diff --git a/tasks/tcardgen.rake b/tasks/tcardgen.rake
index 2665b88..93f3ae6 100644
--- a/tasks/tcardgen.rake
+++ b/tasks/tcardgen.rake
@@ -1,15 +1,27 @@
 #!/usr/bin/env rake
 
+OGP_DIR = 'static/ogp/'
+CONTENT_DIR = 'content/'
+FONT_DIR = 'assets/font/'
+CONFIG = 'assets/tcardgen.yaml'
+
 desc 'Generate OGP images'
 task :tcard do
-  sh 'find static/ogp/ -type f -name "*.png" | grep -v "base.png" | xargs -t --no-run-if-empty rm'
+  sh "find #{OGP_DIR} -type f -name '*.png' | xargs -t --no-run-if-empty rm"
 
-  Dir.glob("**/*.md", File::FNM_DOTMATCH, base: 'content/').each do |article|
+  Dir.glob("**/*.md", File::FNM_DOTMATCH, base: CONTENT_DIR).each do |article|
     unless article =~ /_index\.md/
-      target = File.join('content', article)
-      sh "tcardgen -f ~/repo/sample-font/ -o static/ogp/ -c config/tcardgen.yaml #{target}"
+      target = File.join(CONTENT_DIR, article)
+      sh "tcardgen -f #{FONT_DIR} -o #{OGP_DIR} -c #{CONFIG} #{target}"
     end
   end
 
-  #sh 'find content/ -type f -name "*.md" | xargs -t -I % tcardgen -f ~/repo/sample-font/ -o static/ogp/ -c config/tcardgen.yaml %'
+  Dir.glob("*.png", File::FNM_DOTMATCH, base: OGP_DIR).each do |png|
+    src = File.join(OGP_DIR, png)
+
+    tmp = File.basename(src, ".*") + ".webp"
+    dest = File.join(OGP_DIR, tmp)
+
+    sh "img2webp -lossy -q 50 #{src} -o #{dest}"
+  end
 end