diff --git a/create-badge.sh b/create-badge.sh
index bee0df0..286d117 100755
--- a/create-badge.sh
+++ b/create-badge.sh
@@ -1,13 +1,19 @@
 #!/bin/bash
-#set -x
+set -euo pipefail
 
 number="$1"
 name="$2"
 pseudo="$3"
 key="$4"
 
-recto_out=recto-out.jpeg
-verso_out=verso-out.jpeg
+unset tmpdir
+cleanup () {
+  if [ -n "$tmpdir" ] && [ -d "$tmpdir" ]; then
+    rm -fr "$tmpdir"
+  fi
+}
+trap cleanup EXIT
+tmpdir=$(mktemp -d)
 
 text_to_image () {
   text="$1"
@@ -29,20 +35,39 @@ text_to_qrcode () {
   convert "$output" -resize "$width"x "$output"
 }
 
+viewjpeg="$(ls /usr/share/ghostscript/*/lib/viewjpeg.ps | tail -1)"
+convert_jpeg_to_pdf () {
+  declare -a jpeg_stanza
+  while [ $# -gt 1 ]; do
+    jpeg_stanza+=( "($1) viewJPEG showpage" )
+    shift
+  done
+  gs \
+   -dNOSAFER \
+   -sDEVICE=pdfwrite \
+   -o "$1" \
+   -g1051x678 \
+    $viewjpeg \
+   -c "${jpeg_stanza[*]}"
+}
+
 # 1. name -> image
-text_to_image "$number" 42 470 number.jpeg
-text_to_image "$name" 42 470 name.jpeg
-text_to_image "$pseudo" 42 470 pseudo.jpeg
-text_to_image "$key" 36 950 key.jpeg
-text_to_qrcode "$key" 276 qrcode.png
+text_to_image "$number" 42 470 "$tmpdir"/number.jpeg
+text_to_image "$name" 42 470 "$tmpdir"/name.jpeg
+text_to_image "$pseudo" 42 470 "$tmpdir"/pseudo.jpeg
+text_to_image "$key" 36 950 "$tmpdir"/key.jpeg
+text_to_qrcode "$key" 276 "$tmpdir"/qrcode.png
 
 convert verso.jpeg \
-  number.jpeg -geometry +535+96 -composite \
-  name.jpeg -geometry +535+260 -composite \
-  pseudo.jpeg -geometry +535+413 -composite \
-  key.jpeg -geometry +47+577 -composite \
-  $verso_out
+  "$tmpdir"/number.jpeg -geometry +535+96 -composite \
+  "$tmpdir"/name.jpeg -geometry +535+260 -composite \
+  "$tmpdir"/pseudo.jpeg -geometry +535+413 -composite \
+  "$tmpdir"/key.jpeg -geometry +47+577 -composite \
+  "$tmpdir"/verso.jpeg
 
 convert recto.jpeg \
-  qrcode.png -geometry +693+339 -composite \
-  $recto_out
+  "$tmpdir"/qrcode.png -geometry +693+339 -composite \
+  "$tmpdir"/recto.jpeg
+
+[ -d badges ] || mkdir badges
+convert_jpeg_to_pdf "$tmpdir"/recto.jpeg "$tmpdir"/verso.jpeg badges/"${number//\//_}".pdf
diff --git a/generate-all-badges-from-member-list.sh b/generate-all-badges-from-member-list.sh
index d19f07c..841e1ef 100755
--- a/generate-all-badges-from-member-list.sh
+++ b/generate-all-badges-from-member-list.sh
@@ -7,24 +7,6 @@ normalize_name () {
   echo $* | sed -e 's/[^ -]\+/\L\u&/g' -e 's/ De / de /g'
 }
 
-viewjpeg="$(ls /usr/share/ghostscript/*/lib/viewjpeg.ps | tail -1)"
-convert_jpeg_to_pdf () {
-  declare -a jpeg_stanza
-  while [ $# -gt 1 ]; do
-    jpeg_stanza+=( "($1) viewJPEG showpage" )
-    shift
-  done
-  gs \
-   -dNOSAFER \
-   -sDEVICE=pdfwrite \
-   -o "$1" \
-   -g1051x678 \
-    $viewjpeg \
-   -c "${jpeg_stanza[*]}"
-}
-
-mkdir -p badges
-
 while read line; do
   eval member=( $line )
   if [ "${member[0]}" = "Clef AXIOM" ]; then
@@ -37,5 +19,4 @@ while read line; do
   key="${member[4]}"
 
   ./create-badge.sh "$number" "$lastname $firstname" "$nickname" "$key"
-  convert_jpeg_to_pdf recto-out.jpeg verso-out.jpeg badges/"${number//\//_}.pdf"
 done < <(xlsx2csv -q all -d ' ' "$spreadsheet" | tail +3)