diff --git a/src/gui/text/coretext/qcoretextfontdatabase.mm b/src/gui/text/coretext/qcoretextfontdatabase.mm
index baf2803d570..0301b2e61e0 100644
--- a/src/gui/text/coretext/qcoretextfontdatabase.mm
+++ b/src/gui/text/coretext/qcoretextfontdatabase.mm
@@ -361,7 +361,7 @@ static void getFontDescription(CTFontDescriptorRef font, FontDescription *fd)
     fd->fixedPitch = false;
 
     if (QCFType<CTFontRef> tempFont = CTFontCreateWithFontDescriptor(font, 0.0, 0)) {
-        uint tag = MAKE_TAG('O', 'S', '/', '2');
+        uint tag = QFont::Tag("OS/2").value();
         CTFontRef tempFontRef = tempFont;
         void *userData = reinterpret_cast<void *>(&tempFontRef);
         uint length = 128;
diff --git a/src/gui/text/coretext/qfontengine_coretext.mm b/src/gui/text/coretext/qfontengine_coretext.mm
index 6cdba2609dc..1ba1c739762 100644
--- a/src/gui/text/coretext/qfontengine_coretext.mm
+++ b/src/gui/text/coretext/qfontengine_coretext.mm
@@ -232,7 +232,7 @@ void QCoreTextFontEngine::init()
         synthesisFlags |= SynthesizedItalic;
 
     avgCharWidth = 0;
-    QByteArray os2Table = getSfntTable(MAKE_TAG('O', 'S', '/', '2'));
+    QByteArray os2Table = getSfntTable(QFont::Tag("OS/2").value());
     unsigned emSize = CTFontGetUnitsPerEm(ctfont);
     if (os2Table.size() >= 10) {
         fsType = qFromBigEndian<quint16>(os2Table.constData() + 8);
diff --git a/src/gui/text/freetype/qfontengine_ft.cpp b/src/gui/text/freetype/qfontengine_ft.cpp
index f3a80d925d5..3c01392e46b 100644
--- a/src/gui/text/freetype/qfontengine_ft.cpp
+++ b/src/gui/text/freetype/qfontengine_ft.cpp
@@ -767,7 +767,7 @@ static FT_UShort calculateActualWeight(FT_Face face, QFontEngine::FaceId faceId)
         FT_Get_MM_Var(face, &var);
         if (var != nullptr && FT_UInt(faceId.instanceIndex) < var->num_namedstyles) {
             for (FT_UInt axis = 0; axis < var->num_axis; ++axis) {
-                if (var->axis[axis].tag == MAKE_TAG('w', 'g', 'h', 't')) {
+                if (var->axis[axis].tag == QFont::Tag("wght").value()) {
                     return var->namedstyle[faceId.instanceIndex].coords[axis] >> 16;
                 }
             }
@@ -787,7 +787,7 @@ static bool calculateActualItalic(FT_Face face, QFontEngine::FaceId faceId)
         FT_Get_MM_Var(face, &var);
         if (var != nullptr && FT_UInt(faceId.instanceIndex) < var->num_namedstyles) {
             for (FT_UInt axis = 0; axis < var->num_axis; ++axis) {
-                if (var->axis[axis].tag == MAKE_TAG('i', 't', 'a', 'l')) {
+                if (var->axis[axis].tag == QFont::Tag("ital").value()) {
                     return (var->namedstyle[faceId.instanceIndex].coords[axis] >> 16) == 1;
                 }
             }
diff --git a/src/gui/text/freetype/qfreetypefontdatabase.cpp b/src/gui/text/freetype/qfreetypefontdatabase.cpp
index df64d2ce90f..f7d592a761c 100644
--- a/src/gui/text/freetype/qfreetypefontdatabase.cpp
+++ b/src/gui/text/freetype/qfreetypefontdatabase.cpp
@@ -114,11 +114,11 @@ void QFreeTypeFontDatabase::addNamedInstancesForFace(void *face_,
            QFont::Stretch instanceStretch = stretch;
            QFont::Style instanceStyle = style;
            for (FT_UInt axis = 0; axis < var->num_axis; ++axis) {
-               if (var->axis[axis].tag == MAKE_TAG('w', 'g', 'h', 't')) {
+               if (var->axis[axis].tag == QFont::Tag("wght").value()) {
                    instanceWeight = QFont::Weight(var->namedstyle[i].coords[axis] >> 16);
-               } else if (var->axis[axis].tag == MAKE_TAG('w', 'd', 't', 'h')) {
+               } else if (var->axis[axis].tag == QFont::Tag("wdth").value()) {
                    instanceStretch = QFont::Stretch(var->namedstyle[i].coords[axis] >> 16);
-               }  else if (var->axis[axis].tag == MAKE_TAG('i', 't', 'a', 'l')) {
+               }  else if (var->axis[axis].tag == QFont::Tag("ital").value()) {
                    FT_UInt ital = var->namedstyle[i].coords[axis] >> 16;
                    if (ital == 1)
                        instanceStyle = QFont::StyleItalic;
diff --git a/src/gui/text/qfont.cpp b/src/gui/text/qfont.cpp
index d144a8d79a5..04ead4468ed 100644
--- a/src/gui/text/qfont.cpp
+++ b/src/gui/text/qfont.cpp
@@ -2508,12 +2508,9 @@ void QFont::clearFeatures()
 */
 QByteArray QFont::tagToString(quint32 tag)
 {
-    char str[4] =
-        { char((tag & 0xff000000) >> 24),
-          char((tag & 0x00ff0000) >> 16),
-          char((tag & 0x0000ff00) >> 8),
-          char((tag & 0x000000ff)) };
-    return QByteArray(str, 4);
+    if (auto maybeTag = QFont::Tag::fromValue(tag))
+        return maybeTag->toString();
+    return {};
 }
 
