ghostscript

Adding watermark to pdfs

I follow the approach of creating a postscript file and using Ghostscript to add it to every page in the pdf.¹

For my Obsidian-quartz sync, I use the following postscript file:²

<<
   /EndPage
   {
     2 eq { pop false }
     {
         gsave      
         /Helvetica findfont 18 scalefont setfont
         newpath 
         .20 setgray 10 10 moveto
         /copyright glyphshow 
         ( Your Name) show
         grestore
         true
     } ifelse
   } bind
>> setpagedevice

To use it, I run:

gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -o output.pdf watermark.ps input.pdf

Footnotes

1. this and this ↩

2. also can be found here ↩