diff --git a/configure b/configure
index 0acc129..fabc592 100755
--- a/configure
+++ b/configure
@@ -588,6 +588,9 @@ ac_subst_vars='LTLIBOBJS
 LIBOBJS
 configure_vars
 makefile_include
+sha256sum_bin
+sha1sum_bin
+md5sum_bin
 msgmerge_bin
 msgfmt_bin
 xgettext_bin
@@ -675,7 +678,10 @@ gettext_bin
 gettextsh_bin
 xgettext_bin
 msgfmt_bin
-msgmerge_bin'
+msgmerge_bin
+md5sum_bin
+sha1sum_bin
+sha256sum_bin'
 
 
 # Initialize some variables set by options.
@@ -1320,6 +1326,10 @@ Some influential environment variables:
   msgfmt_bin  path to msgfmt
   msgmerge_bin
               path to msgmerge
+  md5sum_bin  path to md5sum
+  sha1sum_bin path to sha1sum
+  sha256sum_bin
+              path to sha256sum
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -2653,6 +2663,138 @@ test -n "$msgmerge_bin" || as_fn_error $? "no msgmerge (program) found" "$LINENO
 
 
 
+# Extract the first word of "md5sum", so it can be a program name with args.
+set dummy md5sum; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_md5sum_bin+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $md5sum_bin in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_md5sum_bin="$md5sum_bin" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_md5sum_bin="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+md5sum_bin=$ac_cv_path_md5sum_bin
+if test -n "$md5sum_bin"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $md5sum_bin" >&5
+$as_echo "$md5sum_bin" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+test -n "$md5sum_bin" || as_fn_error $? "no md5sum (program) found" "$LINENO" 5
+
+
+
+# Extract the first word of "sha1sum", so it can be a program name with args.
+set dummy sha1sum; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_sha1sum_bin+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $sha1sum_bin in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_sha1sum_bin="$sha1sum_bin" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_sha1sum_bin="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+sha1sum_bin=$ac_cv_path_sha1sum_bin
+if test -n "$sha1sum_bin"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $sha1sum_bin" >&5
+$as_echo "$sha1sum_bin" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+test -n "$sha1sum_bin" || as_fn_error $? "no sha1sum (program) found" "$LINENO" 5
+
+
+
+# Extract the first word of "sha256sum", so it can be a program name with args.
+set dummy sha256sum; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_sha256sum_bin+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $sha256sum_bin in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_sha256sum_bin="$sha256sum_bin" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_sha256sum_bin="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+sha256sum_bin=$ac_cv_path_sha256sum_bin
+if test -n "$sha256sum_bin"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $sha256sum_bin" >&5
+$as_echo "$sha256sum_bin" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+test -n "$sha256sum_bin" || as_fn_error $? "no sha256sum (program) found" "$LINENO" 5
+
+
+
 # Check for Python modules
 
     if test -z $PYTHON;
diff --git a/configure.ac b/configure.ac
index 02c0c62..8baf152 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,6 +44,9 @@ REQUIRE_PROG([gettext.sh],[gettextsh_bin],[gettext for shell])
 REQUIRE_PROG([xgettext],[xgettext_bin],[program])
 REQUIRE_PROG([msgfmt],[msgfmt_bin],[program])
 REQUIRE_PROG([msgmerge],[msgmerge_bin],[program])
+REQUIRE_PROG([md5sum],[md5sum_bin],[program])
+REQUIRE_PROG([sha1sum],[sha1sum_bin],[program])
+REQUIRE_PROG([sha256sum],[sha256sum_bin],[program])
 
 # Check for Python modules
 AX_PYTHON_MODULE(lxml,fatal,python3)
diff --git a/debian/changelog b/debian/changelog
index bcc6dfb..5dcbdb9 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,8 +1,11 @@
-thunar-custom-actions (0.0.14) UNRELEASED; urgency=medium
+thunar-custom-actions (0.0.14) unstable; urgency=medium
 
   * include @python3_bin@ in uca-manip
+  * improve security: ask for overwriting permission
+  * revise tempfile system
+  * add checksums action
 
