Yes, Canva is completely free to use. With a free account, you'll get access 250,000+ free templates, 100+ design types, hundreds of photos and graphics, the ability to collaborate and comments in real time, and 5GB of cloud storage. The free version works best for freelancers who create 10-15 designs per month.
For access to even more assets, features, and storage, you'll need to upgrade to the Pro or Enterprise plans. Thirty day free trials are available so you can be sure you're getting what you need.