diff --git a/.pre-commit.sh b/.pre-commit.sh
new file mode 100755
index 0000000..430220a
--- /dev/null
+++ b/.pre-commit.sh
@@ -0,0 +1,113 @@
+#!/usr/bin/env bash
+# pre-commit hook for degette project.
+#
+# Run formatters first, then checkers.
+# Formatters which changed a file must set the flag 'formatter_updated'.
+
+exit_code=0
+formatter_updated=0
+checker_dirty=0
+
+printf "Stash all unstaged changes.\n"
+git stash save --keep-index &> /dev/null
+STAGED_PYTHON_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep ".py$")
+
+# Formatter: black
+
+printf "> black ... "
+
+if type black &>/dev/null; then
+    if [ -z "$STAGED_PYTHON_FILES" ]; then
+        printf "OK\n"
+    else
+        BLACK_OUTPUT="/tmp/gc-black-output.log"
+        touch $BLACK_OUTPUT
+
+        if ! echo "$STAGED_PYTHON_FILES" | xargs -d'\n' black --check &>$BLACK_OUTPUT; then
+            echo "$STAGED_PYTHON_FILES" | xargs -d'\n' black &>$BLACK_OUTPUT
+            tail -1 $BLACK_OUTPUT
+            formatter_updated=1
+        else
+            printf "OK\n"
+        fi
+    fi
+else
+    printf "SKIP: program not found\n"
+    printf "HINT: Install black with 'pip3 install black' (black requires Python>=3.6)\n"
+fi
+
+# Formatter: isort
+
+printf "> isort ... "
+
+if type isort &>/dev/null; then
+    if [ -z "$STAGED_PYTHON_FILES" ]; then
+        printf "OK\n"
+    else
+        ISORT_OUTPUT="/tmp/gc-isort-output.log"
+        touch $ISORT_OUTPUT
+
+        if ! echo "$STAGED_PYTHON_FILES" | xargs -d'\n' isort --check-only &>$ISORT_OUTPUT; then
+            echo "$STAGED_PYTHON_FILES" | xargs -d'\n' isort &>$ISORT_OUTPUT
+            printf "Reformatted.\n"
+            formatter_updated=1
+        else
+            printf "OK\n"
+        fi
+    fi
+else
+    printf "SKIP: program not found\n"
+    printf "HINT: Install isort with 'pip install isort'\n"
+fi
+
+# Checker: flake8
+
+printf "> flake8 ... "
+
+if type flake8 &>/dev/null; then
+    if [ -z "$STAGED_PYTHON_FILES" ]; then
+        printf "OK\n"
+    else
+        FLAKE8_OUTPUT="/tmp/gc-flake8-output.log"
+        touch $FLAKE8_OUTPUT
+
+        # fix black incompatibility, sometimes flake8 is not PEP8-compliant
+        if ! echo "$STAGED_PYTHON_FILES" | xargs -d'\n' flake8 --ignore=E203,W503 &>$FLAKE8_OUTPUT; then
+            printf "FAIL\n"
+            cat $FLAKE8_OUTPUT
+            checker_dirty=1
+        else
+            printf "OK\n"
+        fi
+    fi
+else
+    printf "SKIP: program not found\n"
+    printf "HINT: Install flake8 with 'pip install flake8'\n"
+fi
+
+# End
+
+if [ $checker_dirty -ne 0 ]
+then
+    printf ">>> Checker(s) detect(s) issue(s)\n"
+    printf "    You can still commit and push :)\n"
+    printf "    Be warned that our CI may cause you more trouble.\n"
+fi
+
+# In some cases, black makes some changes that are reverted by isort:
+# the second condition checks whether some changes have been made at the end of the day.
+# Indeed, when this case applies, one cannot commit using this hook.
+if [ $formatter_updated -ne 0 ]
+then
+    printf ">>> Working tree updated by formatter(s)\n"
+    printf "    Add changes to staging area and retry.\n"
+    exit_code=1
+fi
+
+printf "\n"
+
+printf "Unstash all unstaged changes.\n"
+git stash pop &> /dev/null
+
+exit $exit_code
+
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4bffbf0..a6cb3e1 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,6 @@
 -r requirements.txt
 django-debug-toolbar
 ipython
-black
\ No newline at end of file
+black
+isort
+flake8