diff --git a/tools/create_r8lib.py b/tools/create_r8lib.py
new file mode 100755
index 0000000..21dd48c
--- /dev/null
+++ b/tools/create_r8lib.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+# Copyright (c) 2021, the R8 project authors. Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+import argparse
+import subprocess
+import sys
+
+import jdk
+
+
+def parse_options():
+  parser = argparse.ArgumentParser(description='Tag R8 Versions')
+  parser.add_argument(
+      '--r8jar',
+      required=True,
+      help='The R8 jar to compile')
+  parser.add_argument(
+      '--output',
+      required=True,
+      help='The output path for the r8lib')
+  parser.add_argument(
+      '--pg-conf',
+      action='append',
+      help='Keep configuration')
+  parser.add_argument(
+      '--lib',
+      action='append',
+      help='Additional libraries (JDK 1.8 rt.jar already included)')
+  return parser.parse_args()
+
+def main():
+  args = parse_options()
+  # TODO(b/139725780): See if we can remove or lower the heap size (-Xmx8g).
+  cmd = [jdk.GetJavaExecutable(), '-Xmx8g', '-ea']
+  cmd.extend(['-cp', 'build/libs/r8_with_deps.jar', 'com.android.tools.r8.R8'])
+  cmd.append(args.r8jar)
+  cmd.append('--classfile')
+  cmd.extend(['--output', args.output])
+  cmd.extend(['--pg-map-output', args.output + '.map'])
+  cmd.extend(['--lib', 'third_party/openjdk/openjdk-rt-1.8/rt.jar'])
+  if args.pg_conf:
+    for pgconf in args.pg_conf:
+      cmd.extend(['--pg-conf', pgconf])
+  if args.lib:
+    for lib in args.lib:
+      cmd.extend(['--lib', lib])
+  print(' '.join(cmd))
+  subprocess.check_call(cmd)
+
+if __name__ == '__main__':
+  sys.exit(main())