#  `inject`

Inject code at start or end of page content streams
## Usage
> pdftl `<input>` `inject` `<injection_spec>...` `output` `<file>` `[<option...>]`

## Details
Add PDF code `<code>` at head or tail of page content streams for pages.

`<injection_spec> = [<spec>...] (head|tail) <code>`

where `<spec>` is a page specification (default: all pages),
and `<code>` is a PDF content stream fragment to instead at
either the head or tail of those pages' streams.

**Warning:** This can easily break content streams.
The resulting PDF files will not render as expected.
## Examples

> Scale up page content by 2x:
```
pdftl in.pdf inject head '2 0 0 2 0 0 cm' output out.pdf
```


**Tags**: in_place, dangerous, content_stream

*Source: pdftl.operations.inject*

*Read online: [https://pdftl.readthedocs.io/en/stable/operations/inject.html](https://pdftl.readthedocs.io/en/stable/operations/inject.html)*

*Type: Operation*