title: Qpdf PDF Manipulator
tags: pdf

[Qpdf](https://qpdf.readthedocs.io/en/stable/) is a command line PDF manipulation tool.

## Examples
These join the [6x6 Hard Inky puzzles](https://krazydad.com/inkies/index.php?vol=2&sv=6H), removing the answer sheet, if you're wondering what this command does.
```bash
qpdf --empty --pages INKY_v2_6H_b001_1pp.pdf 1-8 INKY_v2_6H_b002_1pp.pdf 1-8 INKY_v2_6H_b003_1pp.pdf 1-8 INKY_v2_6H_b004_1pp.pdf 1-8 INKY_v2_6H_b005_1pp.pdf 1-8 -- combined/InkyKenken_6H_1pp_B1-5.pdf
```
Or put this in e.g. `catlist`
```
--empty
--pages
INKY_v2_6H_b001_1pp.pdf
1-8
INKY_v2_6H_b002_1pp.pdf
1-8
INKY_v2_6H_b003_1pp.pdf
1-8
INKY_v2_6H_b004_1pp.pdf
1-8
INKY_v2_6H_b005_1pp.pdf
1-8
--
combined/InkyKenken_6H_1pp_B1-5.pdf
```
and then
```bash
qpdf @catlist
```

## Rotate
Rotate only pages 1 and 3:
```
qpdf in.pdf --rotate=180:1,3 out.pdf
```