You are able to resize or crop images before you download them from Dash.
You have three different options when downloading:
Download using a preset size, which can be either a resize or a crop, that has been preconfigured by your Admin users. See this article for more on preset sizes.
Create your own crop at the point of download
Create your own resize at the point of download
Cropping an image when downloading
Here's how to crop an image manually when you download (as opposed to using a Preset Size):
On any image asset, select the Download button, then click "Custom download" and then "crop".
On the next screen, you can choose the crop to apply to your image
Drag the corners and edges of the crop selector to choose the size of your crop
Click inside the crop selector to re-position the crop to your liking
The resulting dimensions of the asset are shown in the bottom-right corner.
When you're ready, click "Confirm crop", and you'll see a preview of your image in its new dimensions. If you would like to resize the image at this point, you can do so, and then click Download.
Resizing an image when downloading
To resize an image before you download it, choose "Custom crop" from the Download menu, and you will see the resizing sliders.
Resizing preserves the image's aspect ratio, so adjusting one of the dimensions will adjust the other. To change an image's aspect ratio you may choose to crop the image instead (see above).