diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..57d8b28
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,19 @@
+repos:
+
+- repo: local
+  hooks:
+    - id: black
+      name: Black
+      entry: pipenv run black .
+      language: system
+      types: [python]
+    - id: isort
+      name: Isort
+      entry: pipenv run isort .
+      language: system
+      types: [python]
+    - id: flake8
+      name: Flake8
+      entry: pipenv run flake8
+      language: system
+      types: [python]
diff --git a/Pipfile b/Pipfile
index c9226bf..7f11dbb 100644
--- a/Pipfile
+++ b/Pipfile
@@ -4,6 +4,9 @@ url = "https://pypi.org/simple"
 verify_ssl = true
 
 [dev-packages]
+black = "==19.10b0"
+flake8 = "*"
+isort = "*"
 
 [packages]
 "aiohttp[speedups]" = "*"
diff --git a/Pipfile.lock b/Pipfile.lock
index 4646e67..15d206c 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "7b825fb912f146be25a07d567bbbc1ee777bb195bc9e3aa133eea3ecab6b514c"
+            "sha256": "e8d9cf2575f4107264ed9656f494c994de0b34618bdbbea507d6bbd11f7c260c"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -316,5 +316,158 @@
             "version": "==1.5.1"
         }
     },
-    "develop": {}
+    "develop": {
+        "appdirs": {
+            "hashes": [
+                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
+                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
+            ],
+            "version": "==1.4.4"
+        },
+        "attrs": {
+            "hashes": [
+                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
+                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==19.3.0"
+        },
+        "black": {
+            "hashes": [
+                "sha256:1b30e59be925fafc1ee4565e5e08abef6b03fe455102883820fe5ee2e4734e0b",
+                "sha256:c2edb73a08e9e0e6f65a0e6af18b059b8b1cdd5bef997d7a0b181df93dc81539"
+            ],
+            "index": "pypi",
+            "version": "==19.10b0"
+        },
+        "click": {
+            "hashes": [
+                "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a",
+                "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==7.1.2"
+        },
+        "flake8": {
+            "hashes": [
+                "sha256:15e351d19611c887e482fb960eae4d44845013cc142d42896e9862f775d8cf5c",
+                "sha256:f04b9fcbac03b0a3e58c0ab3a0ecc462e023a9faf046d57794184028123aa208"
+            ],
+            "index": "pypi",
+            "version": "==3.8.3"
+        },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:90bb658cdbbf6d1735b6341ce708fc7024a3e14e99ffdc5783edea9f9b077f83",
+                "sha256:dc15b2969b4ce36305c51eebe62d418ac7791e9a157911d58bfb1f9ccd8e2070"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==1.7.0"
+        },
+        "isort": {
+            "hashes": [
+                "sha256:723de131d9ae9d2561844f0ee525ce33a396a11bcda57174f036ed5ab3d6a122",
+                "sha256:cdca22530d093ed16983ba52c41560fa0219d1b958e44fd2ae2995dcc7b785be"
+            ],
+            "index": "pypi",
+            "version": "==5.3.0"
+        },
+        "mccabe": {
+            "hashes": [
+                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
+                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
+            ],
+            "version": "==0.6.1"
+        },
+        "pathspec": {
+            "hashes": [
+                "sha256:7d91249d21749788d07a2d0f94147accd8f845507400749ea19c1ec9054a12b0",
+                "sha256:da45173eb3a6f2a5a487efba21f050af2b41948be6ab52b6a1e3ff22bb8b7061"
+            ],
+            "version": "==0.8.0"
+        },
+        "pycodestyle": {
+            "hashes": [
+                "sha256:2295e7b2f6b5bd100585ebcb1f616591b652db8a741695b3d8f5d28bdc934367",
+                "sha256:c58a7d2815e0e8d7972bf1803331fb0152f867bd89adf8a01dfd55085434192e"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.6.0"
+        },
+        "pyflakes": {
+            "hashes": [
+                "sha256:0d94e0e05a19e57a99444b6ddcf9a6eb2e5c68d3ca1e98e90707af8152c90a92",
+                "sha256:35b2d75ee967ea93b55750aa9edbbf72813e06a66ba54438df2cfac9e3c27fc8"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==2.2.0"
+        },
+        "regex": {
+            "hashes": [
+                "sha256:0dc64ee3f33cd7899f79a8d788abfbec168410be356ed9bd30bbd3f0a23a7204",
+                "sha256:1269fef3167bb52631ad4fa7dd27bf635d5a0790b8e6222065d42e91bede4162",
+                "sha256:14a53646369157baa0499513f96091eb70382eb50b2c82393d17d7ec81b7b85f",
+                "sha256:3a3af27a8d23143c49a3420efe5b3f8cf1a48c6fc8bc6856b03f638abc1833bb",
+                "sha256:46bac5ca10fb748d6c55843a931855e2727a7a22584f302dd9bb1506e69f83f6",
+                "sha256:4c037fd14c5f4e308b8370b447b469ca10e69427966527edcab07f52d88388f7",
