Pete

Note: Obsolete since WordPress 4.4
<a href="https://core.trac.wordpress.org/ticket/32230" rel="nofollow ugc">This feature has been added into the core of WordPress 4.4</a>. You can now export your attachments by going to Tools->Export and select ‘Media’ as the export type.
Original Description
WP Attachment Export allows you to export your media library into a WordPress eXtended RSS or WXR file. You can then use the Tools->Import function in another WordPress installation to import the media library.
<h4>Issues / Bug reporting</h4>
Found a bug? Please use the issue tracker at <a href="https://github.com/thehelvetian/wp-attachment-export/issues" rel="nofollow ugc">https://github.com/thehelvetian/wp-attachment-export/issues</a>
<h3>Usage</h3>
User <a href="https://wordpress.org/support/profile/philho" rel="ugc">PhiLho</a> has put together a good summary on how to use the plugin at <a href="https://wordpress.org/support/topic/good-but-could-use-more-explanations" rel="ugc">https://wordpress.org/support/topic/good-but-could-use-more-explanations</a>. Thanks PhiLho!

WP Attachment Export

works perfectly.

Exports only posts of type 'attachment', i.e. your media library

wowpress.host

Fix Media Library fixes inconsistency between wp-content/uploads folder and 
database. 
Fixes corrupted Media Library database records. 
Designed to run smoothly against huge Media Libraries containing hundreds of thousands of images.
Useful when:
<ul>
<li>Really old database is used and there are a lot of problems with Media Library found</li>
<li>New thumbnail sizes are registered</li>
<li>Some thumbnail sizes are not used anymore (theme change, upgrade), but image files are still exists</li>
<li>There are Media Library entries present pointing to image files that don’t exist anymore</li>
<li>Some entries in Media Library are not displayed, while image files are present (_wp_attachment_metadata meta field corrupted)</li>
<li>There are a lot of images in wp-content/uploads folder that are no longer used</li>
<li>There are duplicate attachments pointing to the same image file</li>
<li>Images are used by website, but you can’t find them in Media Library</li>
<li>You want to update attachments GUID fields containing old/staging urls</li>
<li>Detects major database corruptions affecting media library functionality</li>
</ul>
At <a href="https://wowpress.host/" rel="nofollow ugc">WowPress.host</a> company we regularly migrate very old databases and clean it up to make sure website using it is running smoothly. Those databases have all different kinds of inconsistencies collected during years or even decades of usage, and Media Library is the most common problematic piece of data here. 
That plugin helps to solve most common problems related to Media Library data.
We use a lot of open-source tools in our work, and therefore decided publish our own tools so that those can be used by the community too.
<h4>Need Help? Found A Bug? Want To Contribute Code?</h4>
Support for this plugin is provided via the <a href="https://wordpress.org/support/plugin/wow-media-library-fix" rel="ugc">WordPress.org forums</a>.
The source code for this plugin is available on <a href="https://github.com/wowpress-host/wow-media-library-fix" rel="nofollow ugc">GitHub</a>.
Paid support at <a href="https://wowpress.host/professional-services/" rel="nofollow ugc">WowPress.host</a>.

Fix Media Library

This plugin is legitimate.  Works perfectly.  Of course, with everything you do in WP related to the database and files; you should ALWAYS pull your own backups.  However, I had no need to use them.  It worked the first time and did a miracle for a client's site I was working on.

Amazing. Flawless.

Fix Media Library inconsistency between database and wp-content/uploads folder contents. Unused image files, broken media library entries, missing att …

WP Attachment Export vs Fix Media Library