Almost invisible lines


In this PDF, in the last page, the lines are very thin and almost invisible, although it displays properly in pdf.js.

I’m using Sumatra 3.1.2 64bit on Windows 10

Feature request: Lineweight control in lineart/vector pdf

This is tracked by


I really love Sumatra and try to use it as my favorite pdf reader. I find, though, some small limits.
One is related with lines display. I have the opposite problem, compared to aldofintel.
I have drawings where the line width is too large and I loose sight of small details.
Is there a way of toggling on/off the line width display, as in other pdf reader (typically, ctrl+5)?