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LMDM Lightbox Image Caption

By nicmare·
Adds a lightbox-only image caption toggle for core Image and Gallery blocks.
Version
1.0.0
Last updated
Jun 15, 2026

WordPress ships with a native Lightbox-Effect for image blocks. This plugin adds one tiny additional option to the core image and gallery blocks: Show Caption.

When the toggle is enabled, the native lightbox receives the current image alt text as a data-img-alt attribute on the enlarged lightbox figure. A small frontend CSS then displays that value as a caption overlay inside the lightbox image.

Please note: The caption text is taken from the image alt attribute.

The toggle is only available when the native Lightbox-Effect is active. If the lightbox is disabled or the image is linked somewhere else, the caption option is disabled as well.

Plugin Features

✔ adds a new toggle Show caption to the core Image block ✔ adds the same toggle to the core Gallery block ✔ the toggle can only be enabled when the native Lightbox-Effect is active ✔ ships with German translation files for the editor toggle ✔ uses the image alt attribute as value for data-img-alt ✔ adds the attribute only to the enlarged image figure in the lightbox ✔ supports galleries by passing the gallery setting to the nested image blocks ✔ outputs the value with a lightweight frontend CSS pseudo element ✔ uses no new block and does not replace the existing Image or Gallery blocks

Freeon paid plans
Tested up to
WordPress 7.0
This plugin is available for download for your site.