diff --git a/AppDir/usr/src/nmreval/io/merge_agr.py b/AppDir/usr/src/nmreval/io/merge_agr.py
new file mode 100755
index 0000000..8a52a07
--- /dev/null
+++ b/AppDir/usr/src/nmreval/io/merge_agr.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+
+import re
+import argparse
+
+
+def merger(infiles, outfile):
+    header = ''
+    graphs = ''
+    counter = 0
+    for f in infiles:
+        headerflag = True
+        for line in f.readlines():
+            if re.match('@with [Gg][0-9]', line):
+                headerflag = False
+                # one graph per file, adjust graph number
+                line = '@with g{}\n'.format(counter)
+            if headerflag:
+                if graphs == '':
+                    # save fonts, colors etc. of first file
+                    header += line
+                elif re.match('@[Gg][0-9]', line):
+                    # save graph specifications of following files
+                    line = re.sub('@[Gg][0-9]', '@g{}'.format(counter), line)
+                    header += line
+                else:
+                    pass
+            else:
+                # save sets 
+                if re.match('@target [Gg][0-9]', line):
+                    line = re.sub('@target [Gg][0-9]',
+                                  '@target G{}'.format(counter), line)
+                graphs += line
+        counter += 1
+    outfile.write(header+graphs)
+
+
+parser = argparse.ArgumentParser()
+
+parser.add_argument('input', nargs='+', type=argparse.FileType('r'),
+                    help='One or more input files')
+parser.add_argument('--output', '-o', nargs='?', type=argparse.FileType('w'),
+                    default='merger_grace.agr',
+                    help='Output file (default=merged_grace.agr)')
+
+args = parser.parse_args()
+
+merger(args.input, args.output)