The one i would recommend is LifePoints
they give you the most points per survey and allow you to withdraw money using PayPal and Amazon Gift Cards..The best ways to earn money online usually need a slight investment but using online paid surveys are completely for free
you could also try Bitcoin mining, but in order to make the most profits from this you would need to invest in Bitcoin cloner which i have a link in this answer: Wilson Goodman’s answer to How can I make 50 bucks a day? I recommend you check that out, if you worried about money this method will give you a profit within 2 weeks so it is totally worth… Ask me how on via WhatsApp +1 (641)200-1079. For more info.
Blockstream 