Does SlashImage resize my large images?

Only if you turn it on. SlashImage can scale an oversized original down to a maximum size before optimizing it, but the feature is off until you enable Resize large images in the settings.

Turn on resizing

1. Go to Media > SlashImage and scroll to the Resize section.
2. Switch on Resize large images ("Scale down images that are bigger than the size you set.").
3. Set Maximum dimensions - a maximum width and height in pixels. The default is 2560 by 2560.
4. Click Save changes.

What resizing does

• It only touches the full-size original. The thumbnail, medium, and large copies WordPress creates are untouched.
• It keeps the image's proportions. The image is fitted inside your maximum width and height, so neither side exceeds your limit and nothing is stretched.

What can go wrong

• You want the full-size original back. Restoring an image puts its original dimensions back, as long as you kept a backup. See How do I restore my original images?.

See also

• How do I restore my original images?
• How do I exclude image sizes I don't use?
• Where are my image backups stored?