diff --git a/.clang-format b/.clang-format
new file mode 100644
index 00000000..8ce06de2
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,93 @@
+---
+Language:        Cpp
+
+ColumnLimit:     80                   # line width, 0: respect programmer's choice
+TabWidth:        8
+UseTab:          Never
+
+AccessModifierOffset: -2
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: true
+AlignOperands:   true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: true
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: true
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass:      false
+  AfterControlStatement: false
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterNamespace:  true
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  BeforeCatch:     false
+  BeforeElse:      false
+  IndentBraces:    false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Stroustrup
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: true
+# BreakInheritanceListBeforeComma: true
+
+CommentPragmas:  '^ IWYU pragma:'
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+ForEachMacros:   [ foreach, Q_FOREACH, BOOST_FOREACH ]
+IncludeCategories:
+  - Regex:           '^<.*\.h>'
+    Priority:        1
+  - Regex:           '^<.*'
+    Priority:        2
+  - Regex:           '.*'
+    Priority:        3
+SortIncludes:    false
+IndentCaseLabels: true
+IndentWidth:     2
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: All
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: false
+PenaltyBreakBeforeFirstCallParameter: 1
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 200
+PointerAlignment: Left
+ReflowComments:  true
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Auto
+
+# If true, always break after the template<...> of a template declaration.
+AlwaysBreakTemplateDeclarations: true
diff --git a/.github/workflows/build-ci.yml b/.github/workflows/build-ci.yml
index bcc44164..f496ccf7 100644
--- a/.github/workflows/build-ci.yml
+++ b/.github/workflows/build-ci.yml
@@ -3,6 +3,20 @@ name: tests
 on: [push, pull_request, workflow_dispatch]
 
 jobs:
+
+  code_format:
+    name: "Check code formatting"
+    runs-on: ubuntu-22.04
+    steps:
+
+    - name: Checkout Eisvogel repository
+      uses: actions/checkout@v4
+
+    - name: Run clang-format
+      run: |
+        echo "Running `clang-format --version`"
+        find . -iname '*.hxx' -o -iname '*.hh' -o -iname '*.cpp' -o -iname '*.h' | xargs clang-format --dry-run --Werror --style=file
+
   build_and_test:
     name: "Run build and tests"
     runs-on: ubuntu-22.04