diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
index 69e33b978d..3bd80e6084 100644
--- a/.config/dotnet-tools.json
+++ b/.config/dotnet-tools.json
@@ -9,7 +9,7 @@
       ]
     },
     "regitlint": {
-      "version": "6.0.8",
+      "version": "6.1.1",
       "commands": [
         "regitlint"
       ]
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 5e87f135f0..4205b1ceec 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -58,8 +58,8 @@ Please follow these steps to have your contribution considered by the maintainer
 
 We use [CSharpGuidelines](https://csharpcodingguidelines.com/) as our coding standard (with a few minor exceptions). Coding style is validated during PR build, where we inject an extra settings layer that promotes various suggestions to warning level. This ensures a high-quality codebase without interfering too much when editing code.
 You can run the following [PowerShell scripts](https://github.com/PowerShell/PowerShell/releases) locally:
-- `pwsh inspectcode.ps1`: Scans the code for style violations and opens the result in your web browser.
-- `pwsh cleanupcode.ps1`: Reformats the entire codebase to match with our configured style.
+- `pwsh ./inspectcode.ps1`: Scans the code for style violations and opens the result in your web browser.
+- `pwsh ./cleanupcode.ps1 [branch-name-or-commit-hash]`: Reformats the codebase to match with our configured style, optionally only changed files since the specified branch (usually master).
 
 Code inspection violations can be addressed in several ways, depending on the situation:
 - Types that are reported to be never instantiated (because the IoC container creates them dynamically) should be decorated with `[UsedImplicitly(ImplicitUseKindFlags.InstantiatedNoFixedConstructorSignature)]`.
diff --git a/Build.ps1 b/Build.ps1
index e2e638fafa..4a92feed89 100644
--- a/Build.ps1
+++ b/Build.ps1
@@ -40,16 +40,21 @@ function RunCleanupCode {
     # When running in cibuild for a pull request, this reformats only the files changed in the PR and fails if the reformat produces changes.
 
     if ($env:APPVEYOR_PULL_REQUEST_HEAD_COMMIT) {
-        Write-Output "Running code cleanup on changed files in pull request"
-
         # In the past, we used $env:APPVEYOR_PULL_REQUEST_HEAD_COMMIT for the merge commit hash. That is the pinned hash at the time the build is enqueued.
         # When a force-push happens after that, while the build hasn't yet started, this hash becomes invalid during the build, resulting in a lookup error.
-        # To prevent failing the build for unobvious reasons we use HEAD, which is always the latest version.
-        $mergeCommitHash = git rev-parse "HEAD"
-        $targetCommitHash = git rev-parse "$env:APPVEYOR_REPO_BRANCH"
+        # To prevent failing the build for unobvious reasons we use HEAD, which is always a detached head (the PR merge result).
+
+        $headCommitHash = git rev-parse HEAD
+        CheckLastExitCode
 
-        dotnet regitlint -s JsonApiDotNetCore.sln --print-command --disable-jb-path-hack --jb --profile='\"JADNC Full Cleanup\"' --jb --properties:Configuration=Release --jb --verbosity=WARN -f commits -a $mergeCommitHash -b $targetCommitHash --fail-on-diff --print-diff
+        $baseCommitHash = git rev-parse "$env:APPVEYOR_REPO_BRANCH"
         CheckLastExitCode
+
+        if ($baseCommitHash -ne $headCommitHash) {
+            Write-Output "Running code cleanup on commit range $baseCommitHash..$headCommitHash in pull request."
+            dotnet regitlint -s JsonApiDotNetCore.sln --print-command --skip-tool-check --jb-profile="JADNC Full Cleanup" --jb --properties:Configuration=Release --jb --verbosity=WARN -f commits -a $headCommitHash -b $baseCommitHash --fail-on-diff --print-diff
+            CheckLastExitCode
+        }
     }
 }
 
diff --git a/cleanupcode.ps1 b/cleanupcode.ps1
index 6db01a863a..bab8b82af1 100644
--- a/cleanupcode.ps1
+++ b/cleanupcode.ps1
@@ -1,17 +1,44 @@
 #Requires -Version 7.0
 
-# This script reformats the entire codebase to make it compliant with our coding guidelines.
+# This script reformats (part of) the codebase to make it compliant with our coding guidelines.
 
-dotnet tool restore
+param(
+    # Git branch name or base commit hash to reformat only the subset of changed files. Omit for all files.
+    [string] $revision
+)
 
-if ($LASTEXITCODE -ne 0) {
-    throw "Tool restore failed with exit code $LASTEXITCODE"
+function VerifySuccessExitCode {
+    if ($LastExitCode -ne 0) {
+        throw "Command failed with exit code $LastExitCode."
+    }
 }
 
+dotnet tool restore
+VerifySuccessExitCode
+
 dotnet restore
+VerifySuccessExitCode
 
-if ($LASTEXITCODE -ne 0) {
-    throw "Package restore failed with exit code $LASTEXITCODE"
-}
+if ($revision) {
+    $headCommitHash = git rev-parse HEAD
+    VerifySuccessExitCode
 
-dotnet regitlint -s JsonApiDotNetCore.sln --print-command --disable-jb-path-hack --jb --profile='\"JADNC Full Cleanup\"' --jb --properties:Configuration=Release --jb --verbosity=WARN
+    $baseCommitHash = git rev-parse $revision
+    VerifySuccessExitCode
+
+    if ($baseCommitHash -eq $headCommitHash) {
+        Write-Output "Running code cleanup on staged/unstaged files."
+        dotnet regitlint -s JsonApiDotNetCore.sln --print-command --skip-tool-check --jb-profile="JADNC Full Cleanup" --jb --properties:Configuration=Release --jb --verbosity=WARN -f staged,modified
+        VerifySuccessExitCode
+    }
+    else {
+        Write-Output "Running code cleanup on commit range $baseCommitHash..$headCommitHash, including staged/unstaged files."
+        dotnet regitlint -s JsonApiDotNetCore.sln --print-command --skip-tool-check --jb-profile="JADNC Full Cleanup" --jb --properties:Configuration=Release --jb --verbosity=WARN -f staged,modified,commits -a $headCommitHash -b $baseCommitHash
+        VerifySuccessExitCode
+    }
+}
+else {
+    Write-Output "Running code cleanup on all files."
+    dotnet regitlint -s JsonApiDotNetCore.sln --print-command --skip-tool-check --jb-profile="JADNC Full Cleanup" --jb --properties:Configuration=Release --jb --verbosity=WARN
+    VerifySuccessExitCode
+}