How to Crop an Image without Losing Quality?
The Easy Image Resizer is a 3 step free online image optimization tool, which allows you to select, crop and resize an image or picture of your choice, any time and from anywhere.
It supports various image types such as a png, jgeg or a bmp (bitmap), with different sizes.
You can crop png images for free.
After loading the image, it shows how much the image is optimized or compressed. See here.
Is this tool Responsive?
Yes it is. The responsive design of this tool makes it perfect for mobile users to quickly and smoothly crop, resize or simply convert images using any device of any size. All it requires, is a browser.
Once resized, you can either download the image on your computer, or instantly share the optimized image with your friends on social networking sites. It is one of the fastest and simplest image resizing tools available on the web today.
The 3 steps (to crop an image)...
1) Select an image: You can select or drag and drop a png, jpg (or jpeg) or a bmp image or picture from your device.
2) Crop the image: The second step allows you to crop an image or a picture in seconds. This feature is optional, however useful when you want to crop the image. You can skip cropping and go to the 3rd step.
3) Resize the image: The 3rd and last step has 2 more features.
  i) You can scale down the image from its original size. For example, you can scale down an image to 75% or 50% from its original size or simply enter the values like the width and height of your choice and it will scale the image accordingly, without losing the quality (in most cases, I should be honest with this).
  ii) You'll also have an option to convert image into jpg, jpeg, png or bmp. For example, you can convert a png image to a jpg etc. Or, you can keep the original format.