Do you mean the ‘WebGlaze’ service they offer on the developer’s website?
I’ve only been reading about this recently, but I think it’s important to clarify for anyone who isn’t familiar with the project; Both Glaze and Nightshade are developed by the same team and (as far as I’ve understood it) are designed to be used in tandem. Both are available as downloadable apps (but not for Linux 
).
I also learnt there’s an art site called Cara which can apply Glaze and Nightshade (not sure if the latter is available yet) to your uploads. I haven’t signed up for it myself but it looks interesting. The format reminds me of Artstation:
On a related note - Glaze was recently updated to version 2.0. There was an article about it on Muddy Colors: