diff --git a/.clang-format b/.clang-format
new file mode 100644
index 00000000..ec53b72b
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,7 @@
+---
+BasedOnStyle: Google
+IndentWidth: 2
+---
+Language: Cpp
+ColumnLimit: 100
+---
diff --git a/README.md b/README.md
index 0facfc9a..73339ff6 100644
--- a/README.md
+++ b/README.md
@@ -107,6 +107,12 @@ cmake --build . -- fsfw-tests_coverage -j
 
 The `coverage.py` script located in the `script` folder can also be used to do this conveniently.
 
+## Formatting the sources
+
+The formatting is done by the `clang-format` tool. The configuration is contained within the
+`.clang-format` file in the repository root. As long as `clang-format` is installed, you
+can run the `apply-clang-format.sh` helper script to format all source files consistently.
+
 ## Index
 
 [1. High-level overview](docs/README-highlevel.md#top) <br>
diff --git a/scripts/apply-clang-format.sh b/scripts/apply-clang-format.sh
new file mode 100755
index 00000000..27202324
--- /dev/null
+++ b/scripts/apply-clang-format.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+if [[ ! -f README.md ]]; then
+	cd ..
+fi
+
+find ./src -iname *.h -o -iname *.cpp -o -iname *.c | xargs clang-format --style=file -i
+find ./hal -iname *.h -o -iname *.cpp -o -iname *.c | xargs clang-format --style=file -i
+find ./tests -iname *.h -o -iname *.cpp -o -iname *.c | xargs clang-format --style=file -i