A free, advanced, vector-based lens flare rendering software
Fill in document width and height and press "Start editing." In the right panel, use the tabbar to select a component and edit the input fields shown. A preview will appear to the left. To export, press the "download" button at the bottom of the screen. To save information about your flare, select "JSON" as the export type. The contents of the outputted text file can be used in the landing page in the "Savedata" field.