Plugin Directory

Image Source Control Lite – Show Image Credits and Captions

Image Source Control Lite – Show Image Credits and Captions


Are you concerned about being held liable for violating copyright law and would like to start crediting owners properly?

Do you want to give back to photographers and illustrators by adding image credits, so they are rightfully attributed?

Or are you a creator yourself and want to show information on the picture licenses for your image gallery under which publishers can use or purchase your work?

Image Source Control is your go-to solution when it comes to handling copyright-protected photos and illustrations.

Image Credit layouts

Choose between different credit displays:

  • List all image sources below the content of a specific page or place the list manually
  • Show an image caption overlay above or below the image
  • Embed a complete image credit list with thumbnails on your website

Frontend Features

  • Display image credits in the content, for image galleries, images added by shortcodes, and featured images
  • … see more listed under Premium features below
  • Define the layout and position of the caption overlay
  • Show the image source fully, or only on click or mouseover
  • Attach the Per-page list automatically, by using a shortcode, or with a PHP function
  • Display image sources on archive pages
  • Link to the copyright holder and include a link to the image license

Backend Features

  • Add credits for any image file uploaded to the Media library
  • Dedicated image source fields for the following blocks: Image, Cover Image, Featured Image, Media & Text
  • Quickly assign a centrally defined source to any image and choose three options: hide image sources for these images, show a specific source (e.g., your name), or the uploader’s name
  • Warn about missing image sources
  • Manage, display, and link available licenses

Featured Image Caption

ISC Lite works for Featured Images. By default, you will see the image credits options in the media library and the featured image options in the block editor.

The featured image caption shows in the Per-page list with all other image sources on the page.

Check out the premium features to display the image caption overlay for featured images.

Premium Features

Check out all features of Image Source Control.

  • List credits for images outside the content
  • Add multiple links to the source string
  • Manage image credits for images hosted outside the Media Library
  • Handle images without file extensions
  • Bulk-edit image copyright information in the media library
  • Show the standard picture credit for all images without a selected source
  • Display IPTC copyright metadata in the backend and automatically as a standard source in the frontend
  • Show the full text only after a click or on mouseover on the caption overlay
  • Choose which data is displayed in the Global List
  • List only images with a proper source in the Global List
  • Show image sources for Elementor background images, images in Kadence Blocks Galleries, and Kadence Related Content Carousel
  • Developer options to show overlay captions for CSS background images
  • Support for background images of the Group block
  • Exclude certain images from showing the overlay by adding the isc-disable-overlay class
  • Unused Images (see below)
  • Personal email support

See Pricing.

Unused Images

Premium media cleaner features to remove unused images safely.

– Go to Media > Unused Images to see and remove unused images
– Run an additional deep check to see if images are used in widgets, meta fields, or options
– Bulk delete unused images
– Filter the list by various states

See Pricing.


Take a look at the Image Source Control Documentation.

Find a list of missing images sources and other debug tools under Media > Image sources

You can choose to display image sources below the post content or as a small caption overlay above your images. Just visit the settings page of the plugin to enable those options.

Manually included image sources on pages/posts

You can add the Per-page list manually to pages or posts via the shortcode [isc_list] in your content editor or a text widget.

Use [isc_list id="123"] to show the list of any post or page.

Use the PHP code <?php if( function_exists('isc_list') ) { isc_list(); } ?> within your template files.

List all image sources

You can add a paginated list with ALL attachments and sources attached to posts and pages—the Global list—using the shortcode [isc_list_all].

Use [isc_list_all per_page="25"] to show only a limited number of images per page.

Use [isc_list_all included="all"] to show all attachments in the list, including those not explicitly attached to a post.

The plugin searches your post content and thumbnail for images (attachments) and lists them if you included at least the image source or marked it to use the default image source.

Remove “nofollow” from all source links

In order to remove “nofollow” from source links, follow the instructions in our documentation.


  • Display image attribution captions as an overlay above the image
  • Display a list of all images of your site and their sources on a dedicated page
  • Edit image source settings in the Image block
  • Bulk-editing image sources in the Media Library
  • Unused Images – Media Cleaner feature to safely remove unused images
  • Customizing the display of image captions as an overlay
  • Customizing the list of image sources displayed under posts
  • Customizing the global list of image sources
  • Manage image usage licenses


This section describes how to install the plugin and get it working.


  1. Upload image-source-control-isc.zip through the ‘Plugin’ menu in your WordPress backend
  2. Activate the plugin
  3. Visit Settings > Image Sources for the main settings

See the Instructions section here.


أڥريل 3, 2024 1 reply
The plugin author has been super helpful in answering all of our questions and checking in on how things are going. The plugin offers lots of excellent features and works well.
جونڥي 16, 2024 1 reply
If you are looking for a plugin to manage your image sources – look no further. We have this plugin on many sites running for years without issues. The best thing: The excellent support of Thomas – even for the free version. Thank you! A+++
نوفمبر 7, 2022 1 reply
Very helpful plugin which saves us a lot of time every day!
Read all 39 reviews

Contributors & Developers

“Image Source Control Lite – Show Image Credits and Captions” is open source software. The following people have contributed to this plugin.


“Image Source Control Lite – Show Image Credits and Captions” has been translated into 5 locales. Thank you to the translators for their contributions.

