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diff --git a/src/gui/previewwindow.h b/src/gui/previewwindow.h
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+++ b/src/gui/previewwindow.h
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+/*
+    TikZiT - a GUI diagram editor for TikZ
+    Copyright (C) 2018 Aleks Kissinger
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+/*!
+ * Displays a LaTeX-generated PDF preview using Poppler. The right-click
+ * menu has options for exporting to file or clipboard.
+ */
+
+#ifndef PREVIEWWINDOW_H
+#define PREVIEWWINDOW_H
+
+#include "pdfdocument.h"
+
+#include <QDialog>
+#include <QLabel>
+#include <QPlainTextEdit>
+#include <QContextMenuEvent>
+#include <poppler/qt5/poppler-qt5.h>
+
+namespace Ui {
+class PreviewWindow;
+}
+
+class PreviewWindow : public QDialog
+{
+    Q_OBJECT
+
+public:
+    enum Status {
+        Running, Success, Failed
+    };
+    explicit PreviewWindow(QWidget *parent = nullptr);
+    ~PreviewWindow() override;
+    void setPdf(QString file);
+    QString preparePreview(QString tikz);
+    QPlainTextEdit *outputTextEdit();
+    void setStatus(Status status);
+
+    PdfDocument *doc() const;
+
+public slots:
+    void render();
+    void exportImage();
+    void copyImageToClipboard();
+
+protected:
+    void resizeEvent(QResizeEvent *e) override;
+    void showEvent(QShowEvent *e) override;
+    void closeEvent(QCloseEvent *e) override;
+    void contextMenuEvent(QContextMenuEvent *event) override;
+private:
+    Ui::PreviewWindow *ui;
+    PdfDocument *_doc;
+    QLabel *_loader;
+};
+
+#endif // PREVIEWWINDOW_H