Inkscape.org
Beyond the Basics merging files without opening
  1. #1
    4_3 4_3 @4_3

    is it possible to ask to add an option: when selecting files in Explorer, add 2 items in the drop-down menu by pressing the right button:
    1 convert to pdf/svg
    2 (most importantly) combine pdf/png/svg files into 1

  2. #2
    4_3 4_3 @4_3

    Or so:

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