Real-ESRGAN in this tab. Your CPU does the work. The file never leaves the machine. No tokens, no VRAM card.
The strongest stack that still runs without a VRAM card. Flagship Real-ESRGAN x4plus, then GFPGAN on every detected face. First visit loads about 407 MB. A real photo can take 10–40 minutes. Do not close the tab.
This is not the fast tool above. It will sit there. That is the point.