 /*!
@@ -2531,10 +2528,9 @@ QByteArray QFont::tagToString(quint32 tag)
 */
 quint32 QFont::stringToTag(const char *name)
 {
-    if (qstrlen(name) != 4)
-        return 0;
-
-    return MAKE_TAG(name[0], name[1], name[2], name[3]);
+    if (auto maybeTag = QFont::Tag::fromString(name))
+        return maybeTag->value();
+    return 0;
 }
 
 extern QStringList qt_fallbacksForFamily(const QString &family, QFont::Style style,
diff --git a/src/gui/text/qfontengine.cpp b/src/gui/text/qfontengine.cpp
index 8f2336f2ace..ca9dc6afc9d 100644
--- a/src/gui/text/qfontengine.cpp
+++ b/src/gui/text/qfontengine.cpp
@@ -182,8 +182,10 @@ bool QFontEngine::supportsScript(QChar::Script script) const
 #if QT_CONFIG(harfbuzz)
     // in AAT fonts, 'gsub' table is effectively replaced by 'mort'/'morx' table
     uint lenMort = 0, lenMorx = 0;
-    if (getSfntTableData(MAKE_TAG('m','o','r','t'), nullptr, &lenMort) || getSfntTableData(MAKE_TAG('m','o','r','x'), nullptr, &lenMorx))
+    if (getSfntTableData(QFont::Tag("mort").value(), nullptr, &lenMort)
+     || getSfntTableData(QFont::Tag("morx").value(), nullptr, &lenMorx)) {
         return true;
+    }
 
     if (hb_face_t *face = hb_qt_face_get_for_engine(const_cast<QFontEngine *>(this))) {
         unsigned int script_count = HB_OT_MAX_TAGS_PER_SCRIPT;
@@ -381,7 +383,7 @@ void QFontEngine::getGlyphBearings(glyph_t glyph, qreal *leftBearing, qreal *rig
 
