How do I re-optimize an image?

In your Media Library list view, hover over the image and click Re-optimize with SlashImage. SlashImage restores the original from its backup first, then optimizes it again with your current settings, so an image is never compressed on top of an already-compressed version.

Prerequisites

• A backup of the original still exists, because re-optimizing works from that backup. If backups were off or deleted, see Where are my image backups stored?.

Re-optimize one image

1. Open your Media Library in list view and hover over the image.
2. Click Re-optimize with SlashImage in the row actions.
3. The image is queued and reprocessed with your current settings.

On the attachment edit screen you can instead use Re-optimize as: to re-run that one image in a specific mode (Lossy, Glossy, or Lossless). If the last attempt failed rather than succeeded, the button reads Retry optimization.

Re-optimize selected images

1. Open your Media Library in list view and tick the checkbox next to each image you want.
2. Open the Bulk actions dropdown above the list and choose Optimize with SlashImage.
3. Click Apply.

The selected images are queued and reprocessed with your current settings.

Re-optimize every image at once

Both flows give the same result - pick the one that suits you.

Default - re-optimize directly:

1. Go to Media > Bulk Optimize.
2. Tick Re-optimize the [N] already-optimized images. Its help text reads "Reprocesses them with your current compression settings. Uses additional credits."
3. Click Start Bulk Optimization.

SlashImage restores each image from its backup before reprocessing it, so nothing is compressed on top of an already-compressed version.

Optional - restore originals first, then re-optimize:

Use this if you want to see your originals back in place before running new settings.

1. Go to Media > SlashImage, open the Settings tab, scroll to the Danger Zone, and click Restore all.
2. Go to Media > Bulk Optimize and click Start Bulk Optimization (without the re-optimize checkbox - your images are now unoptimized, so the bulk run picks them all up normally).

See How do I optimize images I already uploaded? for the full Bulk Optimize walkthrough, including pausing, resuming, and the credit cost.

See also

• How do I restore my original images?
• Where are my image backups stored?
• How do I optimize images I already uploaded?