Available for Mac, Poster is a handy app that lets you upload snaps to your Instagram account – no mobile device required.The unofficial Instagram client essentially clones the user interface of the real thing, but ultimately packages it in an Electron wrapper to make it functional on desktop.All you need to do to get started with Poster is download and install it. You can then immediately start uploading pics once you’ve filled in your login details. Please note that you will have to enable downloads from third-party developers in settings to install the app.

Source: Poster lets you upload photos to Instagram straight from your PC