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Permalinks in WordPress should always be unique. WordPress doesn't allow different Posts or Pages to have the same URL. Because of that, WordPress will insert a suffix number at the end of the actual Post/Page URL.

First Page URL: <code>https://my-domain.com/my-page-name</code>

Second Page URL: <code>https://my-domain.com/my-page-name-2</code>

- First Page URL: <code>https://my-domain.com/my-page-name</code>
- Second Page URL: <code>https://my-domain.com/my-page-name-2</code>

If there are one or more Posts/Pages with the same <code>slug</code> WordPress will add a numbered suffix after the actual Post/Page URL.

That indicates that at least one Post or at least one Page uses the same <code>slug</code>.

Definition: A <code>slug</code> is part of the URL added after the domain name. WordPress automatically creates the <code>slug</code> based on the Post/Page title.

Remove the suffix number from the page's/post's URL

Ensure that there is no other published post or page with the same <code>slug</code>

Check the Trash Page and ensure no post or page uses the same <code>slug</code>

Ensure that no image that is uploaded to the Media Library (WordPress →Media Library) uses the same <code>name</code> as the Post/Page's name that displays the suffix number

1. Ensure that there is no other published post or page with the same <code>slug</code>
2. Check the Trash Page and ensure no post or page uses the same <code>slug</code>
3. Ensure that no image that is uploaded to the Media Library (WordPress →Media Library) uses the same <code>name</code> as the Post/Page's name that displays the suffix number

If any of the above is true, set unique names for those Pages/Posts. 

Pro tip: Each image that is uploaded should be named to describe the page/area where it has been uploaded. To avoid creating suffix numbers, add the <code>-img</code> after the actual image name.

<code>about-us.jpg</code> used on the About Us page should be renamed to <code>about-us-img.jpg</code>

How to change the <code>slug</code> of an existing page/post

From Dashboard → Pages load the page in question

From the Right Sidebar, click on the URL of the page

1. From Dashboard → Pages load the page in question
2. From the Right Sidebar, click on the URL of the page
 
 Edit the page slug name
 
3. Manually change the <code>slug</code>
 
 Change the Page slug name

Repeat this process for all pages or posts that have the suffix number added.

How to change the name of an image from the Media Library

Go to WordPress Dashboard → Media →Library

Use the Search field to search for the image name

Download the Image file to your local computer by clicking on the Download file link

Change the image name - ensure that the new image name is unique

Upload the image back (with the new name)

If the previous image was used in any of your layouts, replace it with the new image.

1. Go to WordPress Dashboard → Media →Library
2. Use the Search field to search for the image name
3. Click on Edit
 
 Edit the image from Media Library
 
4. Download the Image file to your local computer by clicking on the Download file link
 
 Download the image from Media Library
 
5. Delete the image from your server
 
 Delete the image from Media Library
 
6. Change the image name - ensure that the new image name is unique
7. Upload the image back (with the new name)
8. If the previous image was used in any of your layouts, replace it with the new image.

Remove the suffix number from the page's/post's URL

How to change the slug of an existing page/post

How to change the name of an image from the Media Library

How to change the `slug` of an existing page/post