The service, which claims to have over a billion users globally, also said it will not introduce any third-party ads for monetisation.
"Nearly a billion people around the world today rely on WhatsApp to stay in touch with their friends and family... WhatsApp will no longer charge subscription fees," WhatsApp said on its official blog.
It further said that while it has asked some of its users to pay a fee for using WhatsApp after their first year, but "as we've grown, we've found that this approach hasn't worked well".
The company, which was acquired by Facebook for USD 19 billion in 2014, said it was going to experiment with new models to stay ad-free.
More From This Section
"...Over the next several weeks, we'll remove fees from the different versions of our app and WhatsApp will no longer charge you for our service," it said.
The company said starting this year, it will test tools which will allow its users to communicate with businesses and organisations through its platform.
"That could mean communicating with your bank about whether a recent transaction was fraudulent, or with an airline about a delayed flight.