When you start a new Inkscape document, it may look like the background is simply solid white. This is not the case, because that white background is actually completely transparent by default. If you’re having some questions about this, allow me to explain.
1. Save PNG With Transparent Background
A common issue I’ve seen is that some people will head up to File > Save As, and then save as a PNG file. If you create your PNG this way, you will indeed end up with a solid white, non-transparent background.
In order to achieve the transparent background, you must go to File > Export PNG Image. You’ll see a menu pop up where you can select a Filename and then Export.
2. Changing the Background Color
If you want to change the color or transparency of the Inkscape document background, go to File > Document Properties, and click the Background color button on the bottom.
Now you can choose a specific background color and change the Alpha channel to adjust transparency. Inkscape also notes that the transparency will only be used for exporting, not editing.
3. What About Other File Types?
Almost all vector file types such as SVG, PDF, or WMF will also respect the transparency of the background (and other objects for that matter).
Now We’re Transparent!
After going over a few things about default settings and changing background colors, hopefully you can now create graphics with transparent backgrounds. Thanks for reading!