====== PDF ======
  * [[pdf:briss|briss]]
  * [[pdf:pdf_arranger|PDF Arranger]]
  * [[pdf:krop|krop]]
  * [[java:pdfbox|pdfbox]] Java Library 이지만 독립 애플리케이션으로도 작동함.

  * [[https://www.cutepdf-editor.com/|CutePDF Editor]] Online PDF 편집, Crop 편함.
  * [[https://sites.google.com/site/pdfscissors/|PDF Scissors]] PDF Crop
  * [[http://www.pdfescape.com/|PDF Escape]] PDF 온라인 편집
  * [[http://smallpdf.com/kr|SmallPDF]] PDF 관련 각종 기능 제공

===== OCR =====
  * [[pdf:ocrmypdf|ocrmypdf]]
  * ''gscan2pdf'' : GUI

===== PDF to Image =====
  * [[https://www.baeldung.com/linux/convert-pdf-image|How to Convert PDF to Image in Linux | Baeldung on Linux]]
==== pdftoppm ====

<code sh>
sudo apt install poppler-utils
</code>

<code sh>
#output-1.jpg, output-2.jpg 등의 형태로 내보내기 -jpeg, -png,...
pdftoppm -jpeg input.pdf output
</code>

==== image magick ====

  * [[image_processing:image_magick|Image Magick]]을 사용하면 쉽게 PDF를 Image 파일로 변경할 수 있다.
<code>
convert foo.pdf foo.png
# or
convert -density 150 source.pdf -quality 190 output.jpg
</code>

===== FoxIt Reader =====
  * 상용/무료 PDF Reader. Linux 지원.
  * https://www.foxitsoftware.com/downloads/

===== MuPDF =====
  * http://www.webupd8.org/2012/08/quickly-open-large-pdf-files-even-on.html<code sh>
sudo add-apt-repository ppa:mupdf/stable
sudo apt-get update
sudo apt-get install mupdf
</code>

===== Master PDF Editor =====
  * https://code-industry.net/free-pdf-editor/
  * PDF 편집기. Ubuntu 기본 패키지.

===== page number =====
  * [[http://www.dry-lab.org/blog/2018/numbering-pages-of-a-pdf.html|Numbering the pages of a PDF – Blog of Andrés Aravena]]


===== 참조 =====
  * [[https://www.linuxlinks.com/best-free-open-source-pdf-development-libraries/|8 Best Free and Open Source PDF Development Libraries - LinuxLinks]]
  * [[https://www.youtube.com/watch?v=ie7Jb1KiIBM|The BEST PDF TOOLS for Linux: merge, edit, create, annotate, OCR... - YouTube]] Linux 에서의 각종 PDF 도구들 설명