 bool QFontEngine::processHheaTable() const
 {
-    QByteArray hhea = getSfntTable(MAKE_TAG('h', 'h', 'e', 'a'));
+    QByteArray hhea = getSfntTable(QFont::Tag("hhea").value());
     if (hhea.size() >= 10) {
         auto ptr = hhea.constData();
         qint16 ascent = qFromBigEndian<qint16>(ptr + 4);
@@ -407,9 +409,9 @@ bool QFontEngine::processHheaTable() const
 void QFontEngine::initializeHeightMetrics() const
 {
     bool hasEmbeddedBitmaps =
-            !getSfntTable(MAKE_TAG('E', 'B', 'L', 'C')).isEmpty()
-            || !getSfntTable(MAKE_TAG('C', 'B', 'L', 'C')).isEmpty()
-            || !getSfntTable(MAKE_TAG('b', 'd', 'a', 't')).isEmpty();
+            !getSfntTable(QFont::Tag("EBLC").value()).isEmpty()
+            || !getSfntTable(QFont::Tag("CBLC").value()).isEmpty()
+            || !getSfntTable(QFont::Tag("bdat").value()).isEmpty();
     if (!hasEmbeddedBitmaps) {
         // Get HHEA table values if available
         processHheaTable();
@@ -429,7 +431,7 @@ void QFontEngine::initializeHeightMetrics() const
 
 bool QFontEngine::processOS2Table() const
 {
-    QByteArray os2 = getSfntTable(MAKE_TAG('O', 'S', '/', '2'));
+    QByteArray os2 = getSfntTable(QFont::Tag("OS/2").value());
     if (os2.size() >= 78) {
         auto ptr = os2.constData();
         quint16 fsSelection = qFromBigEndian<quint16>(ptr + 62);
@@ -505,7 +507,7 @@ qreal QFontEngine::minRightBearing() const
     if (m_minRightBearing == kBearingNotInitialized) {
 
         // Try the 'hhea' font table first, which covers the entire font
-        QByteArray hheaTable = getSfntTable(MAKE_TAG('h', 'h', 'e', 'a'));
+        QByteArray hheaTable = getSfntTable(QFont::Tag("hhea").value());
         if (hheaTable.size() >= int(kMinRightSideBearingOffset + sizeof(qint16))) {
             const uchar *tableData = reinterpret_cast<const uchar *>(hheaTable.constData());
             Q_ASSERT(q16Dot16ToFloat(qFromBigEndian<quint32>(tableData)) == 1.0);
@@ -1045,7 +1047,7 @@ void QFontEngine::loadKerningPairs(QFixed scalingFactor)
 {
     kerning_pairs.clear();
 
-    QByteArray tab = getSfntTable(MAKE_TAG('k', 'e', 'r', 'n'));
+    QByteArray tab = getSfntTable(QFont::Tag("kern").value());
     if (tab.isEmpty())
         return;
 
@@ -1134,7 +1136,7 @@ end:
 
 int QFontEngine::glyphCount() const
 {
-    QByteArray maxpTable = getSfntTable(MAKE_TAG('m', 'a', 'x', 'p'));
+    QByteArray maxpTable = getSfntTable(QFont::Tag("maxp").value());
     if (maxpTable.size() < 6)
         return 0;
 
diff --git a/src/gui/text/qfontengine_p.h b/src/gui/text/qfontengine_p.h
index bf6514a0bdd..1b79ffd14a0 100644
--- a/src/gui/text/qfontengine_p.h
+++ b/src/gui/text/qfontengine_p.h
@@ -29,13 +29,6 @@ class QFontEngineGlyphCache;
 
 struct QGlyphLayout;
 
-#define MAKE_TAG(ch1, ch2, ch3, ch4) (\
-    (((quint32)(ch1)) << 24) | \
-    (((quint32)(ch2)) << 16) | \
-    (((quint32)(ch3)) << 8) | \
-    ((quint32)(ch4)) \
-   )
-
 // ### this only used in getPointInOutline(), refactor it and then remove these magic numbers
 enum HB_Compat_Error {
     Err_Ok                           = 0x0000,
diff --git a/src/gui/text/qfontsubset.cpp b/src/gui/text/qfontsubset.cpp
index a8efecce8c9..f6c973e5229 100644
--- a/src/gui/text/qfontsubset.cpp
+++ b/src/gui/text/qfontsubset.cpp
@@ -401,7 +401,7 @@ static QTtfTable generateHead(const qttf_head_table &head)
 {
     const int head_size = 54;
     QTtfTable t;
-    t.tag = MAKE_TAG('h', 'e', 'a', 'd');
+    t.tag = QFont::Tag("head").value();
     t.data.resize(head_size);
 
