Lunapic

Lunapic is an amazing photo online editor. If you need to edit photo or make an gif animation quick or you don't have your off-line photo editor than Lunapic is a right tool for you.

It has user friendly interface, as all classic photo editors. And much more.

File manipulation

You can upload images from your computer or from URL, also website screenshots supported and many more.

Editing files

You have undo history list, copy&paste to and from the clipboard, cropping, magic wand, scale, resize, etc.

Adjusting files

Starts from light levels and up to 30 operations.

Drawing

From painting tool up to memes, inspirational posters, and holiday cards.

Effects

More than 60 filters and effects.

But the most powerful is in art painting from famous instant art works up to your specific styles.
Animations are supported also. You have more than 15 animation effects such as rotating cube, reflecting water, kaleidoscoper, etc.

Very useful for converting video files to gif animations from my perspective.