- -- Yann Büchau <nobodyinperson@gmx.de>  Sun, 11 Jun 2017 15:40:29 +0200
+ -- Yann Büchau <nobodyinperson@gmx.de>  Tue, 13 Jun 2017 12:17:08 +0200
 
 thunar-custom-actions (0.0.13) unstable; urgency=medium
 
diff --git a/locale/de/LC_MESSAGES/thunar-custom-actions.po b/locale/de/LC_MESSAGES/thunar-custom-actions.po
index 8e0b7a6..c8206ad 100644
--- a/locale/de/LC_MESSAGES/thunar-custom-actions.po
+++ b/locale/de/LC_MESSAGES/thunar-custom-actions.po
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2017-06-13 10:28+0200\n"
-"PO-Revision-Date: 2017-06-13 10:31+0200\n"
+"POT-Creation-Date: 2017-06-13 12:22+0200\n"
+"PO-Revision-Date: 2017-06-13 12:23+0200\n"
 "Last-Translator: \n"
 "Language-Team: \n"
 "Language: de\n"
@@ -27,8 +27,8 @@ msgstr "Verschlüssele"
 #: locale/tmp_only_uca_commands.sh:3 locale/tmp_only_uca_commands.sh:4
 #: locale/tmp_only_uca_commands.sh:5 locale/tmp_only_uca_commands.sh:6
 #: locale/tmp_only_uca_commands.sh:7 locale/tmp_only_uca_commands.sh:8
-#: locale/tmp_only_uca_commands.sh:10 locale/tmp_only_uca_commands.sh:11
-#: locale/tmp_only_uca_commands.sh:12
+#: locale/tmp_only_uca_commands.sh:11 locale/tmp_only_uca_commands.sh:12
+#: locale/tmp_only_uca_commands.sh:13
 #, sh-format
 msgid "overwrite $base?"
 msgstr "$base überschreiben?"
@@ -36,9 +36,8 @@ msgstr "$base überschreiben?"
 #: locale/tmp_only_uca_commands.sh:1 locale/tmp_only_uca_commands.sh:2
 #: locale/tmp_only_uca_commands.sh:3 locale/tmp_only_uca_commands.sh:4
 #: locale/tmp_only_uca_commands.sh:5 locale/tmp_only_uca_commands.sh:6
-#: locale/tmp_only_uca_commands.sh:7 locale/tmp_only_uca_commands.sh:8
-#: locale/tmp_only_uca_commands.sh:10 locale/tmp_only_uca_commands.sh:11
-#: locale/tmp_only_uca_commands.sh:12
+#: locale/tmp_only_uca_commands.sh:7 locale/tmp_only_uca_commands.sh:11
+#: locale/tmp_only_uca_commands.sh:12 locale/tmp_only_uca_commands.sh:13
 #, sh-format
 msgid "something went wrong copying the file $fileout over to $filefinalout."
 msgstr "Etwas ist beim Kopieren der Datei $fileout nach $filefinalout schiefgegangen."
@@ -83,11 +82,21 @@ msgstr "Auf wie viel Prozent der Originalgröße skalieren?"
 msgid "Scale to $SCALE percent"
 msgstr "Skaliere auf $SCALE%"
 
+#: locale/tmp_only_uca_commands.sh:8
+#, sh-format
+msgid "Select link location"
+msgstr "Ort der Verknüpfung auswählen"
+
 #: locale/tmp_only_uca_commands.sh:8
 #, sh-format
 msgid "The link name has to differ from the target file name."
 msgstr "Der Name des Links muss von der zu verlinkenden Datei abweichen."
 
+#: locale/tmp_only_uca_commands.sh:8
+#, sh-format
+msgid "Could not create link"
+msgstr "Konnte den Link nicht erstellen"
+
 #: locale/tmp_only_uca_commands.sh:9
 #, sh-format
 msgid "Determining file sizes"
@@ -98,7 +107,7 @@ msgstr "Ermittle Dateigrößen"
 msgid "Size"
 msgstr "Größe"
 
-#: locale/tmp_only_uca_commands.sh:9
+#: locale/tmp_only_uca_commands.sh:9 locale/tmp_only_uca_commands.sh:10
 #, sh-format
 msgid "Name"
 msgstr "Name"
@@ -113,32 +122,51 @@ msgstr "Große Elemente"
 msgid "Elements sorted by size"
 msgstr "Elemente nach Größe sortiert"
 
-#: locale/tmp_only_uca_commands.sh:9
+#: locale/tmp_only_uca_commands.sh:9 locale/tmp_only_uca_commands.sh:10
 #, sh-format
 msgid "Double-click to open."
 msgstr "Doppelklick zum öffnen."
 
