diff --git a/.gitlab/merge_request_templates/Bug.md b/.gitlab/merge_request_templates/Bug.md
index f249e2f85..76e5174b0 100644
--- a/.gitlab/merge_request_templates/Bug.md
+++ b/.gitlab/merge_request_templates/Bug.md
@@ -5,4 +5,5 @@ Closes #number
 ## Merge Request Checklist
 
 * [ ] Style Guide
-* [ ] Maximum of 10 compile warnings via *./tools/test_max_warnings.sh*
\ No newline at end of file
+* [ ] Maximum of 10 compile warnings via *./tools/test_max_warnings.sh*
+* [ ] No large files via *./tools/test_max_file_size.sh*. What is the largest file?
diff --git a/.gitlab/merge_request_templates/Feature.md b/.gitlab/merge_request_templates/Feature.md
index 6cb9e833c..052bec19c 100644
--- a/.gitlab/merge_request_templates/Feature.md
+++ b/.gitlab/merge_request_templates/Feature.md
@@ -6,6 +6,7 @@ Closes #number
 
 * [ ] Style Guide
 * [ ] Maximum of 10 compile warnings via *./tools/test_max_warnings.sh*. How many warning were found?
+* [ ] No large files via *./tools/test_max_file_size.sh*. What is the largest file?
 * [ ] Descriptions for new/changed routines
   * [ ] Short header description (do not just spell out the name of the subroutine, units for important variables if applicable)
   * [ ] Workflow
diff --git a/tools/test_max_file_size.sh b/tools/test_max_file_size.sh
new file mode 100755
index 000000000..f362e62dc
--- /dev/null
+++ b/tools/test_max_file_size.sh
@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Script for checking the file size of every changed/added/removed file compared with master.dev branch
+# Depending on the file size, different colours indicate if the added files are too large
+
+if test -t 1; then # if terminal
+  NbrOfColors=$(which tput > /dev/null && tput colors) # supports color
+  if test -n "$NbrOfColors" && test $NbrOfColors -ge 8; then
+    NC="$(tput sgr0)"
+    RED="$(tput setaf 1)"
+    GREEN="$(tput setaf 2)"
+    YELLOW="$(tput setaf 3)"
+  fi
+fi
+
+# Get all changed files
+CHANGED=$(git diff --name-only master.dev)
+
+# Check if any changes are present
+if [[ -n $CHANGED ]]; then
+  # Sort found files by size (-S) in reverse ordering (-r)
+  SORTED=$(ls -Shsr $CHANGED)
+  # Loop over all changes
+  for file in $SORTED; do
+    # Check if path is a file that exists
+    if [[ -f $file ]]; then
+      # -b, --bytes           equivalent to '--apparent-size --block-size=1'
+      LINE=$(du -h $file)
+      FILESIZE=$(du -b $file | cut -d '	' -f1) # this is a tab, not a white space
+      if [[ $FILESIZE -gt 1000000 ]]; then
+        printf "${RED}$LINE${NC}\n"
+      else
+        if [[ $FILESIZE -gt 100000 ]]; then
+          printf "${YELLOW}$LINE${NC}\n"
+        else
+          printf "${GREEN}$LINE${NC}\n"
+        fi
+      fi
+    fi
+  done
+  echo ""
+  FILESIZE=$(du -h $file | cut -d '	' -f1) # this is a tab, not a white space
+  printf "The largest file is [$FILESIZE]\n"
+else
+  echo "no changes to master.dev found. Exit."
+fi
+
+