diff --git a/logo/notes.txt b/logo/notes.txt
index a985aab..7ec7b40 100644
--- a/logo/notes.txt
+++ b/logo/notes.txt
@@ -6,3 +6,4 @@ union everything
 crop canvas
 update metadata
 save as optimized svg
+optimize for web using pngnq
diff --git a/logo/pdf2htmlEX-256x256.png b/logo/pdf2htmlEX-256x256.png
index 97cf4c9..48746c7 100644
Binary files a/logo/pdf2htmlEX-256x256.png and b/logo/pdf2htmlEX-256x256.png differ
diff --git a/logo/pdf2htmlEX-64x64.png b/logo/pdf2htmlEX-64x64.png
index 2238961..51e2905 100644
Binary files a/logo/pdf2htmlEX-64x64.png and b/logo/pdf2htmlEX-64x64.png differ
diff --git a/logo/update_png.sh b/logo/update_png.sh
index f80f69a..64483e6 100755
--- a/logo/update_png.sh
+++ b/logo/update_png.sh
@@ -1,4 +1,8 @@
 #!/bin/sh
 
+# convert raw SVG into png of different sizes
 convert -background none -resize 64x64^ pdf2htmlEX.svg pdf2htmlEX-64x64.png
 convert -background none -resize 256x256^ pdf2htmlEX.svg pdf2htmlEX-256x256.png
+# optimize for web
+pngnq pdf2htmlEX-64x64.png
+mv pdf2htmlEX-64x64-nq8.png ../share/pdf2htmlEX-64x64.png
diff --git a/share/pdf2htmlEX-64x64.png b/share/pdf2htmlEX-64x64.png
index 2238961..e3276fa 100644
Binary files a/share/pdf2htmlEX-64x64.png and b/share/pdf2htmlEX-64x64.png differ