 #: locale/tmp_only_uca_commands.sh:10
 #, sh-format
+msgid "Determining checksums"
+msgstr "Berechne Prüfsummen"
+
+#: locale/tmp_only_uca_commands.sh:10
+#, sh-format
+msgid "MD5"
+msgstr "MD5"
+
+#: locale/tmp_only_uca_commands.sh:10
+#, sh-format
+msgid "SHA1"
+msgstr "SHA1"
+
+#: locale/tmp_only_uca_commands.sh:10
+#, sh-format
+msgid "SHA256"
+msgstr "SHA256"
+
+#: locale/tmp_only_uca_commands.sh:10
+#, sh-format
+msgid "Checksums"
+msgstr "Prüfsummen"
+
+#: locale/tmp_only_uca_commands.sh:11
+#, sh-format
 msgid "Converting to PDF"
 msgstr "Konvertiere zu PDF"
 
-#: locale/tmp_only_uca_commands.sh:11
+#: locale/tmp_only_uca_commands.sh:12
 #, sh-format
 msgid "Concatenating PDFs"
 msgstr "Füge PDFs zusammen"
 
-#: locale/tmp_only_uca_commands.sh:12
+#: locale/tmp_only_uca_commands.sh:13
 #, sh-format
 msgid "Optimizing PDF"
 msgstr "Optimiere PDF"
 
-#~ msgid "select link location"
-#~ msgstr "Ort der Verknüpfung auswählen"
-
-#~ msgid "could not create link"
-#~ msgstr "konnte den Link nicht erstellen"
-
 #~ msgid "size"
 #~ msgstr "Größe"
 
@@ -508,9 +536,6 @@ msgstr "Optimiere PDF"
 #~ msgid "Device file '{}' does not exist."
 #~ msgstr "Gerätedatei '{}' existiert nicht."
 
-#~ msgid "Checksum error"
-#~ msgstr "Prüfsummenfehler"
-
 #~ msgid "(never mind if {}"
 #~ msgstr "(egal, wenn '{}'"
 
