You can use Gyazo to upload captures without signing in but we strongly recommend you create an account and sign in.
Note: If you don't create an account you could lose access when Uninstalling Gyazo or changing your operating system!
Why sign up for Gyazo with an account?
Connect your account with multiple computers, and manage all images uploaded across devices with one account.
You can easily browse your 10 most recent uploads on the Captures page
You can login on other PCs or phones to browse and search your image history
You can create collections to organize image sets and share them all with one link
If you need help with your account, please see these pages: