diff --git a/README.md b/README.md
index 259d5bb..ebf10b4 100644
--- a/README.md
+++ b/README.md
@@ -27,9 +27,10 @@ With [Homebrew](https://brew.sh) you can install the same dependencies:
 brew install jq qrencode imagemagick poppler node coreutils
 ```
 
-These scripts rely on the GNU implementation of `mktemp` (`gmktemp`) found in
-`coreutils`. If you prefer not to install `coreutils`, edit the scripts to use
-`mktemp` without the `--suffix` option.
+The obfuscation scripts attempt to use `mktemp --suffix` when creating
+temporary files. If that option is unavailable – for example on macOS without
+GNU `coreutils` – the scripts automatically fall back to a portable `mktemp`
+command that yields the same result.
 
 The obfuscation scripts also rely on a pair of Node modules. Install them
 globally:
diff --git a/src/obfuscate_index.sh b/src/obfuscate_index.sh
index ea6ba25..d6244bb 100755
--- a/src/obfuscate_index.sh
+++ b/src/obfuscate_index.sh
@@ -15,11 +15,20 @@ for cmd in javascript-obfuscator html-minifier-terser node; do
   require_cmd "$cmd"
 done
 
+# Detect whether mktemp supports the --suffix option. If not, fall back to a
+# portable template-based approach (e.g., on macOS).
+if tmp=$(mktemp --suffix=.test 2>/dev/null); then
+  rm -f "$tmp"
+  mktemp_with_suffix() { mktemp --suffix="$1"; }
+else
+  mktemp_with_suffix() { mktemp "${TMPDIR:-/tmp}/tmp.XXXXXX$1"; }
+fi
+
 # Input and output file names
 input_file="index-master.html"
 output_file="index.html"
-temp_js_file=$(mktemp --suffix=.js)  # Temporary .js file for extracting JavaScript
-temp_js_obfuscated_file=$(mktemp --suffix=.js)  # Temporary file for obfuscated JavaScript
+temp_js_file=$(mktemp_with_suffix .js)  # Temporary .js file for extracting JavaScript
+temp_js_obfuscated_file=$(mktemp_with_suffix .js)  # Temporary file for obfuscated JavaScript
 temp_html_file=$(mktemp)  # Temporary file for processing HTML without JS
 
 # Check if the input file exists
diff --git a/src/obfuscate_nostr.sh b/src/obfuscate_nostr.sh
index 271ea60..16b3ef6 100755
--- a/src/obfuscate_nostr.sh
+++ b/src/obfuscate_nostr.sh
@@ -15,11 +15,20 @@ for cmd in javascript-obfuscator html-minifier-terser node; do
   require_cmd "$cmd"
 done
 
+# Detect whether mktemp supports the --suffix option. If not, fall back to a
+# portable template-based approach (e.g., on macOS).
+if tmp=$(mktemp --suffix=.test 2>/dev/null); then
+  rm -f "$tmp"
+  mktemp_with_suffix() { mktemp --suffix="$1"; }
+else
+  mktemp_with_suffix() { mktemp "${TMPDIR:-/tmp}/tmp.XXXXXX$1"; }
+fi
+
 # Input and output file names
 input_file="nostr-master.html"
 output_file="nostr.html"
-temp_js_file=$(mktemp --suffix=.js)  # Temporary .js file for extracting JavaScript
-temp_js_obfuscated_file=$(mktemp --suffix=.js)  # Temporary file for obfuscated JavaScript
+temp_js_file=$(mktemp_with_suffix .js)  # Temporary .js file for extracting JavaScript
+temp_js_obfuscated_file=$(mktemp_with_suffix .js)  # Temporary file for obfuscated JavaScript
 temp_html_file=$(mktemp)  # Temporary file for processing HTML without JS
 
 # Check if the input file exists