diff --git a/m4/tuca.m4.in b/m4/tuca.m4.in
index 7f3e3fb..8301a11 100644
--- a/m4/tuca.m4.in
+++ b/m4/tuca.m4.in
@@ -19,6 +19,9 @@ define(<~TUCA_PANDOC~>,<~@pandoc_bin@~>)dnl
 define(<~TUCA_PYTHON3~>,<~@python3_bin@~>)dnl
 define(<~TUCA_GETTEXT~>,<~@gettext_bin@~>)dnl
 define(<~TUCA_GETTEXTSH~>,<~@gettextsh_bin@~>)dnl
+define(<~TUCA_MD5SUM~>,<~@md5sum_bin@~>)dnl
+define(<~TUCA_SHA1SUM~>,<~@sha1sum_bin@~>)dnl
+define(<~TUCA_SHA256SUM~>,<~@sha256sum_bin@~>)dnl
 dnl metadata from ./configure
 define(<~TUCA_PACKAGE_NAME~>,<~@PACKAGE_NAME@~>)dnl
 dnl paths from ./configure
@@ -194,9 +197,9 @@ file $TUCA_OUT_VAR() over to $TUCA_FINAL_OUT_VAR().));dnl
 fi) dnl
 ~>)dnl
 dnl
-dnl TUCA_LOOP(command,[description],[outfile])
+dnl TUCA_LOOP(command,[description])
 dnl - loop over TUCA_ALL_FILES
-dnl - execute "command" on each file with TUCA_CREATE_FILE
+dnl - execute "command" on each file 
 dnl - use TUCA_PROGRESSBAR_TEXT to show "description" followed by the current 
 dnl   file
 dnl - use TUCA_PROGRESSBAR_PERCENTAGE to show current progress
@@ -211,9 +214,9 @@ dnl calculate current percentage
 dnl get 
  TUCA_FILE_BASE_VAR()=$(basename TUCA_FILE());dnl current file's basename
 dnl update progressbar text
- TUCA_PROGRESSBAR_TEXT($2 ... TUCA_FILE_BASE());dnl
- dnl run command on TUCA_FILE, save to TUCA_FILE if "outfile" is unspecified
- TUCA_CREATE_FILE($1,TUCA_FILE(),ifelse($3,,TUCA_FILE(),$3));dnl
+ TUCA_PROGRESSBAR_TEXT($2 ... <~~>TUCA_FILE_BASE());dnl
+ dnl run command 
+ ($1);dnl
  dnl update progressbar percentage
  TUCA_PROGRESSBAR_PERCENTAGE($PERCENTAGE);dnl
 done<~~>dnl
diff --git a/share/thunar-custom-actions/system-uca/gpg.xml.m4 b/share/thunar-custom-actions/system-uca/gpg.xml.m4
index 095239d..c9bc34e 100644
--- a/share/thunar-custom-actions/system-uca/gpg.xml.m4
+++ b/share/thunar-custom-actions/system-uca/gpg.xml.m4
@@ -12,9 +12,12 @@ include(tuca.m4)dnl
     PASSWORD=$(TUCA_PASSWORD()) || exit;dnl
     TUCA_PROGRESSBAR(dnl
         TUCA_LOOP(dnl
-            echo $PASSWORD | TUCA_GPG2() --batch --yes --passphrase-fd 0 --symmetric --armor -o TUCA_OUT() TUCA_IN(),dnl
-            TUCA_TRANSLATE(Encrypting),dnl
-            TUCA_IN().asc,dnl output name
+            TUCA_CREATE_FILE(dnl
+                echo $PASSWORD | TUCA_GPG2() --batch --yes --passphrase-fd 0 --symmetric --armor -o TUCA_OUT() TUCA_IN(),dnl
+                TUCA_FILE(),dnl input
+                TUCA_FILE().asc,dnl output
+                ),dnl
+            TUCA_TRANSLATE(Encrypting),dnl loop description
             )dnl
         )dnl
     )</command>
@@ -35,10 +38,13 @@ include(tuca.m4)dnl
     PASSWORD=$(TUCA_PASSWORD()) || exit;dnl
     TUCA_PROGRESSBAR(dnl
         TUCA_LOOP(dnl
-            echo $PASSWORD | TUCA_GPG2() --batch --yes --passphrase-fd 0 --decrypt -o TUCA_OUT() TUCA_IN() || FAIL=yes;dnl
-            if test -n "$FAIL";then TUCA_ERROR(TUCA_TRANSLATE(Wrong Password for $TUCA_FILE_BASE_VAR()?));exit;fi,dnl
-            TUCA_TRANSLATE(Decrypting),dnl
-            $(dirname TUCA_IN())/$(basename TUCA_IN() .asc),dnl output name
+            TUCA_CREATE_FILE(dnl
+                echo $PASSWORD | TUCA_GPG2() --batch --yes --passphrase-fd 0 --decrypt -o TUCA_OUT() TUCA_IN() || FAIL=yes;dnl
+                if test -n "$FAIL";then TUCA_ERROR(TUCA_TRANSLATE(Wrong Password for $TUCA_FILE_BASE_VAR()?));exit;fi,dnl
+                TUCA_FILE(),dnl input
+                $(dirname TUCA_FILE())/$(basename TUCA_FILE() .asc),dnl output name
+                ),dnl
+            TUCA_TRANSLATE(Decrypting),dnl loop description
             )dnl
         )dnl
     )</command>
diff --git a/share/thunar-custom-actions/system-uca/images.xml.m4 b/share/thunar-custom-actions/system-uca/images.xml.m4
index 6b182ee..74f6c1a 100644
--- a/share/thunar-custom-actions/system-uca/images.xml.m4
+++ b/share/thunar-custom-actions/system-uca/images.xml.m4
@@ -11,8 +11,12 @@ include(tuca.m4)dnl
 	<command>TUCA_CMD(dnl
     TUCA_PROGRESSBAR(dnl
         TUCA_LOOP(dnl
-            TUCA_CONVERT() -rotate 90 TUCA_IN() TUCA_OUT(),dnl
-            TUCA_TRANSLATE(Rotating clockwise),dnl
+            TUCA_CREATE_FILE(dnl
+                TUCA_CONVERT() -rotate 90 TUCA_IN() TUCA_OUT(),dnl
+                TUCA_FILE(),dnl input
+                TUCA_FILE(),dnl output
+                ),dnl
+            TUCA_TRANSLATE(Rotating clockwise),dnl loop description
             )dnl
         )dnl
     )</command>
@@ -28,12 +32,15 @@ include(tuca.m4)dnl
 	<command>TUCA_CMD(dnl
     TUCA_PROGRESSBAR(dnl
         TUCA_LOOP(dnl
-            TUCA_CONVERT() -rotate 270 TUCA_IN() TUCA_OUT(),dnl
+            TUCA_CREATE_FILE(dnl
+                TUCA_CONVERT() -rotate 270 TUCA_IN() TUCA_OUT(),dnl
+                TUCA_FILE(),dnl input
+                TUCA_FILE(),dnl output
+                ),dnl
             TUCA_TRANSLATE(Rotating anti-clockwise),dnl
             )dnl
         )dnl
-    )</command>
