I appreciate your work on this project and it's really useful.
When I googled for Cloudflare HAR sanitizer I found the domain: https://har-sanitizer.pages.dev/
However, I was hesitant to use the page as anyone could have made that website and put the Cloudflare name and logo on that domain.
I only could verify it's actually a Cloudflare domain by going to your blog post and going to that page via the link.
To improve the trust in the tool it would be useful to put it on the Cloudflare domain, e.g. https://har-sanitizer.cloudflare.com/