How to get free giftcards generator minecraft no surveys?

You can't, those are fake.

There are a lot of scams out there but there are a few legitimate sites out there where you can earn giftcards in exchange for your time. You essentially generate internet traffic for new startups. By playing games, signing up for free trials (actually free) or taking legitimate surveys (provides market research) you earn coins which can be exchanged for giftacards (Wal-Mart, PSN, Amazon, Xbox, ect. Ect.)
Use my invite link for gifthulk and start off with a 250 coin bonus: http://www.gifthulk.com/invite/JP632927

I earned another $20 PSN card today!