+                "sha256:51178c738d559a2d1071ce0b0f56e57eb315bcf8f7d4cf127674b533e3101f88",
+                "sha256:5ea81ea3dbd6767873c611687141ec7b06ed8bab43f68fad5b7be184a920dc99",
+                "sha256:6961548bba529cac7c07af2fd4d527c5b91bb8fe18995fed6044ac22b3d14644",
+                "sha256:75aaa27aa521a182824d89e5ab0a1d16ca207318a6b65042b046053cfc8ed07a",
+                "sha256:7a2dd66d2d4df34fa82c9dc85657c5e019b87932019947faece7983f2089a840",
+                "sha256:8a51f2c6d1f884e98846a0a9021ff6861bdb98457879f412fdc2b42d14494067",
+                "sha256:9c568495e35599625f7b999774e29e8d6b01a6fb684d77dee1f56d41b11b40cd",
+                "sha256:9eddaafb3c48e0900690c1727fba226c4804b8e6127ea409689c3bb492d06de4",
+                "sha256:bbb332d45b32df41200380fff14712cb6093b61bd142272a10b16778c418e98e",
+                "sha256:bc3d98f621898b4a9bc7fecc00513eec8f40b5b83913d74ccb445f037d58cd89",
+                "sha256:c11d6033115dc4887c456565303f540c44197f4fc1a2bfb192224a301534888e",
+                "sha256:c50a724d136ec10d920661f1442e4a8b010a4fe5aebd65e0c2241ea41dbe93dc",
+                "sha256:d0a5095d52b90ff38592bbdc2644f17c6d495762edf47d876049cfd2968fbccf",
+                "sha256:d6cff2276e502b86a25fd10c2a96973fdb45c7a977dca2138d661417f3728341",
+                "sha256:e46d13f38cfcbb79bfdb2964b0fe12561fe633caf964a77a5f8d4e45fe5d2ef7"
+            ],
+            "version": "==2020.7.14"
+        },
+        "toml": {
+            "hashes": [
+                "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f",
+                "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"
+            ],
+            "version": "==0.10.1"
+        },
+        "typed-ast": {
+            "hashes": [
+                "sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355",
+                "sha256:0c2c07682d61a629b68433afb159376e24e5b2fd4641d35424e462169c0a7919",
+                "sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa",
+                "sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652",
+                "sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75",
+                "sha256:4083861b0aa07990b619bd7ddc365eb7fa4b817e99cf5f8d9cf21a42780f6e01",
+                "sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d",
+                "sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1",
+                "sha256:6daac9731f172c2a22ade6ed0c00197ee7cc1221aa84cfdf9c31defeb059a907",
+                "sha256:715ff2f2df46121071622063fc7543d9b1fd19ebfc4f5c8895af64a77a8c852c",
+                "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3",
+                "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b",
+                "sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614",
+                "sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb",
+                "sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b",
+                "sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41",
+                "sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6",
+                "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34",
+                "sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe",
+                "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4",
+                "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"
+            ],
+            "version": "==1.4.1"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b",
+                "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==3.1.0"
+        }
+    }
 }
diff --git a/app.py b/app.py
index 113e7a7..ed59e7e 100644
--- a/app.py
+++ b/app.py
@@ -1,13 +1,13 @@
-import asyncio
 import io
 from urllib.parse import parse_qsl, urlparse
 
 import aiohttp
 from aiohttp import web
 from PIL import Image
-from validation import schema
 from voluptuous import MultipleInvalid
 
+from validation import schema
+
 
 def main(host, port):
     app = web.Application()
@@ -69,5 +69,5 @@ async def stream_from_image(img, request):
 HOST = "0.0.0.0"
 PORT = 8000
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main(HOST, PORT)
diff --git a/validation.py b/validation.py
index 51e5489..e610e7f 100644
--- a/validation.py
+++ b/validation.py
@@ -2,20 +2,14 @@
 
 from voluptuous import Invalid, Schema
 
-resize_validator = re.compile(r'^([1-9]\d*)x([1-9]\d*)$')
+resize_validator = re.compile(r"^([1-9]\d*)x([1-9]\d*)$")
 
 
 def is_resize(s):
     result = resize_validator.match(s)
     if result is None:
-        raise Invalid('Invalid resize')
+        raise Invalid("Invalid resize")
     return [int(size) for size in result.groups()]
 
 
-schema = Schema(
-    {
-        'source': str,
-        'resize': is_resize,
-    },
-    required=True
-)
+schema = Schema({"source": str, "resize": is_resize}, required=True)