Get the most out of CropToFit.
You can use wildcards to specify an unconstrained dimension.
For example: Let's say that the image should be 60 pixels high, but the width is flexible
You would specify that as
*x60
Wildcards can be specified as an empty string, the asterix * or if you want to be very clear, you can use the string ANY
You would specify that as
ANYx60
Many websites and WordPress themes specify recommended dimensions:
Examples: recommended size 263x53px, 263px x 53px etc.
You don't need to parse out those dimensions and enter them into the dimension box. You can simply paste the dimension string and CropToFit will automatically parse out the dimensions.
(You can also suggest that they provide preset-links to CropToFit!)
SVGs (Scalable Vector Graphics) have the advantage that they will look great at any scale. Adobe Illustrator supports working with SVGs natively. Many browsers support SVGs as well. However, many don't. You can crop an SVG to any dimensions you wish with CropToFit and the resulting crop will look sharp.