Command line tools: convert, pandoc, mutool.

• PNG to EPS

  convert input.png eps2:output.eps
  

• PNG to PDF

  mutool convert -o output.pdf input.png
  mutool convert -o output.pdf *.png # multiple images
  

• PDF to TXT

  mutool draw -F txt input.pdf -o output.txt
  

• PDF to PNG (pages 1-10, rotate 90 degree, resolution 200 dpi)

  mutool convert -O rotate=90 resolution=200 -o output%d.png input.pdf 1-10
  

• LaTeX to Docx with bibliography (in IEEE style)

  pandoc -s input.tex --bibliography input.bib --citeproc --csl ieee.csl -o output.docx
  

• LaTeX bibliography to HTML (in IEEE style)

  pandoc -s input.bib --citeproc --csl ieee.csl -o output.html