diff --git a/voussoir.net/writing/makethumbs.bat b/voussoir.net/writing/makethumbs.bat
new file mode 100644
index 0000000..356ce83
--- /dev/null
+++ b/voussoir.net/writing/makethumbs.bat
@@ -0,0 +1,6 @@
+rem A width of 905 makes the image occupy the entire horizontal width of the
+rem article, at least with the current font settings.
+md thumbs
+resize *.jpg 905 0 --only-shrink --destination thumbs --inplace --quality 50
+resize *.png 905 0 --only-shrink --destination thumbs --inplace --quality 50
+optipng thumbs\*.png