See every size WordPress actually generated for an image
Image Sizes List adds a panel to every image's attachment details showing exactly which sizes exist for that file, with the dimensions, a direct link, and a one-click copy button for each.
- Shows only sizes that actually exist for this specific image.
- Works in both the media library modal and the classic edit screen.
- One click opens any size directly; another copies its URL.
- Skipped entirely for non-image attachments.
full2560 × 1856medium300 × 218large1024 × 742thumbnail150 × 150medium_large768 × 557What does Image Sizes List do?
When the image_sizes_list module is active, TOWP_Image_Sizes_List reads an image's actual attachment metadata through wp_get_attachment_metadata() and lists the full size plus every registered sub-size genuinely generated for that specific file, skipping any size WordPress didn't actually produce. Since WordPress core has no single mechanism covering every place an attachment gets opened, the module renders the same panel two different ways: a proper sidebar meta box on the classic attachment edit screen, and a compat-field inside the media library's grid-view modal. Each size gets its real dimensions, a link that opens the file, and a button that copies its URL to the clipboard.
WordPress generates sizes and never says which ones
Because nothing in the default admin lists what actually got generated, finding one specific file often comes down to guesswork.
Every upload produces files nobody sees
WordPress resizes each uploaded image into several registered sizes, but nothing in the default admin shows which of those files actually exist for a specific attachment, or what their dimensions and URLs are.
Finding a size's direct URL means guessing or digging
Without a listing, getting the URL for one particular size means either guessing a filename pattern or digging through the page source of wherever the image happens to be displayed.
Every generated size, listed and one click away
The module shows exactly what WordPress produced for a specific image, with a direct link and a copy button for each one.
Only sizes that actually exist
The list reflects what WordPress genuinely generated for this file, not the theoretical list of every registered size on the site.
A direct link for every size
Open any size's file directly, without guessing at a filename pattern or digging through page source.
The URL, copied in one click
A dedicated copy button puts any size's URL on the clipboard instantly, with a visual confirmation when it works.
Real data, shown wherever it's needed
Every capability below is present in the supplied PHP class, its JS asset and the settings registration.
Reads actual attachment metadata
The list comes from wp_get_attachment_metadata(), reflecting the sizes genuinely generated for this specific file rather than every size the site has registered.
A proper sidebar meta box
On the attachment edit screen (post.php), the panel appears as a standard sidebar meta box, placed the same way as other attachment detail panels.
A compat-field inside the grid view
Since the grid-view modal has no meta-box concept, the panel renders through attachment_fields_to_edit, the mechanism WordPress uses for exactly this case.
Opens the file safely
Each size's link opens in a new tab with noopener and noreferrer, pointing straight at that size's actual file.
One click, instant feedback
A dedicated button copies the size's URL using the Clipboard API, with a temporary checkmark confirming the copy succeeded.
No empty panel for PDFs or documents
The panel never appears for anything that isn't an image, since a non-image attachment would never have sizes to list.
Where seeing every size helps most
The module supports anyone who needs to know exactly what WordPress produced for a given image.
Grabbing a specific size's URL for custom code
Copy the exact URL for a size needed in a template, a custom block, or an email, without hunting for it manually.
Checking whether a size actually generated correctly
Confirm a specific sub-size exists and has the expected dimensions after a theme change or a bulk regenerate.
Editorial teams working with images regularly
Give content editors a quick way to grab the right size URL themselves, without asking a developer each time.
Clarity first, then a faster workflow
The module combines genuine visibility into what WordPress did with a quicker way to actually use that information.
Existing data, read once, displayed
The verified implementation adds no processing beyond reading data WordPress already stored.
Reads existing metadata, no extra processing
The panel reads metadata WordPress already stored at upload time; it doesn't regenerate or recalculate anything.
Loaded only where relevant
Because the panel's own assets only load on screens where an attachment can actually be opened, they never weigh down other admin pages.
Skipped for anything that isn't an image
An early check exits before any processing for non-image attachments, avoiding wasted work on files that would never have sizes to show.
Read-only, by design
The code only displays existing data and never touches files, permissions, or settings.
Read-only by design
The entire panel only displays existing data; it doesn't accept input, modify files, or change any setting.
Safe external link attributes
Every view link includes noopener and noreferrer, the same security-conscious defaults recommended for any link opening in a new tab.
Administrator-only configuration
Only an administrator with access to TheOneWP settings can enable or disable the module itself.
