diff --git a/novelwriter/constants.py b/novelwriter/constants.py
index 2f409d9a..9a871e4d 100644
--- a/novelwriter/constants.py
+++ b/novelwriter/constants.py
@@ -99,6 +99,7 @@ class nwHeaders:
 
     H_VALID = ("H0", "H1", "H2", "H3", "H4")
     H_LEVEL = {"H0": 0, "H1": 1, "H2": 2, "H3": 3, "H4": 4}
+    H_SIZES = {0: 1.00, 1: 2.00, 2: 1.75, 3: 1.50, 4: 1.25}
 
 
 class nwFiles:
diff --git a/novelwriter/gui/dochighlight.py b/novelwriter/gui/dochighlight.py
index 0e731032..c00f7b44 100644
--- a/novelwriter/gui/dochighlight.py
+++ b/novelwriter/gui/dochighlight.py
@@ -36,7 +36,7 @@ from PyQt5.QtGui import (
 
 from novelwriter import CONFIG, SHARED
 from novelwriter.common import checkInt
-from novelwriter.constants import nwRegEx, nwUnicode
+from novelwriter.constants import nwHeaders, nwRegEx, nwUnicode
 from novelwriter.core.index import processComment
 from novelwriter.enum import nwComment
 from novelwriter.types import QRegExUnicode
@@ -95,14 +95,14 @@ class GuiDocHighlighter(QSyntaxHighlighter):
 
         # Create Character Formats
         self._addCharFormat("text",      SHARED.theme.colText)
-        self._addCharFormat("header1",   SHARED.theme.colHead, "b", 1.8)
-        self._addCharFormat("header2",   SHARED.theme.colHead, "b", 1.6)
-        self._addCharFormat("header3",   SHARED.theme.colHead, "b", 1.4)
-        self._addCharFormat("header4",   SHARED.theme.colHead, "b", 1.2)
-        self._addCharFormat("head1h",    SHARED.theme.colHeadH, "b", 1.8)
-        self._addCharFormat("head2h",    SHARED.theme.colHeadH, "b", 1.6)
-        self._addCharFormat("head3h",    SHARED.theme.colHeadH, "b", 1.4)
-        self._addCharFormat("head4h",    SHARED.theme.colHeadH, "b", 1.2)
+        self._addCharFormat("header1",   SHARED.theme.colHead, "b", nwHeaders.H_SIZES[1])
+        self._addCharFormat("header2",   SHARED.theme.colHead, "b", nwHeaders.H_SIZES[2])
+        self._addCharFormat("header3",   SHARED.theme.colHead, "b", nwHeaders.H_SIZES[3])
+        self._addCharFormat("header4",   SHARED.theme.colHead, "b", nwHeaders.H_SIZES[4])
+        self._addCharFormat("head1h",    SHARED.theme.colHeadH, "b", nwHeaders.H_SIZES[1])
+        self._addCharFormat("head2h",    SHARED.theme.colHeadH, "b", nwHeaders.H_SIZES[2])
+        self._addCharFormat("head3h",    SHARED.theme.colHeadH, "b", nwHeaders.H_SIZES[3])
+        self._addCharFormat("head4h",    SHARED.theme.colHeadH, "b", nwHeaders.H_SIZES[4])
         self._addCharFormat("bold",      colEmph, "b")
         self._addCharFormat("italic",    colEmph, "i")
         self._addCharFormat("strike",    SHARED.theme.colHidden, "s")
diff --git a/novelwriter/types.py b/novelwriter/types.py
index a9fc015d..e4051f8e 100644
--- a/novelwriter/types.py
+++ b/novelwriter/types.py
@@ -24,7 +24,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
 from __future__ import annotations
 
 from PyQt5.QtCore import QRegularExpression, Qt
-from PyQt5.QtGui import QColor, QPainter, QTextCursor
+from PyQt5.QtGui import QColor, QPainter, QTextCursor, QTextFormat
 from PyQt5.QtWidgets import QDialogButtonBox, QSizePolicy, QStyle
 
 # Qt Alignment Flags
@@ -44,6 +44,11 @@ QtAlignRightMiddle = Qt.AlignmentFlag.AlignRight | Qt.AlignmentFlag.AlignVCenter
 QtAlignRightTop = Qt.AlignmentFlag.AlignRight | Qt.AlignmentFlag.AlignTop
 QtAlignTop = Qt.AlignmentFlag.AlignTop
 
+# Qt Page Break
+
+QtPageBreakBefore = QTextFormat.PageBreakFlag.PageBreak_AlwaysBefore
+QtPageBreakAfter = QTextFormat.PageBreakFlag.PageBreak_AlwaysAfter
+
 # Qt Painter Types
 
 QtTransparent = QColor(0, 0, 0, 0)