diff --git a/sys/tex2html.sh b/sys/tex2html.sh
index 375c1f1..2ecdc94 100755
--- a/sys/tex2html.sh
+++ b/sys/tex2html.sh
@@ -95,7 +95,7 @@ for i in ../content/*; do
           # copy image file with new name
           cp -f "$img" ../output/images/$fimg
           # convert thumbs
-          convert ../output/images/$fimg -resize 400x400\>  ../output/thumbs/$fimg
+          convert ../output/images/$fimg -resize 800x800\>  ../output/thumbs/$fimg
           # replace image name in main tmp/content.textile file
           # pandoc can't render textile links
           sed -i "s/!images\/$fn!/<a data-lightbox='$folder' href='images\/$fimg'>!thumbs\/$fimg!<\/a>/g" tmp/content.textile