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> All processing happens in your browser. Your images never leave your device - complete privacy guaranteed.

Personally I don't trust claims like this unless the source code is available, which doesn't seem to be the case from my browsing

It is easy to verify that:

One way to demonstrate that all processing is being done locally is to load the website, disconnect from the internet, and then use the site.

This is no proof that it doesn't send any data when used for conversions online.

It even could work offline, cache/store data and send it when back online.

No, it is not easy to verify without looking at the source code.