In Browser - Image Resizer to fit 1920x1200 box

Drag or open image. It is resized and a border is added.

NOTE: Portrait Images - check Orientation. This does not rotate. Crop with Photos

large x1 ( 1920x1200 ) mid x0.5 small x0.25 effect

- or drag image on top of the button.

Resized image - Right click and copy to email

In Browser - Image NOT uploaded to server.

https://developer.mozilla.org/en-US/docs/Web/CSS/filter-function/blur
https://developer.mozilla.org/en-US/docs/Web/CSS/filter-function/grayscale
https://developer.mozilla.org/en-US/docs/Web/CSS/filter#invert 
https://developer.mozilla.org/en-US/docs/Web/CSS/image-orientation