diff --git a/tools/png-pre-compress b/tools/png-pre-compress
index 3edb26db9..fe9a8f411 100755
--- a/tools/png-pre-compress
+++ b/tools/png-pre-compress
@@ -7,5 +7,12 @@ for f in `find $(dirname $0)/../app/src/ -type f -name \*.png`; do
     echo $f | grep -Eo '\.9\.png$' && continue  # do not optimized 9-patch, it breaks them
     tmpfile=$(mktemp)
     aapt singleCrunch -v -i $f -o $tmpfile
+    exiftool -all= $tmpfile
     mv $tmpfile $f
 done
+
+for f in metadata/*/images/*Screenshots/*.png; do
+    exiftool -all= $f
+    tmpfile=$(mktemp)
+    (zopflipng --filters=01234mepb --lossy_8bit --lossy_transparent -y $f $tmpfile && mv $tmpfile $f) &
+done