Are you on the lookout for ways to earn credit card rewards points or miles quicker? If you are already an avid online shopper and you haven't yet mustered the energy to start shopping through online shopping portals, now's the time to make the change.

Instead of going to your favorite online stores' websites directly like you normally would, shopping through online shopping portals will give each dollar you spend on your rewards credit card of choice more mileage. It is just a matter of clicking through the online shopping portal(s) which you have signed up for, to get to your favorite online stores. Of course, you are required to be logged in to the shopping portal(s) you are using.

While shopping through online shopping portals may sound a tad troublesome, in actual fact, you get to double-dip every time you go on your online shopping sprees. You earn your regular rewards, as well as any bonus rewards points or miles. This is a smart way to rack up your rewards efficiently without having to jump through too many hoops.

That said, keep in mind the number of bonus rewards points or miles that you can potentially earn greatly depends on the shopping portal you use as well as the online retailer you are purchasing from.

It pays to do your research and choose the online shopping portals that will let you earn points or miles in your preferred loyalty programs.

Many major airlines and hotel chains all offer their own shopping portals for members to use, such as Alaska Airlines' Mileage Plan Shopping; JetBlue's TrueBlue Shopping; Delta's SkyMiles Shopping; American Airlines' Aadvantage eShopping Mall; Hawaiian Airlines' Online Mall; Singapore Airlines' KrisFlyer Spre; United Airlines' MileagePlus Shopping ;Southwest Airlines' Rapid Rewards Shopping; Wyndham's Wyndham Rewards Shopping; Choice Hotel's Choice Privileges Mall; IHG Rewards Club's Partner Offers; Hilton Honors' Shopping Mall and more.

Credit card issuer Chase has its own Shop through Chase portal that lets cardholders who earn Chase Ultimate Rewards earn extra points. Similarly, Barclaycard RewardsBoost lets Barclaycard members earn additional rewards with zero extra effort.

Amtrak Guest Rewards, Upromise Shopping and MyPoints also let you earn extra rewards for shopping through their respective portal. Rakuten Rewards is another option you can consider if you are looking to earn cash back on your online shopping purchases; it was formerly known as Ebates.

Denise Bay is a staff writer at GET.com. Email: denise.bay@get.com.