Translate “Image Source Control Lite – Show Image Credits and Captions” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • Fix: a wrong format of the isc_post_images post meta value could cause a PHP error


  • Feature: (Pro) support for background images added by the WP Bakery page builder
  • Improvement: allow to remove individual entries from the image-posts and post-images indices on the Tools page
  • Improvement: include all page types in the post-image index list, not only posts
  • Dev: added the isc_add_sources_to_content_ignore_post_images_index filter to allow users to manually ignore the post-images index on all page views in case another plugin or page builder indexes the wrong content
  • Dev: speed up the query for images without sources
  • Dev: added debug log entries and log parameters


  • Fix: a fatal error prevented the settings page from loading fully when Elementor was enabled
  • Fix: (Pro) license activations on subsites on a multisite didn’t work reliably


  • Feature: (Pro) two new overlay behaviors: show the full caption only after a click or on mouseover
  • Improvement: rearranged the settings page for more clarity
  • Improvement: renamed the “pre-text” option for overlay text to “prefix”
  • Improvement: added a button to close the newsletter signup form
  • Dev: rewritten the code that renders and handles the settings page


  • Note about WordPress 6.5: The lightbox feature in WordPress core changed significantly and no longer supports image source overlays out of the box. I am working on a solution.
  • Improvement: (Pro) removed the hotfix for Elementor’s Image Optimization feature after they fixed the issue on their end
  • Improvement: (Pro) added PHP translation files as supported in WP 6.5
  • Fix: (Pro) the bulk edit fields could show a wrong default value in the backend for certain options
  • Dev: (Pro) added the isc_unused_images_per_page filter to adjust the number of items per page in the Unused Images list
  • Dev: adjusted the URL sanitization check to allow special characters in image URLs, like “©”
  • Dev: prevent a PHP deprecation warning when the isc_public_global_list_view_path filter returns an expected value
  • Dev: remove cached options in Standard_Source class to prevent caching of old options


  • Improvement: (Pro) the bulk edit options are visually more compact now
  • Improvement: (Pro) Elementor: disable the Image Optimization module in Elementor when checking images in the whole content. This module is known for conflicting with many plugins and in review by the Elementor team
  • Improvement: (Pro) Avada: recognize the data-preload-img attribute for Avada background images
  • Improvement: (Pro) add a link to some words in the image source, but not to words at the end of the caption
  • Improvement: show a feedback form when disabling the plugin
  • Fix: (Pro) comma-separated URLs in the bulk edit fields were wrongly sanitized
  • Fix: the image source fields in the media edit page disappeared when saving the page
  • Fix: labels in the block editor were not translated
  • Fix: newsletter subscription returned an error for subscribed users
  • Dev: ISC_Block_Options threw a PHP warning due to an early hook
  • Dev: introduced ISC\User to gather user-based helper functions
  • Dev: add an output buffer handle to better analyze a conflict with other output buffers


  • Fix: image source fields for image blocks in the site editor threw a JavaScript error
  • Dev: resolved a PHP 8.2 encoding warning
  • Dev: improved code style in the caption frontend script


  • Improvement: (Pro) the deep check for image usages looks for attachment IDs in options, e.g., to find site logos
  • Fix: unused images table layout was shifted for non-English backends
  • Dev: added a helper class for utility functions
  • Dev: use a custom unserialize function to prevent object injection


  • Feature: (Pro) show caption overlay for Avada Builder background images
  • Improvement: the check for unused images became faster and more reliable by excluding non-images
  • Improvement: updated the uninstall script to remove recently added data when the plugin is deleted
  • Improvement: (Pro) allow editors to use the bulk edit feature for image sources
  • Improvement: (Pro) introduced pagination for the list of unused images
  • Improvement: (Pro) bulk selecting enabled for checking unused images and deleting them
  • Improvement: (Pro) introduced various filters to the list of unused images
  • Fix: a possible empty post ID for the excerpt block caused a PHP warning
  • Fix: (Pro) a PHP warning appeared when an unused image was associated with a deleted post
  • Dev: introducing the ISC\Unused_Images class with improvements to unused images code
  • Dev: (Pro) use WP_List_Table when displaying the Unused Images list


  • Improvement: show a hint about where to edit image sources in the block editor, depending on The Block Options settings
  • Fix: the Global List didn’t show any images when Miscellaneous settings > Standard source > Exclude from lists was enabled


  • Feature (Pro): show the IPTC copyright or credit meta information as a standard source. See this blog post
  • Feature (Pro): authors now see the IPTC copyright and credit meta information in the backend and can copy it to the image source field with one click
  • Feature (Pro): the standard source appears as a placeholder in the image source field in media list overview, when no individual source is entered
  • Fix: pre-select the “custom text” standard source option when the plugin options weren’t saved yet to reflect how this state behaves in the frontend
  • Dev: added an autoloader for plugin classes
  • Dev: move all features related to the standard source into ISC\Standard_Source
  • Dev: replace the isc_raw_attachment_use_standard_source and isc_public_attachment_use_standard_source with the isc_use_standard_source_for_attachment filter
  • Dev: added the isc_can_load filter to allow developers to disable ISC on certain pages in the frontend
  • Dev: added the isc_force_block_options filter hook to enable ISC fields in the block options and media modal in the block editor at the same time


  • Improvement: create a unique name for the log file
  • Improvement: show the overlay caption in the bottom left in the lightbox (added in WordPress 6.4) where the current position doesn’t show up



  • Feature (Pro): Unused Images feature to help clean up the media library
  • Improvement: combine images without sources and with empty sources in the “Images without sources” list on the Tools page instead of having two separate tables


  • Improvement: (Pro) Support for dynamic background images in Elementor templates, e.g., featured images
  • Improvement: (Pro) Disable links in overlays, e.g., when Elementor assigns a background image to <a> tags
  • Fix: The <style> block detection could sometimes cover multiple blocks and add the caption only to the last one
  • Dev: Added argument to render_image_source_string() that allows to disable links in the caption output