 +187,14 @@ void QgsTextDocument::splitLines( const QString &wrapCharacter, int autoWrapLeng
   }
 }
 
+void QgsTextDocument::applyCapitalization( QgsStringUtils::Capitalization capitalization )
+{
+  for ( QgsTextBlock &block : mBlocks )
+  {
+    block.applyCapitalization( capitalization );
+  }
+}
+
 ///@cond PRIVATE
 QVector< QgsTextBlock >::const_iterator QgsTextDocument::begin() const
 {
diff --git a/src/core/textrenderer/qgstextdocument.h b/src/core/textrenderer/qgstextdocument.h
index 173bc557af8..43df966f88d 100644
--- a/src/core/textrenderer/qgstextdocument.h
+++ b/src/core/textrenderer/qgstextdocument.h
@@ -18,6 +18,7 @@
 
 #include "qgis_sip.h"
 #include "qgis_core.h"
+#include "qgsstringutils.h"
 
 #include <QVector>
 
@@ -137,6 +138,13 @@ class CORE_EXPORT QgsTextDocument
      */
     void splitLines( const QString &wrapCharacter, int autoWrapLength = 0, bool useMaxLineLengthWhenAutoWrapping = true );
 
+    /**
+     * Applies a \a capitalization style to the document's text.
+     *
+     * \since QGIS 3.16
+     */
+    void applyCapitalization( QgsStringUtils::Capitalization capitalization );
+
 #ifndef SIP_RUN
     ///@cond PRIVATE
     QVector< QgsTextBlock >::const_iterator begin() const;
diff --git a/src/core/textrenderer/qgstextfragment.cpp b/src/core/textrenderer/qgstextfragment.cpp
index 8029a66c892..8bd412f1e46 100644
--- a/src/core/textrenderer/qgstextfragment.cpp
+++ b/src/core/textrenderer/qgstextfragment.cpp
@@ -68,3 +68,8 @@ double QgsTextFragment::horizontalAdvance( const QFont &font, bool fontHasBeenUp
   }
 }
 
+void QgsTextFragment::applyCapitalization( QgsStringUtils::Capitalization capitalization )
+{
+  mText = QgsStringUtils::capitalize( mText, capitalization );
+}
+
diff --git a/src/core/textrenderer/qgstextfragment.h b/src/core/textrenderer/qgstextfragment.h
index ede938ef210..71a10f2023d 100644
--- a/src/core/textrenderer/qgstextfragment.h
+++ b/src/core/textrenderer/qgstextfragment.h
@@ -19,6 +19,7 @@
 #include "qgis_sip.h"
 #include "qgis_core.h"
 #include "qgstextcharacterformat.h"
+#include "qgsstringutils.h"
 
 class QTextFragment;
 
@@ -87,6 +88,13 @@ class CORE_EXPORT QgsTextFragment
      */
     double horizontalAdvance( const QFont &font, bool fontHasBeenUpdatedForFragment = false, double scaleFactor = 1.0 ) const;
 
+    /**
+     * Applies a \a capitalization style to the fragment's text.
+     *
+     * \since QGIS 3.16
+     */
+    void applyCapitalization( QgsStringUtils::Capitalization capitalization );
+
   private:
 
     QString mText;
diff --git a/tests/src/python/test_qgstextblock.py b/tests/src/python/test_qgstextblock.py
index 4dd73ce3b28..73ade38cee8 100644
--- a/tests/src/python/test_qgstextblock.py
+++ b/tests/src/python/test_qgstextblock.py
@@ -16,7 +16,8 @@ import qgis  # NOQA
 
 from qgis.core import (
     QgsTextBlock,
-    QgsTextFragment
+    QgsTextFragment,
+    QgsStringUtils
 )
 from qgis.testing import start_app, unittest
 
@@ -85,6 +86,13 @@ class TestQgsTextBlock(unittest.TestCase):
         self.assertEqual(len(block), 0)
         self.assertTrue(block.empty())
 
+    def testCapitalize(self):
+        fragment = QgsTextFragment('ludicrous gibs!')
+        block = QgsTextBlock(fragment)
+        block.append(QgsTextFragment('another part'))
+        block.applyCapitalization(QgsStringUtils.TitleCase)
+        self.assertEqual(block.toPlainText(), 'Ludicrous Gibs!Another Part')
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/src/python/test_qgstextdocument.py b/tests/src/python/test_qgstextdocument.py
index 56c6a2b4bc3..a5a65f166c5 100644
--- a/tests/src/python/test_qgstextdocument.py
+++ b/tests/src/python/test_qgstextdocument.py
@@ -18,7 +18,8 @@ from qgis.core import (
     QgsTextDocument,
     QgsTextBlock,
     QgsTextFragment,
-    QgsTextCharacterFormat
+    QgsTextCharacterFormat,
+    QgsStringUtils
 )
 from qgis.testing import start_app, unittest
 
@@ -160,6 +161,11 @@ class TestQgsTextDocument(unittest.TestCase):
         self.assertEqual(len(doc[2]), 1)
         self.assertEqual(doc[2][0].text(), 'red')
 
+    def testCapitalize(self):
+        doc = QgsTextDocument.fromPlainText(['abc def ghi', 'more text', 'another block'])
+        doc.applyCapitalization(QgsStringUtils.TitleCase)
+        self.assertEqual(doc.toPlainText(), ['Abc Def Ghi', 'More Text', 'Another Block'])
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/src/python/test_qgstextfragment.py b/tests/src/python/test_qgstextfragment.py
index e53f8097d0d..a54a9585b95 100644
--- a/tests/src/python/test_qgstextfragment.py
+++ b/tests/src/python/test_qgstextfragment.py
@@ -16,7 +16,8 @@ import qgis  # NOQA
 
 from qgis.core import (
     QgsTextFragment,
-    QgsTextCharacterFormat
+    QgsTextCharacterFormat,
+    QgsStringUtils
 )
 from qgis.PyQt.QtGui import QColor
 from qgis.testing import start_app, unittest
@@ -49,6 +50,11 @@ class TestQgsTextFragment(unittest.TestCase):
         self.assertTrue(fragment.characterFormat().textColor().isValid())
         self.assertEqual(fragment.characterFormat().textColor().name(), '#ff0000')
 
+    def testCapitalize(self):
+        fragment = QgsTextFragment('ludicrous gibs!')
+        fragment.applyCapitalization(QgsStringUtils.TitleCase)
+        self.assertEqual(fragment.text(), 'Ludicrous Gibs!')
+
 
 if __name__ == '__main__':
     unittest.main()