The web UI now mirrors the CLI defaults: same destination URL baseline, same 4000px render, same built-in logo fallback, same output filename.
If you leave the upload empty, the generator uses genie.png. The preview switches instantly when you choose your own PNG.
The download starts immediately when generation succeeds. If something is invalid, the page keeps your current values and shows the error inline.
Keep the built-in logo or swap in a custom PNG for this run only.