Javascript image editor library

Pixastic has a simple Javascript image editor that uses Canvas.

When it comes to transformations, fabricJS looks very good: http://fabricjs.com/

For effects, CamanJS seems to give a lot of control and also includes preset filters : http://camanjs.com/examples/

If you develop your app using a full-featured JavaScript-based framework, like Cappuccino or SproutCore, this kind of lightweight image manipulation should be trivial to implement.

If you want a bit more flexibility with the site implementation, go with a smaller library like jQuery UI or Interface Elements (that's a very incomplete list - there are tons of similar libraries around).

You can use DarkRoom. it's a simple and powerful image editor in the web. you can find it from the below link : https://mattketmo.github.io/darkroomjs/