diff --git a/tools/rng_entropy_collector.py b/tools/rng_entropy_collector.py
new file mode 100755
index 0000000000..889146738f
--- /dev/null
+++ b/tools/rng_entropy_collector.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+# example usage: ./rng_entropy_collector.py stm32_rng_1.dat 1048576
+# note: for reading large amounts of entropy, compile a firmware
+# that has DEBUG_RNG == 1 as that will disable the user button
+# push confirmation
+
+from __future__ import print_function
+import binascii
+import io
+import sys
+from trezorlib.client import TrezorClient
+from trezorlib.transport_hid import HidTransport
+
+def get_client():
+    devices = HidTransport.enumerate()   # List all connected TREZORs on USB
+    if len(devices) == 0:                # Check whether we found any
+        return None
+    transport = HidTransport(devices[0]) # Use first connected device
+    return TrezorClient(transport)       # Creates object for communicating with TREZOR
+
+def main():
+    client = get_client()
+    if not client:
+        print('No TREZOR connected')
+        return
+
+    arg1 = sys.argv[1] # output file
+    arg2 = int(sys.argv[2], 10) # total number of how many bytes of entropy to read
+    step = 1024 if arg2 >= 1024 else arg2 # trezor will only return 1KB at a time
+
+    with io.open(arg1, 'wb') as f:
+        for i in xrange(0, arg2, step):
+            entropy = client.get_entropy(step)
+            f.write(entropy)
+
+    client.close()
+
+if __name__ == '__main__':
+    main()