     QTtfStream s(t.data);
@@ -472,7 +472,7 @@ static QTtfTable generateHhea(const qttf_hhea_table &hhea)
 {
     const int hhea_size = 36;
     QTtfTable t;
-    t.tag = MAKE_TAG('h', 'h', 'e', 'a');
+    t.tag = QFont::Tag("hhea").value();
     t.data.resize(hhea_size);
 
     QTtfStream s(t.data);
@@ -523,7 +523,7 @@ static QTtfTable generateMaxp(const qttf_maxp_table &maxp)
 {
     const int maxp_size = 32;
     QTtfTable t;
-    t.tag = MAKE_TAG('m', 'a', 'x', 'p');
+    t.tag = QFont::Tag("maxp").value();
     t.data.resize(maxp_size);
 
     QTtfStream s(t.data);
@@ -603,7 +603,7 @@ static QTtfTable generateName(const QList<QTtfNameRecord> &name)
     const int char_size = 2;
 
     QTtfTable t;
-    t.tag = MAKE_TAG('n', 'a', 'm', 'e');
+    t.tag = QFont::Tag("name").value();
 
     const int name_size = 6 + 12*name.size();
     int string_size = 0;
@@ -958,15 +958,15 @@ static QList<QTtfTable> generateGlyphTables(qttf_font_tables &tables, const QLis
     tables.hhea.numberOfHMetrics = nGlyphs;
 
     QTtfTable glyf;
-    glyf.tag = MAKE_TAG('g', 'l', 'y', 'f');
+    glyf.tag = QFont::Tag("glyf").value();
 
     QTtfTable loca;
-    loca.tag = MAKE_TAG('l', 'o', 'c', 'a');
+    loca.tag = QFont::Tag("loca").value();
     loca.data.resize(glyf_size < max_size_small ? (nGlyphs+1)*sizeof(quint16) : (nGlyphs+1)*sizeof(quint32));
     QTtfStream ls(loca.data);
 
     QTtfTable hmtx;
-    hmtx.tag = MAKE_TAG('h', 'm', 't', 'x');
+    hmtx.tag = QFont::Tag("hmtx").value();
     hmtx.data.resize(nGlyphs*4);
     QTtfStream hs(hmtx.data);
 
@@ -1066,7 +1066,7 @@ static QByteArray bindFont(const QList<QTtfTable>& _tables)
         for (int i = 0; i < tables.size(); ++i) {
             const QTtfTable &t = tables.at(i);
             const quint32 size = (t.data.size() + 3) & ~3;
-            if (t.tag == MAKE_TAG('h', 'e', 'a', 'd'))
+            if (t.tag == QFont::Tag("head").value())
                 head_offset = table_offset;
             f << t.tag
               << checksum(t.data)
@@ -1186,7 +1186,7 @@ QByteArray QFontSubset::toTruetype() const
     tables.append(generateMaxp(font.maxp));
     // name
     QTtfTable name_table;
-    name_table.tag = MAKE_TAG('n', 'a', 'm', 'e');
+    name_table.tag = QFont::Tag("name").value();
     if (!noEmbed)
         name_table.data = fontEngine->getSfntTable(name_table.tag);
     if (name_table.data.isEmpty()) {
@@ -1204,7 +1204,7 @@ QByteArray QFontSubset::toTruetype() const
 
     if (!noEmbed) {
         QTtfTable os2;
-        os2.tag = MAKE_TAG('O', 'S', '/', '2');
+        os2.tag = QFont::Tag("OS/2").value();
         os2.data = fontEngine->getSfntTable(os2.tag);
         if (!os2.data.isEmpty())
             tables.append(os2);
diff --git a/src/gui/text/qrawfont.cpp b/src/gui/text/qrawfont.cpp
index e58f9187e9e..99cd87f1b27 100644
--- a/src/gui/text/qrawfont.cpp
+++ b/src/gui/text/qrawfont.cpp
@@ -642,7 +642,9 @@ QByteArray QRawFont::fontTable(const char *tagName) const
     if (!d->isValid())
         return QByteArray();
 
