---
title: pdftk()
subtitle: "A wrapper for the PDF toolkit Pdftk"
date: '2017-04-04'
slug: pdftk
---

If the toolkit Pdftk is available in the system, it will be called to
manipulate the PDF files (especially to compress the PDF files).

This is a wrapper to call `pdftk`. The path of `pdftk` should
be set via `ani.options(pdftk = 'path/to/pdftk')`.

See the reference for detailed usage of `pdftk`.
 
```{r, cache=TRUE, interval=.1, eval=FALSE}
library(animation)
pdf('huge-plot.pdf')
plot(rnorm(50000))
dev.off()

## Windows
ani.options(pdftk = 'D:/Installer/pdftk.exe')
pdftk('huge-plot.pdf', output = 'huge-plot0.pdf')

## Linux (does not work??)
ani.options(pdftk = 'pdftk')
pdftk('huge-plot.pdf', output = 'huge-plot1.pdf')

ani.options(pdftk = NULL)

file.info(c('huge-plot.pdf', 'huge-plot0.pdf', 'huge-plot1.pdf'))['size']
```
