Presentation Tools

Pimagic is an excellent and super-intuitive free online image editor

accessible to anyone without needing to download, register, login or install anything. 

You can easily upload any image you have, and crop it, or apply to it one of several presets which allow you to easily improve it.

Pimagic also offers a set of visual effects, similar to those available in Instagram. 

Images can be saved in either .jpg or .png file formats.

The only function I was not able to find was a resizing tool. Did I miss it? 

Useful. Easy. Immediate.

Free to use. Ad free. 

Try it out now: http://app.pikock.com/pimagic 

Thanks to Ana Cristina Pratas for uncovering this gem.

If I were to recommend an online image/photo editor, that is fast, flexible and that provides all of the tools and features I generally need, I wouldn't hesitate a second in recommending Pixlr.

Not only this free web-based image editor is zippy and responsive as it can get, but it offers three alternative "versions" depending on your needs and skill level.

1) The Open Pixlr Express is the one I use the most, as it offers all of the basic functionalities I generally need, such as cropping, resizing, converting and basic retouching.

2) The Open Pixlr Editor is the advanced version which integrates all of the photo retouching tools you may need, as well as image layers, filters and more.

3) For non-technical people, kids and novices the Open Pixlr-o-Matic offers a perfect solution by integrating all of the key basic functions in an attractive and much simplified interface.

There is also a free mobile version both for Android and one for iPhone/iPad.

Free to use. No regsitration required.

Try it out now: http://pixlr.com/

Related tools: Picmonkey

Pics.io is free online 32-bit basic photo editor that works also with very large images. It runs in your browser, is fast and you can see edits and adjustments in real time.

Image editing features include cropping, rotation, bright/contr, saturation, curves, invert, temperature and a few effects.

You can open any .jpg, .bmp and .png image and save your edited work in .png.

Key strengths for Pics.io are speed, extreme ease of use, and a thin command set useful for all basic image editing work. 

No need to register, download or login. It works instantly.

Free to use. 

Try it out now: http://edit.pics.io/