Amazon is the largest online retailer in the world according to Internet Retailer's Top 500 Guide, as of August 2011. It's a rare person who doesn't occasionally purchase something from this online department store. Multiple sites online give you the ability to earn free Amazon online gift cards or credits. Sign up with the sites and perform certain tasks. Once you've finished the job you'll have credit in your Amazon account that you can use to purchase any item on the site.
Navigate to the Swagbucks website. Sign up for an account by choosing a user name and password and giving the site your email address. Log on to the site daily and perform required tasks to earn points. Do normal searches through the Swagbucks search engine to earn random points, take polls each day to earn a point or turn in old cellphones or books to earn points. Turn in your points every time you earn 450 of them to receive $5 in Amazon or Amazon.ca credit.
Navigate to the Amazon Mechanical Turk website and sign up for an account. Mechanical Turk is a crowdsourcing site connected to Amazon. Companies pay small amounts of Amazon credit to users who do small and often mindless tasks that are better done by many humans than by computers. Check out the way websites look, make sure URLs link to the correct address or make sure no one in any of a group of photos is making an obscene gesture. Each small task can earn you pennies to a few dollars, but they can add up to large amounts of Amazon credit for mindless tasks done while watching TV.
Navigate to the TestSpin website and sign up for an account. TestSpin is a market research firm specializing in testing Web content. Sign up to test music videos or online products, check out websites or join surveys. Once you successfully complete each task you have to fill out a survey or join a focus group about the subject, and then you'll be paid in TestSpin dollars, which are redeemable for Amazon credits.