diff --git a/19_tsv-to-csv.py b/19_tsv-to-csv.py
new file mode 100644
index 0000000..f10deed
--- /dev/null
+++ b/19_tsv-to-csv.py
@@ -0,0 +1,16 @@
+import os
+import sys
+import csv
+
+
+def convert(input, out):
+    if os.path.exists(out):
+        raise ValueError("Output file already exists")
+
+    reader = csv.reader(open(input, 'rU'), dialect=csv.excel_tab)
+    writer = csv.writer(open(out, "wb+"), dialect="excel")
+    for row in reader:
+        writer.writerow(row)
+
+if __name__ == "__main__":
+    convert(sys.argv[1], sys.argv[2])