-	<description xml:lang="en">The selected images are turned anti-clockwise.</description>
+    )</command> <description xml:lang="en">The selected images are turned anti-clockwise.</description>
 	<description xml:lang="de">Die ausgewählten Bilder werden gegen den Uhrzeigersinn gedreht.</description>
 	<patterns>*</patterns>
 	<image-files/>
@@ -45,7 +52,11 @@ include(tuca.m4)dnl
 	<command>TUCA_CMD(dnl
     TUCA_PROGRESSBAR(dnl
         TUCA_LOOP(dnl
-            TUCA_CONVERT() TUCA_IN() -set colorspace Gray -separate -average TUCA_OUT(),dnl
+            TUCA_CREATE_FILE(dnl
+                TUCA_CONVERT() TUCA_IN() -set colorspace Gray -separate -average TUCA_OUT(),dnl
+                TUCA_FILE(),dnl input
+                TUCA_FILE(),dnl output
+                ),dnl
             TUCA_TRANSLATE(Converting to grayscale),dnl
             )dnl
         )dnl
@@ -64,7 +75,11 @@ include(tuca.m4)dnl
     COLOR=$(TUCA_COLOR_SELECTION()) || exit;dnl ask user for fill color
     TUCA_PROGRESSBAR(dnl
         TUCA_LOOP(dnl
-            TUCA_CONVERT() TUCA_IN() -background "$COLOR" -alpha remove TUCA_OUT(),dnl
+            TUCA_CREATE_FILE(dnl
+                TUCA_CONVERT() TUCA_IN() -background "$COLOR" -alpha remove TUCA_OUT(),dnl
+                TUCA_FILE(),dnl input
+                TUCA_FILE(),dnl output
+                ),dnl
             TUCA_TRANSLATE(Filling transparency with $COLOR),dnl
             )dnl
         )dnl
@@ -82,7 +97,11 @@ include(tuca.m4)dnl
     SCALE=$(TUCA_ZENITY() --text="TUCA_TRANSLATE(Scale to what percentage?)" --scale --value=50 --min-value=1 --max-value=99) || exit;dnl
     TUCA_PROGRESSBAR(dnl
         TUCA_LOOP(dnl
-            TUCA_CONVERT() TUCA_IN() -resize ${SCALE}%% TUCA_OUT(),dnl
+            TUCA_CREATE_FILE(dnl
+                TUCA_CONVERT() TUCA_IN() -resize ${SCALE}%% TUCA_OUT(),dnl
+                TUCA_FILE(),dnl input
+                TUCA_FILE(),dnl output
+                ),dnl
             TUCA_TRANSLATE(Scale to $SCALE percent),dnl
             )dnl
         )dnl
diff --git a/share/thunar-custom-actions/system-uca/misc.xml.m4 b/share/thunar-custom-actions/system-uca/misc.xml.m4
index a0c5d6d..13e324c 100644
--- a/share/thunar-custom-actions/system-uca/misc.xml.m4
+++ b/share/thunar-custom-actions/system-uca/misc.xml.m4
@@ -9,12 +9,12 @@ include(tuca.m4)dnl
 	<name xml:lang="de">Verknüpfung erstellen</name>
 	<name xml:lang="en">Create link to this file</name>
 	<command>TUCA_CMD(dnl
-        TARGET="$(TUCA_ZENITY() --file-selection --title="Select link location)" --save --filename TUCA_FIRST_FILE())" || exit;dnl
+        TARGET="$(TUCA_ZENITY() --file-selection --title="TUCA_TRANSLATE(Select link location)" --save --filename TUCA_FIRST_FILE())" || exit;dnl
         if test "$TARGET" = TUCA_FIRST_FILE();then dnl
         TUCA_ERROR(TUCA_TRANSLATE(The link name has to differ from the target file name.));exit;dnl
         fi;dnl
         TUCA_CREATE_FILE(dnl
-            ln -sf TUCA_IN() TUCA_OUT() || TUCA_ERROR(Could not create link)),dnl command
+            ln -sf TUCA_IN() TUCA_OUT() || TUCA_ERROR(TUCA_TRANSLATE(Could not create link)),dnl command
             TUCA_FIRST_FILE(),dnl input
             $TARGET,dnl output
            notmpfile,dnl no tempfile needed
@@ -58,5 +58,42 @@ include(tuca.m4)dnl
 	<patterns>*</patterns>
 	<directories/>
 </action>
+<action>
+	<icon>checkbox-checked-symbolic</icon>
+	<name xml:lang="de">Prüfsummen</name>
+	<name xml:lang="en">Checksums</name>
+	<command>TUCA_CMD(dnl
+    TMPFILE=$(mktemp);dnl
+    TUCA_PROGRESSBAR(dnl
+        TUCA_LOOP(dnl
+            basename TUCA_FILE() >> $TMPFILE;dnl
+            TUCA_MD5SUM()    TUCA_FILE() | cut -d' ' -f1 >> $TMPFILE;dnl
+            TUCA_SHA1SUM()   TUCA_FILE() | cut -d' ' -f1 >> $TMPFILE;dnl
+            TUCA_SHA256SUM() TUCA_FILE() | cut -d' ' -f1 >> $TMPFILE;dnl
+            ,dnl command
+            TUCA_TRANSLATE(Determining checksums),dnl loop description
+            ),dnl
+        TUCA_TRANSLATE(Determining checksums),dnl title
+        );dnl 
+    cat $TMPFILE | dnl
+        TUCA_ZENITY() --list dnl
+            --column="TUCA_TRANSLATE(Name)" dnl
+            --column="TUCA_TRANSLATE(MD5)" dnl
+            --column="TUCA_TRANSLATE(SHA1)" dnl
+            --column="TUCA_TRANSLATE(SHA256)" dnl
+            --title="TUCA_TRANSLATE(Checksums)" dnl
+            --text="TUCA_TRANSLATE(Checksums)\n<~~>TUCA_TRANSLATE(Double-click to open.)" dnl
+            --print-column 1 | dnl
+        TUCA_XARGS() -r --delimiter='\n' TUCA_XDG_OPEN();dnl
+    rm "$TMPFILE")</command>
+	<description xml:lang="de">Verschiedene Prüfsummen der ausgewählten Dateien anzeigen.</description>
+	<description xml:lang="en">Show different checksums of the selected files.</description>
+	<patterns>*</patterns>
+	<audio-files/>
+	<image-files/>
+	<other-files/>
+	<text-files/>
+	<video-files/>
+</action>
 </actions>
 
