Best background remover that actually gives full resolution? Everything I tried has a catch

I need to remove backgrounds from product photos for my small shop. I've been using removebg but the free version downscales everything and I'm not paying for that.

Tried Canva too but you need Pro. PhotoRoom puts a watermark. I just need something that works, full res, no watermark.

Doesn't need to be perfect on hair or anything complex, mostly clean product shots on white/solid backgrounds.

Anyone found something decent that's actually free? Online tool preferred, I don't want to install anything