til/command-line-utils/joining-images-to-pdf.md

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You can join multiple images to pdf using `convert`:
```bash
convert *.png out.pdf
```
If you get an error like
```
convert-im6.q16: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/408.
```
follow the steps below:
```bash
sudo vim /etc/ImageMagick-6/policy.xml
```
and replace the line
```xml
<policy domain="coder" rights="none" pattern="PDF" />
```
with
```xml
<policy domain="coder" rights="read|write" pattern="PDF" />
```
[source](https://askubuntu.com/questions/1081895/trouble-with-batch-conversion-of-png-to-pdf-using-convert)