diff --git a/utils/bit2fasm.py b/utils/bit2fasm.py
new file mode 100644
index 00000000..f6d1adc3
--- /dev/null
+++ b/utils/bit2fasm.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python3
+'''
+Take bitstream .bit files and decode them to FASM.
+'''
+
+import os
+import fasm
+from prjxray import db
+from prjxray import fasm_disassembler
+from prjxray import bitstream
+import subprocess
+import tempfile
+
+def bit_to_bits(bitread, part_yaml, bit_file, bits_file, frame_range=None):
+    """ Calls bitread to create bits (ASCII) from bit file (binary) """
+    if frame_range:
+        frame_range_arg = '-F {}'.format(frame_range)
+    else:
+        frame_range_arg = ''
+
+    subprocess.check_output('{} --part_file {} {} -o {} -z -y {}'.format(
+        bitread, part_yaml, frame_range_arg, bits_file, bit_file), shell=True)
+
+
+def bits_to_fasm(db_root, bits_file, verbose, canonical):
+    disassembler = fasm_disassembler.FasmDisassembler(db.Database(db_root))
+
+    with open(bits_file) as f:
+        bitdata = bitstream.load_bitdata(f)
+
+    print(
+        fasm.fasm_tuple_to_string(
+            disassembler.find_features_in_bitstream(bitdata, verbose=verbose),
+            canonical=canonical))
+
+
+def main():
+    import argparse
+
+    parser = argparse.ArgumentParser(
+        description='Convert 7-series bit file to FASM.')
+
+    database_dir = os.getenv("XRAY_DATABASE_DIR")
+    database = os.getenv("XRAY_DATABASE")
+    db_root_kwargs = {}
+    if database_dir is None or database is None:
+        db_root_kwargs['required'] = True
+    else:
+        db_root_kwargs['required'] = False
+        db_root_kwargs['default'] = os.path.join(database_dir, database)
+
+    default_part = os.getenv("XRAY_PART")
+    part_kwargs = {}
+    if default_part is None:
+        part_kwargs['required'] = True
+    else:
+        part_kwargs['required'] = False
+        part_kwargs['default'] = default_part
+
+    if os.getenv("XRAY_TOOLS_DIR") is None:
+        default_bitread = 'bitread'
+    else:
+        default_bitread = os.path.join(os.getenv("XRAY_TOOLS_DIR"), 'bitread')
+
+    parser.add_argument('--db-root', help="Database root.", **db_root_kwargs)
+    parser.add_argument('--part', help="Name of part being targetted.", **part_kwargs)
+    parser.add_argument('--bitread', help="Name of part being targetted.", default=default_bitread)
+    parser.add_argument('--frame_range', help="Frame range to use with bitread.")
+    parser.add_argument('bit_file', help='')
+    parser.add_argument(
+        '--verbose',
+        help='Print lines for unknown tiles and bits',
+        action='store_true')
+    parser.add_argument(
+        '--canonical', help='Output canonical bitstream.', action='store_true')
+    args = parser.parse_args()
+
+    with tempfile.NamedTemporaryFile() as bits_file:
+        bit_to_bits(
+                bitread=args.bitread,
+                part_yaml=os.path.join(args.db_root, '{}.yaml'.format(args.part)),
+                bit_file=args.bit_file,
+                bits_file=bits_file.name,
+                frame_range=args.frame_range,
+                )
+
+        bits_to_fasm(args.db_root, bits_file.name, args.verbose, args.canonical)
+
+
+if __name__ == '__main__':
+    main()