No effect on file storage or permissions
The module doesn't change how files are stored, who can access them, or any aspect of media library permissions.
Built around every native WordPress attachment display mechanism
The supplied code integrates through APIs present in WordPress core; this page makes no compatibility claim beyond the verified implementation.
add_meta_boxes_attachment
The hook WordPress fires specifically for registering meta boxes on the attachment edit screen.
attachment_fields_to_edit
The filter WordPress core itself uses to add custom fields inside the media library's attachment details panel.
wp_enqueue_media
The action that fires wherever WordPress loads its JS media modal, used here to guarantee the panel's assets load alongside it.
TheOneWP versus common alternatives
Compare the verified Image Sizes List implementation with manually inspecting file URLs.
| Capability | TheOneWP Image Sizes List | Other common solutions |
|---|---|---|
| Listing actually-generated sizes | Reads real per-file metadata, not a registered-sizes list | Often shows every registered size, whether it exists or not |
| Coverage across admin screens | Works in both the modal and the classic edit screen | Frequently limited to just one context |
| Getting a size's URL | A direct link and a one-click copy button | Usually requires digging through page source |
| Non-image handling | Silently skipped, no empty panel | Can show a blank or broken panel for non-images |
| Administration | One toggle, nothing else to configure | Requires a dedicated plugin or manual inspection |
Find any size's URL in four steps
The panel appears automatically once enabled; there's nothing further to set up per image.
Enable Image Sizes List
Activate the module from the TheOneWP Content settings tab.
Open any image's attachment details
Click an image in the media library grid, or open its classic edit screen.
Review the sizes actually generated
Check the Image Sizes panel to see every size that exists for that specific file.
Open or copy any size's URL
Use the view button to open a size directly, or the copy button to grab its URL for use elsewhere.
A quick check worth building into the workflow
The panel earns its place most clearly right after a change that affects image generation.
Check sizes after a bulk image regenerate
Use the panel to confirm sizes actually regenerated correctly for a sample of images after a theme or plugin change.
Copy URLs instead of retyping them
The copy button avoids typos that can happen when reconstructing a size's URL by hand.
Use it to spot missing sizes
If an expected size doesn't appear in the list, then that size genuinely wasn't generated for that file.
Share it with content editors
Editors who need a specific image size for external use can grab the URL themselves without involving a developer.
Avoid assumptions the panel itself corrects
The panel's whole purpose is to replace assumptions with what actually exists.
Assuming every registered size will always appear
The panel only lists sizes that were actually generated for that specific file; a size can be legitimately absent for a given image.
Not checking both admin contexts
A workflow that only opens attachments from the classic screen might not realize the same panel also appears in the media library modal.
Expecting the panel on non-image files
The panel never appears for PDFs, documents or other non-image attachments, since they never have image sizes to list.
Image Sizes List FAQ
These answers come directly from the verified class, its JS asset and the settings registration.
What does Image Sizes List do?
It adds a panel to an image's attachment details listing every size actually generated for that file, with its dimensions, a direct link, and a copy-to-clipboard button.
Does this show every size registered on the site, or just what exists for this image?
Only what genuinely exists for that specific file; a size the site has registered but that wasn't generated for this particular image won't appear.
Where does this panel appear?
In two places: a sidebar meta box on the classic attachment edit screen, and inside the media library's grid-view modal.
Why does it need two different display methods?
Because WordPress core has no single mechanism that covers both the classic edit screen and the grid-view modal, the module uses the correct native mechanism for each.
Does this work for PDFs or other non-image files?
No. The panel only appears for image attachments, since non-image files never have generated sizes to list.
How does the copy button work?
It uses the browser's Clipboard API to copy the size's URL, with a brief visual confirmation when the copy succeeds.
Does opening a size's link modify or download the file?
No. It simply opens the file's existing URL in a new tab, the same as clicking any other link.
Can this help me find a size that failed to generate?
Yes. If an expected size is missing from the list, then that size genuinely wasn't produced for that specific image.
Does this change how WordPress generates image sizes?
No. The module only displays existing metadata; it doesn't affect image generation in any way.
Who can enable or disable this module?
Only an administrator with access to the TheOneWP settings screen.
Stop guessing which image sizes actually exist.See every one, with a link and a copy button.
Use Image Sizes List to see exactly what WordPress generated for any image, with a direct link and a one-click copy for each size.