Regenerating Thumbnails

Sometimes, after making a large change to a site such as changing the active theme, you might find that there are some issues with the responsive images. The new theme may have different thumbnail requirements, so in this case you will need to regenerate the thumbnails. You may also need to do this after changing your site's image settings.

This is an automated process accessible by clicking on the Tools option in the left-sidebar and then selecting Regenerate thumbnails. On the next screen, you can review the number of images, the active theme and the thumbnail format. Click the Regenerate button at the top of the screen to begin the process.

Publii creates new thumbnails using your theme's image sizes and your site's image settings. Existing thumbnails are replaced once the new files are ready; your original images stay unchanged. Publii may also prompt you to regenerate thumbnails after changing your theme or image settings.

Note that this process may take some time if you have a large number of images on your site, so please be patient. The screen shows the progress and number of images processed.

You can click Cancel to stop the process. Existing thumbnails are kept for images that have not finished processing. Clicking Regenerate again starts a new run from the beginning.

If some images cannot be processed, they will appear in the Problems list. Click Open log viewer for more details. Once regeneration is complete, preview your site to check the images, then synchronize it to publish the updated thumbnails.