Here is a free online tool known as Change Images.
It lets you:
* crop an image,
* convert an image from format to another
* re-size an image
* change the effect of an image (shadow, flips, shear, texture, grey scale, mosaic, waves, sephia, rotate, swirl, oil paint)
* put your image into a photo frame
I tried this online image editing tool and it was a breeze. No sign up is required.
You can use this online image editing tool to build your website, develop your blog, create a business card or even a greeting card and create a logo for your brand.