42 Zeilen
1,6 KiB
Markdown
42 Zeilen
1,6 KiB
Markdown
# pdf-sign
|
|
|
|
## What
|
|
|
|
A tool to sign PDF files.
|
|
We are here referring to the visible, non-cryptographic squiggles.
|
|
|
|
## How
|
|
|
|
First, create one or several signatures in the form of small PDF files with transparent backgrounds.
|
|
The recommended way is:
|
|
* Use the included `pdf-create-empty` tool to create an empty, transparent PDF file.
|
|
* Use an application of your choice to sign it.
|
|
You can for example use Okular's Freehand Line, or transfer it to your smartphone and use Adobe Acrobat Reader.
|
|
* Put the signed file in `~/.pdf_signatures/`.
|
|
|
|
You can now use the `pdf-sign` tool interactively (or non-interactively) to sign PDF files.
|
|
|
|
Run `pdf-sign -h` or `pdf-create-empty -h` for details.
|
|
|
|
Installation:
|
|
* Install dependencies: `gs`, `mv`, `pdfinfo`, `pdftk`, `python3` and python3 module `tkinter`.
|
|
* Copy one or both tools to a directory in your `$PATH`.
|
|
|
|
Installation on Debian:
|
|
```sh
|
|
apt-get update && apt-get install -y coreutils ghostscript git pdftk poppler-utils python3 python3-tk
|
|
git clone https://github.com/svenssonaxel/pdf-sign.git
|
|
cd pdf-sign
|
|
cp pdf-sign pdf-create-empty /usr/local/bin/
|
|
```
|
|
|
|
## Why
|
|
|
|
There appears to be a lack of applications that run on Linux and allow for attaching free-hand signatures to PDF files in a good way.
|
|
|
|
(Non-)alternatives include:
|
|
|
|
* Okular: Allows for drawing 'Freehand Line' annotations, but not saving those for later use.
|
|
Allows for inserting custom saved stamps, but these will not be visible in other PDF readers.
|
|
* Evince: Allows for certain kinds of annotations, but nothing that can serve as a signature.
|
|
* pdftk, ghostscript, and other command-line tools: Allows for inserting stamps, but not interactively selecting where.
|