It's a very unique property. Not among image optimizers, but among tools that can be accessed with any web browser simply by typing a domain name in the address bar. Most of those tools are merely frontends for a server doing the work and as such something that wouldn't even be allowed in many lines of work.
I see what irks you, calling it "privacy-aware" and not something more technical like "installation-free client side", but it can be a pretty cool approach to many rarely-encountered problems.
I'm not much into "JPEG optimization" (whatever that is, I just bite the bullet and wait those ten seconds GIMP takes for startup on my otherwise comically fast Ryzen 9 Windows box whenever I feel like tweaking JPEG compression), but https://hexed.it/ has been a friend for many years: i rarely need a hex editor, but even if I happen to run into a "guess it's time for a hex editor!"-situation twice on the same OS installation (unlikely), the last time would be so long ago that I would have forgotten what I installed. hexed.it is a godsend. Jpeg optimziation is perhaps not quite the same level of problem/solution fit, but it doesn't have to be.
I see what irks you, calling it "privacy-aware" and not something more technical like "installation-free client side", but it can be a pretty cool approach to many rarely-encountered problems.
I'm not much into "JPEG optimization" (whatever that is, I just bite the bullet and wait those ten seconds GIMP takes for startup on my otherwise comically fast Ryzen 9 Windows box whenever I feel like tweaking JPEG compression), but https://hexed.it/ has been a friend for many years: i rarely need a hex editor, but even if I happen to run into a "guess it's time for a hex editor!"-situation twice on the same OS installation (unlikely), the last time would be so long ago that I would have forgotten what I installed. hexed.it is a godsend. Jpeg optimziation is perhaps not quite the same level of problem/solution fit, but it doesn't have to be.