diff --git a/tools/migrations/int2pid-csv2bin.py b/tools/migrations/int2pid-csv2bin.py
new file mode 100755
index 0000000..bcd3d18
--- /dev/null
+++ b/tools/migrations/int2pid-csv2bin.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2019  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+"""Convert a textual int->PID map (as a simple list of textual PIDs), to the
+binary format of :class:`swh.graph.pid.IntToPidMap`.
+
+"""
+
+import sys
+
+from swh.graph.pid import IntToPidMap
+
+
+def main(fname):
+    with open(fname, 'wb') as f:
+        for line in sys.stdin:
+            pid = line.rstrip()
+            IntToPidMap.write_record(f, pid)
+
+
+if __name__ == '__main__':
+    main(sys.argv[1])
diff --git a/tools/migrations/pid2int-csv2bin.py b/tools/migrations/pid2int-csv2bin.py
new file mode 100755
index 0000000..8f6c475
--- /dev/null
+++ b/tools/migrations/pid2int-csv2bin.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2019  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+"""Convert a textual PID->int map (as a list of space-separated <PID, int>
+textual pairs), to the binary format of :class:`swh.graph.pid.PidToIntMap`.
+
+"""
+
+import sys
+
+from swh.graph.pid import PidToIntMap
+
+
+def main(fname):
+    with open(fname, 'wb') as f:
+        for line in sys.stdin:
+            (pid, int_str) = line.rstrip().split(maxsplit=1)
+            PidToIntMap.write_record(f, pid, int(int_str))
+
+
+if __name__ == '__main__':
+    main(sys.argv[1])