transparency

Inkscape's background is transparent by default. So if there is nothing else behind the object, it's already transparent.

If you need more help than that, we'll need more information.

 -- what kind of object
 -- what else is on the canvas or in the drawing
 -- will this be finished as an SVG file, or will you export to another format
 -- if so, which format
 -- what kind of operating system are you using
 -- which Inkscape version are you using

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