43 Zeilen
1,7 KiB
Markdown
43 Zeilen
1,7 KiB
Markdown
# pdf-sign
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## What
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A tool to sign PDF files.
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We are here referring to the visible, non-cryptographic squiggles.
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## How
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First, create one or several signatures in the form of small PDF files with transparent backgrounds.
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The recommended way is:
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* Use the included `pdf-create-empty` tool to create an empty, transparent PDF file.
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If 3×2 inch suits you, you can use [empty-3inx2in.pdf](empty-3inx2in.pdf) directly.
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* Use an application of your choice to sign it.
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You can for example use Okular's Freehand Line, or transfer it to your smartphone and use Adobe Acrobat Reader.
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* Put the signed file in `~/.pdf_signatures/`.
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You can now use the `pdf-sign` tool interactively (or non-interactively) to sign PDF files.
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Run `pdf-sign -h` or `pdf-create-empty -h` for details.
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Installation:
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* Install dependencies: `python3.7` or later with module `tkinter`, `gs` (Ghostscript), `pdftk` and `pdfinfo`.
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* Copy one or both tools to a directory in your `$PATH`.
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Installation on Debian:
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```sh
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apt-get update && apt-get install -y coreutils ghostscript git pdftk poppler-utils python3 python3-tk
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git clone https://github.com/svenssonaxel/pdf-sign.git
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cd pdf-sign
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cp pdf-sign pdf-create-empty /usr/local/bin/
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```
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## Why
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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.
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(Non-)alternatives include:
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* Okular: Allows for drawing 'Freehand Line' annotations, but not saving those for later use.
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Allows for inserting custom saved stamps, but these will not be visible in other PDF readers.
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* Evince: Allows for certain kinds of annotations, but nothing that can serve as a signature.
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* pdftk, ghostscript, and other command-line tools: Allows for inserting stamps, but not interactively selecting where.
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