Why are my thumbnails not regenerating in WordPress?
If your new WordPress theme has defined different image ratios and/or image dimensions for the thumbnails than your previous WordPress theme, it might happen that your images are not being displayed consistent in size on your website. To fix this issue you need to regenerate the thumbnails on your site.
How does the default image size work in WordPress?
Every time you upload an image into the WordPress media library, these are the additional image size options WordPress creates by default: If your theme specifies additional image sizes, WordPress creates those as well. WordPress also preserves the original size you upload and names it Full as in full-size.
How does force regenerate thumbnails differ from other plugins?
One of the main differences in comparison to the other plugin is that Force Regenerate Thumbnails allows you to delete all old images sizes and regenerate the thumbnails for your image attachments. What if regenerating thumbnails does not help?
What’s the minimum size for a thumbnail in WordPress?
For example, if you are using our popular MH Magazine WordPress theme and the large slider widget on the front page, the recommended minimum image size to upload is at least 1030 x 438px. If you upload images with at least that size, WordPress will be able to generate all thumbnails as expected (including the large thumbnail for the slider).
What happens when you regenerate image size in WordPress?
Regenerating images sizes does not affect your original upload. It creates additional copies of images in the newly defined sizes. It also does not delete previously created image sizes. You can delete the sizes if you are sure that you haven’t used those sizes anywhere on your website.
How to generate new image sizes in WordPress?
To generate images in newly defined image sizes, install and activate the Regenerate Thumbnails plugin. After activating the plugin, go to Tools » Regen. Thumbnails. Pressing the regenerate thumbnail button will start generating new image sizes defined by your theme or in Settings » Media page.