diff --git a/share/thunar-custom-actions/system-uca/pdf.xml.m4 b/share/thunar-custom-actions/system-uca/pdf.xml.m4
index bdfa7d8..7fe6c9f 100644
--- a/share/thunar-custom-actions/system-uca/pdf.xml.m4
+++ b/share/thunar-custom-actions/system-uca/pdf.xml.m4
@@ -59,12 +59,16 @@ include(tuca.m4)dnl
 	<command>TUCA_CMD(dnl
     TUCA_PROGRESSBAR(dnl
         TUCA_LOOP(dnl
-            TUCA_GS() -dBATCH -dNOPAUSE -q -dPDFSETTINGS=/screen dnl
-            -sDEVICE=pdfwrite -dDownsampleColorImages=true dnl
-            -dDownsampleGrayImages=true -dDownsampleMonoImages=true dnl
-            -dColorImageResolution=72 -dGrayImageResolution=72 dnl
-            -dMonoImageResolution=72 -sOutputFile=TUCA_OUT() TUCA_IN(),dnl cmd
-            TUCA_TRANSLATE(Optimizing PDF),dnl description
+            TUCA_CREATE_FILE(dnl
+                TUCA_GS() -dBATCH -dNOPAUSE -q -dPDFSETTINGS=/screen dnl
+                -sDEVICE=pdfwrite -dDownsampleColorImages=true dnl
+                -dDownsampleGrayImages=true -dDownsampleMonoImages=true dnl
+                -dColorImageResolution=72 -dGrayImageResolution=72 dnl
+                -dMonoImageResolution=72 -sOutputFile=TUCA_OUT() TUCA_IN(),dnl cmd
+                TUCA_FILE(),dnl input
+                TUCA_FILE(),dnl output
+                ),dnl
+            TUCA_TRANSLATE(Optimizing PDF),dnl loop description
             )dnl
         )dnl
     )</command>