diff --git a/tutorial/compress_pdf.org b/tutorial/compress_pdf.org
new file mode 100644
index 0000000..cd8215a
--- /dev/null
+++ b/tutorial/compress_pdf.org
@@ -0,0 +1,27 @@
+#+options: toc:nil num:nil
+
+* How to  reduce the size of a pdf file
+
+** Use libreoffice
+
+Open the file with libreoffice. Then export it as pdf with low resolution to reduce
+the file size.
+
+** Use ghostscript
+
+You can use the command ~gs~ to call ghostscript. ghostscript is a PostScript, and PDF language interpreter and previewer.
+
+Let's try to reduce the size of the "cvjb.pdf" and then write it as "output.pdf"
+
+
+#+begin_example sh
+  gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf cvjb.pdf
+#+end_example
+
+** References
+
+Check the manual:
+
+#+begin_example sh
+  man gs
+#+end_example