diff --git a/tools/coins_gen b/tools/codegen/gen_coins.py
similarity index 88%
rename from tools/coins_gen
rename to tools/codegen/gen_coins.py
index 6b45d4c3..ebfe6c2c 100755
--- a/tools/coins_gen
+++ b/tools/codegen/gen_coins.py
@@ -14,7 +14,7 @@ fields = [
     'segwit',
 ]
 
-coins = json.load(open('../../trezor-common/coins.json', 'r'))
+coins = json.load(open('../../../trezor-common/coins.json', 'r'))
 
 print('COINS = [')
 for c in coins:
diff --git a/tools/ttf2c b/tools/codegen/gen_font.py
similarity index 97%
rename from tools/ttf2c
rename to tools/codegen/gen_font.py
index 09956ce9..a4987929 100755
--- a/tools/ttf2c
+++ b/tools/codegen/gen_font.py
@@ -1,4 +1,8 @@
 #!/usr/bin/env python3
+
+# script used to generate /embed/extmod/modtrezorui/font_*_*.c
+
+
 import freetype
 
 MIN_GLYPH = ord(' ')
diff --git a/tools/genkeys.py b/tools/codegen/gen_keys.py
similarity index 99%
rename from tools/genkeys.py
rename to tools/codegen/gen_keys.py
index 32a1c92d..fbb1c0c0 100755
--- a/tools/genkeys.py
+++ b/tools/codegen/gen_keys.py
@@ -3,9 +3,11 @@
 import binascii
 import ed25519raw
 
+
 def hex_to_c(s):
     return '"\\x' + '\\x'.join([s[i:i + 2] for i in range(0, len(s), 2)]) + '"'
 
+
 for c in 'ABCDEFGHI':
     print()
     seckey = c.encode() * 32
diff --git a/embed/extmod/modtrezorui/loader_gen.py b/tools/codegen/gen_loader.py
similarity index 92%
rename from embed/extmod/modtrezorui/loader_gen.py
rename to tools/codegen/gen_loader.py
index d41a9a1f..3da60a5b 100755
--- a/embed/extmod/modtrezorui/loader_gen.py
+++ b/tools/codegen/gen_loader.py
@@ -1,4 +1,7 @@
 #!/usr/bin/python3
+
+# script used to generate /embed/extmod/modtrezorui/loader.h
+
 import math
 import sys
 
@@ -15,7 +18,7 @@ with open('loader.h', 'wt') as f:
             c = {}
             for i in [5, 15]:
                 if (inner - 0.5 <= d) and (d <= inner + 0.5):
-                    c[i] = 15 * (d - inner + 0.5);
+                    c[i] = 15 * (d - inner + 0.5)
                 elif (inner + 0.5 <= d) and (d <= inner + 1.5):
                     c[i] = 15
                 elif (inner + 1.5 <= d) and (d <= inner + 2.5):