title: Convert Pdf to Png with Image Magick
tags: #convert #pdf #png #image #imagemagick #magick

This uses Image Magick (or [ImageMagick](https://imagemagick.org/index.php))
```bash
convert -density 150 presentation.pdf -quality 90 output-%3d.jpg # all pages
convert -density 150 presentation.pdf[0] -quality 90 test.jpg # one page
convert -density 150 presentation.pdf[0] -quality 90 -resize 50% test.jpg
```
To force width, use resize and a height larger than needed, e.g. for A4 we can use a height twice the desired width (`-resize` will not stretch to fill, but resize until the image just fits in the box).
```bash
convert -density 300 inv1.pdf -resize 1920x3840 -quality 80 inv1-%02d.jpg
```
also
```bash
convert -density 300 inv1.pdf -resize 1920x3840 -background white -alpha remove -alpha off %d.png
```

## Cygwin
Make sure you have ghostscript installed.

## Security Error
If you get
```
attempt to perform an operation not allowed by the security policy `PDF'
```
then edit `/etc/ImageMagic-6/policy.xml` and find
the line
```xml
    <policy domain="coder" rights="none" pattern="PDF" />
```
and change it to
```xml
    <policy domain="coder" rights="read|write" pattern="PDF" />
```