I am looking for a good site where I can upload files, but without ads.
Hum.. You mean someone who provides huge amounts of server space and bandwidth for everyone for free?
I had a feeling I would get an answer like that.
Anywho I want to avoid sites where they bomard you with pics of semi-naked women and gambling adverts to upload files.
Only ad-free solutions would be sharing the file yourself from your computer or sucking up to someone who has access to a servery thing.
If you are a student, then your chool probably gives you some server space..