OnPaste is described as 'Fast and simple tool for screenshots and drawing with secure Dropbox and imgur support' and is an website in the Photos & Graphics category. There are more than 50 alternatives to OnPaste, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and Google Chrome. The best alternative is ShareX, which is both free and Open Source. Other great sites and apps similar to OnPaste are Greenshot (Freemium, Open Source), PicPick (Free Personal), Evernote Web Clipper (Free) and Snagit (Paid).
ShareX is a free and open source program that lets you capture or record any area of your screen and share it with a single press of a key. It also allows uploading images, text or other types of files to over 80 supported destinations.
PicPick is an all-in-one software for software developers, graphic designers and home user. It has an intuitive interface and simple, elegant operation. After starting the software, you simply select one of the tool from the PicPick Tools trayicon menu when you want.
CloudApp is the best screenshot editing and video screen recording software. You can record anything on your screen and capture it into an image, a GIF, and a high definition video with sound. Anything you see -- on your webcam, a customer call, a Skype, etc.
Spectacle is a simple application for capturing desktop screenshots. It can capture images of the entire desktop, a single monitor, the currently active window, the window currently under the mouse, or a rectangular region of the screen.
Screenshot and screencast tool that allows for full-screen, window or region-based captures. The built-in editor for screenshots supports cropping and resizing, arrows, text labels, numbering, a blur tool, and border effects.
Skitch is a screenshot editing and sharing utility for Mac and iOS that permits the user to add shapes and text to an image, and then share it online. Images can also be exported to various image formats.
Capture or record any part of your screen. The editor will help you to annotate or blur sensitive info. Fast upload and share with the Short URL. Access screenshot and video recordings from iPhone, iPad or Web.