diff --git a/build.sh b/build.sh
index aac4a04..f2de11b 100755
--- a/build.sh
+++ b/build.sh
@@ -27,6 +27,8 @@ cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wuninitializ
 
 # Run
 ./main
+./thumbnailer.sh
+
 
 # Cleanup
 rm -f ./main
diff --git a/thumbnailer.sh b/thumbnailer.sh
new file mode 100755
index 0000000..d8c8c7e
--- /dev/null
+++ b/thumbnailer.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+
+ROOT=../www
+SRC=../www/img
+SIZE=500
+
+# transform path to /img/*/.thumb/
+pathtrans() {
+  filename=$(echo $1 | awk -F/ '{print $NF}')
+  filename=$(echo ${filename} | awk 'BEGIN{FS=OFS="."}{NF--; print $0}')
+  transform=$(echo $1 | awk 'BEGIN{FS=OFS="/"}{NF--; print $0}')
+  if [ ! -d ${transform}/.thumb ]; then
+    mkdir ${transform}/.thumb/
+  fi
+  transform=${transform}/.thumb/${filename}.png
+  echo ${transform}
+}
+
+# generate thumbnails in /img/*/.thumb/
+
+resize() {
+  output=$(pathtrans $1)
+  if [ ! -f ${output} ]; then
+    convert $1 -strip -auto-orient -resize ${SIZE} -dither FloydSteinberg -colors 16 ${output}
+  fi
+  replace $1 ${output}
+}
+
+# crawl through html and replace src='/img/*/*' with src='/img/*/.thumb/*'
+
+replace() {
+  src=$(echo $1 | sed s#\.\./www##)
+  dest=$(echo $2 | sed s#\.\./www##)
+
+  src=$(echo "src='${src}'")
+  dest=$(echo "src='${dest}'")
+
+  for f in $(find ${ROOT}/*.html); do
+    if grep ${src} ${f}; then
+      sed -i s#${src}#${dest}# $f
+    fi
+  done
+}
+
+echo "creating new thumbnails"
+for x in $(find ${SRC}/*/*); do resize $x exit; done
+echo "done"