diff --git a/loadsave.cpp b/loadsave.cpp
index e5dee9e..04e4628 100644
--- a/loadsave.cpp
+++ b/loadsave.cpp
@@ -535,6 +535,58 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 	}
 }
 
+void exportM29File(QSaveFile &file, const TeletextDocument &document)
+{
+	const PageBase &subPage = *document.currentSubPage();
+	QTextStream outStream(&file);
+
+	auto writeM29Packet=[&](int designationCode)
+	{
+		if (subPage.packetExists(28, designationCode)) {
+			QByteArray outLine = subPage.packet(28, designationCode);
+
+			outStream << QString("OL,29,");
+			// TTI stores raw values with bit 6 set, doesn't do Hamming encoding
+			outLine[0] = designationCode | 0x40;
+			for (int c=1; c<outLine.size(); c++)
+				outLine[c] = outLine.at(c) | 0x40;
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+			outStream << outLine << Qt::endl;
+#else
+			outStream << outLine << endl;
+#endif
+		}
+	};
+
+	outStream.setCodec("ISO-8859-1");
+
+	if (!document.description().isEmpty())
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+	outStream << "DE," << document.description() << Qt::endl;
+#else
+	outStream << "DE," << document.description() << endl;
+#endif
+
+	// Force page number to xFF
+	outStream << QString("PN,%1ff00").arg(document.pageNumber() >> 8, 1, 16);
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+	outStream << Qt::endl;
+#else
+	outStream << endl;
+#endif
+
+	outStream << "PS,8000";
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+	outStream << Qt::endl;
+#else
+	outStream << endl;
+#endif
+
+	writeM29Packet(0);
+	writeM29Packet(1);
+	writeM29Packet(4);
+}
+
 void exportT42File(QSaveFile &file, const TeletextDocument &document)
 {
 	const PageBase &subPage = *document.currentSubPage();
diff --git a/loadsave.h b/loadsave.h
index 7b31206..c1d8a05 100644
--- a/loadsave.h
+++ b/loadsave.h
@@ -37,6 +37,7 @@ int controlBitsToPS(PageBase *);
 
 void saveTTI(QSaveFile &, const TeletextDocument &);
 void exportT42File(QSaveFile &, const TeletextDocument &);
+void exportM29File(QSaveFile &, const TeletextDocument &);
 
 QByteArray rowPacketAlways(PageBase *, int);
 
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 86e87b6..d01c126 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -27,6 +27,7 @@
 #include <QPainter>
 #include <QPushButton>
 #include <QRadioButton>
+#include <QRegExp>
 #include <QSaveFile>
 #include <QScreen>
 #include <QSettings>
@@ -353,6 +354,10 @@ void MainWindow::createActions()
 	exportPNGAct->setStatusTip("Export a PNG image of this subpage");
 	connect(exportPNGAct, &QAction::triggered, this, &MainWindow::exportPNG);
 
+	QAction *exportM29Act = fileMenu->addAction(tr("Export subpage X/28 as M/29..."));
+	exportM29Act->setStatusTip("Export this subpage's X/28 packets as a tti file with M/29 packets");
+	connect(exportM29Act, &QAction::triggered, this, &MainWindow::exportM29);
+
 	fileMenu->addSeparator();
 
 	QAction *closeAct = fileMenu->addAction(tr("&Close"), this, &QWidget::close);
@@ -1031,6 +1036,57 @@ void MainWindow::exportT42()
 		QMessageBox::warning(this, tr("QTeletextMaker"), errorMessage);
 }
 
+void MainWindow::exportM29()
+{
+	QString errorMessage;
+	QString exportFileName = m_curFile;
+
+	if (m_isUntitled || !QFileInfo(m_curFile).exists())
+		exportFileName = QString("P%1FF.tti").arg(m_textWidget->document()->pageNumber() >> 8, 1, 16);
+	else {
+		exportFileName = QFileInfo(m_curFile).fileName();
+		// Suggest a new filename to avoid clobbering the original file
+		if (QRegExp(("^[Pp]?[1-8][0-9A-Fa-f][0-9A-Fa-f]")).indexIn(exportFileName) != -1) {
+			// Page number forms start of file name, change it to xFF
+			if (exportFileName.at(0) == 'P' || exportFileName.at(0) == 'p') {
+				exportFileName[2] = 'F';
+				exportFileName[3] = 'F';
+			} else {
+				exportFileName[1] = 'F';
+				exportFileName[2] = 'F';
+			}
+		// No page number at start of file name. Try to insert "-m29" while preserving .tti(x) suffix
+		} else if (exportFileName.endsWith(".tti", Qt::CaseInsensitive)) {
+			exportFileName.chop(4);
+			exportFileName.append("-m29.tti");
+		} else if (exportFileName.endsWith(".ttix", Qt::CaseInsensitive)) {
+			exportFileName.chop(5);
+			exportFileName.append("-m29.ttix");
+		} else
+			// Shouldn't get here, bit of a messy escape but still better than clobbering the original file
+			exportFileName.append("-m29.tti");
+
+		exportFileName = QDir(QFileInfo(m_curFile).absoluteDir()).filePath(exportFileName);
+	}
+
+	exportFileName = QFileDialog::getSaveFileName(this, tr("Export M/29 tti"), exportFileName, "TTI teletext page (*.tti *.ttix)");
+	if (exportFileName.isEmpty())
+		return;
+
+	QApplication::setOverrideCursor(Qt::WaitCursor);
+	QSaveFile file(exportFileName);
+	if (file.open(QFile::WriteOnly | QFile::Text)) {
+		exportM29File(file, *m_textWidget->document());
+		if (!file.commit())
+			errorMessage = tr("Cannot write file %1:\n%2.").arg(QDir::toNativeSeparators(exportFileName), file.errorString());
+	} else
+		errorMessage = tr("Cannot open file %1 for writing:\n%2.").arg(QDir::toNativeSeparators(exportFileName), file.errorString());
+	QApplication::restoreOverrideCursor();
+
+	if (!errorMessage.isEmpty())
+		QMessageBox::warning(this, tr("QTeletextMaker"), errorMessage);
+}
+
 void MainWindow::setCurrentFile(const QString &fileName)
 {
 	static int sequenceNumber = 1;
diff --git a/mainwindow.h b/mainwindow.h
index 91be6f5..c4f5150 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -62,6 +62,7 @@ private slots:
 	void exportZXNet();
 	void exportEditTF();
 	void exportPNG();
+	void exportM29();
 	void updateRecentFileActions();
 	void openRecentFile();
 	void about();