Gyazo has an "auto login" feature that allows you to login without a password
It's simple: launch Gyazo and upload captures. A new tab will open after capturing, and you will be logged in to your account on that screen.
It is a very useful feature for people who think things like:
Entering an email address and password is troublesome ...
I often forget my password ...
I don't remember my registered email address ...
In the following cases, auto login can't be used.
When you buy a new computer and freshly start using Gyazo
When you reinstall your computer OS
When the device is disconnected from the account (see : Connect your account with multiple computers)