====== PDF files ======

===== edit =====
==== how to redact PDFs ====
Open the PDF in LibreOffice, choose Tools → Redact. You can then export it within the same menu.

==== GUI ====
  * [[https://github.com/jeromerobert/pdfarranger|pdfarranger]] – arrange pdfs, export subsets of pages and stuff.
  * PDFMod – not as good as pdfarranger, use the latter ;) simple GTK GUI for shuffling PDFs around.
    * Shift+Click does rectangular selections. That's a super weird design decision and disqualifies that tool for any serious usage.
  * pdftricks – uses GhostScript for easy manipulations.

==== How to reduce PDF file size in Linux ====

<code bash>gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress -sOutputFile=output.pdf input.pdf</code>

You can use the following parameters for -dPDFSETTINGS:

| ''-dPDFSETTINGS=/screen''  | (screen-view-only quality, 72 dpi images) |
| ''-dPDFSETTINGS=/ebook''   | (low quality, 150 dpi images) |
| ''-dPDFSETTINGS=/printer'' | (high quality, 300 dpi images) |
| ''-dPDFSETTINGS=/prepress''| (high quality, color preserving, 300 dpi imgs) |
| ''-dPDFSETTINGS=/default'' | (almost identical to /screen) |