-    return d->fontEngine->getSfntTable(MAKE_TAG(tagName[0], tagName[1], tagName[2], tagName[3]));
+    if (auto maybeTag = QFont::Tag::fromString(tagName))
+        return d->fontEngine->getSfntTable(maybeTag->value());
+    return {};
 }
 
 /*!
diff --git a/src/gui/text/windows/qwindowsfontengine.cpp b/src/gui/text/windows/qwindowsfontengine.cpp
index 1f24cc85c59..fe078973696 100644
--- a/src/gui/text/windows/qwindowsfontengine.cpp
+++ b/src/gui/text/windows/qwindowsfontengine.cpp
@@ -104,7 +104,7 @@ void QWindowsFontEngine::getCMap()
     SelectObject(hdc, hfont);
     bool symb = false;
     if (ttf) {
-        cmapTable = getSfntTable(MAKE_TAG('c', 'm', 'a', 'p'));
+        cmapTable = getSfntTable(QFont::Tag("cmap").value());
         cmap = QFontEngine::getCMap(reinterpret_cast<const uchar *>(cmapTable.constData()),
                        cmapTable.size(), &symb, &cmapSize);
     }
@@ -471,7 +471,7 @@ namespace {
 
 QFixed QWindowsFontEngine::capHeight() const
 {
-    const QByteArray tableData = getSfntTable(MAKE_TAG('O', 'S', '/', '2'));
+    const QByteArray tableData = getSfntTable(QFont::Tag("OS/2").value());
     if (size_t(tableData.size()) >= sizeof(OS2Table)) {
         const OS2Table *table = reinterpret_cast<const OS2Table *>(tableData.constData());
         if (qFromBigEndian<quint16>(table->version) >= 2) {
diff --git a/src/gui/text/windows/qwindowsfontenginedirectwrite.cpp b/src/gui/text/windows/qwindowsfontenginedirectwrite.cpp
index 9c4ca33f91c..a93cf16594f 100644
--- a/src/gui/text/windows/qwindowsfontenginedirectwrite.cpp
+++ b/src/gui/text/windows/qwindowsfontenginedirectwrite.cpp
@@ -359,7 +359,7 @@ void QWindowsFontEngineDirectWrite::collectMetrics()
         fontFile->Release();
     }
 
-    QByteArray table = getSfntTable(MAKE_TAG('h', 'h', 'e', 'a'));
+    QByteArray table = getSfntTable(QFont::Tag("hhea").value());
     const int advanceWidthMaxLocation = 10;
     if (table.size() >= advanceWidthMaxLocation + int(sizeof(quint16))) {
         quint16 advanceWidthMax = qFromBigEndian<quint16>(table.constData() + advanceWidthMaxLocation);
diff --git a/tests/manual/fontfeatures/mainwindow.cpp b/tests/manual/fontfeatures/mainwindow.cpp
index 534cee88c46..474e20de652 100644
--- a/tests/manual/fontfeatures/mainwindow.cpp
+++ b/tests/manual/fontfeatures/mainwindow.cpp
@@ -27,8 +27,8 @@ void MainWindow::updateSampleText()
     for (int i = 0; i < ui->lwFeatures->count(); ++i) {
         QListWidgetItem *it = ui->lwFeatures->item(i);
         if (it->checkState() != Qt::PartiallyChecked) {
-            QByteArray ba = it->text().toLatin1();
-            font.setFeature(ba, !!it->checkState());
+            if (const auto maybeTag = QFont::Tag::fromString(it->text().toLatin1()))
+                font.setFeature(*maybeTag, !!it->checkState());
         }
     }