diff --git a/pngzop b/pngzop
new file mode 100755
index 000000000..205f60690
--- /dev/null
+++ b/pngzop
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# pngzop file.png > file_pz.png 
+
+for f in 0 1 2 3 4 5
+do
+  rm -f pngzop-f$f-$$.png
+  pngcrush -q -m 1 -f $f -force $1 pngzop-f$f-$$.png
+  pngidat pngzop-f$f-$$.png
+  zopfli --i25 --zlib pngzop-f$f-$$.idat
+done
+echo `ls -S pngzop-f?-$$.idat.zlib | tail -1`
+rm pngzop-f?-$$.png pngzop-f?-$$.idat pngzop-f?-$$.idat.zlib