Hello,
I'm looking for the best, cleanest way to convert a PSD file I have into a Scratch-ready and clean sprite, or SVG. I was wondering if anyone had a good idea about how to do this and what sites I may use to do so.
Thanks!

PSD, the Photoshop format?
You could open it in Photoshop then export it. Illustrator should be able to handle vectorization if you want an SVG. My ability to help with Adobe software is limited due to lack of experience.

If you don't have Photoshop, you could try Photopea, which is free and runs in the browser.