Barb Binder • Adobe Community Professional, Sep 30, 2020
What format is the file? If it is an Illustrator file, just select the black rectangle and delete it.
If it is a bitmap (jpg, png, psd, etc), I would do this in Photoshop and not Illustrator. Select the letters, remove the background—multiple options depending on your Photoshop abilities.
In both apps, use File > Export > Export as to save as an SVG file.