diff --git a/src/numberformat.h b/src/numberformat.h
new file mode 100644
--- /dev/null
+++ b/src/numberformat.h
@@ -0,0 +1,43 @@
+/*
+  Copyright © 2016 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot 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.
+
+  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef NUMBERFORMAT_H
+#define NUMBERFORMAT_H
+
+#include <QString>
+
+enum NumberFormat
+{
+    NumberFormat_uint8,
+    NumberFormat_uint16,
+    NumberFormat_uint32,
+    NumberFormat_int8,
+    NumberFormat_int16,
+    NumberFormat_int32,
+    NumberFormat_float,
+    NumberFormat_INVALID ///< used for error cases
+};
+
+/// Convert `NumberFormat` to string for representation
+QString numberFormatToStr(NumberFormat nf);
+
+/// Convert string to `NumberFormat`
+NumberFormat strToNumberFormat(QString str);
+
+#endif // NUMBERFORMAT_H