diff --git a/compresspdf.sh b/compresspdf.sh
new file mode 100644
index 0000000..93efe64
--- /dev/null
+++ b/compresspdf.sh
@@ -0,0 +1,21 @@
+#! /bin/bash
+
+pdffile=$1;
+dpi=$2 
+
+gs \
+  -o "${pdffile%.pdf}-resampled.pdf" \
+  -sDEVICE=pdfwrite \
+  -dDownsampleColorImages=true \
+  -dDownsampleGrayImages=true \
+  -dDownsampleMonoImages=true \
+  -dColorImageResolution=$dpi \
+  -dGrayImageResolution=$dpi \
+  -dMonoImageResolution=$dpi \
+  -dColorImageDownsampleThreshold=1.0 \
+  -dGrayImageDownsampleThreshold=1.0 \
+  -dMonoImageDownsampleThreshold=1.0 \
+   "${pdffile}"
+
+# how to run it:
+# ./compresspdf.sh output.pdf 300
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