Instasize is an app available for iOS, Android and Windows Phone. I use it on my Samsung Galaxy S5 all the time, and it allows me to resize the photos I wanna share so they fit for Instagram.
As you might already know, Instagram doesn’t allow to share photos bigger than a certain resolution. But InstaSize fits your picture to be uploaded. The app can be used to upload pictures on other social media services as well, like Twitter or Facebook.
Available now on AppStore, Google Play and Windows Store.
Click on the picture to learn more.