Albin

With this pluginyou can face two goals:
· File Replace Sometimes you have an image used in several spots (slider, gallery, feature image, …) and if you remove it and upload it again, as it gets a new ID, you will need to select the new one all around but you could forget a place. To avoid it, use this plugin.
· File Rename Sometimes we upload a file as it comes from the mobile camera and later we realize that the file doesn´t have a ver SEO-Friendly name. Here you can rename the file.
None of both functionalities will breake any link where the image is pointed by its ID but this action doesn´t do a Search and Replace along the post entries.

FileRenameReplace

This plugin let the user renaming or replacing files without breaking links.

neoslab

MD5 Media Renamer will automatically rename and convert to lower case your media file during the upload process using PHP time() stamp as prefix and the file name encrypted in MD5() as suffix in order to keep your upload folder clean and organized. More information can be found at : <a href="http://www.natexim.com/wp-rename-file-during-upload/" rel="nofollow ugc">WP Rename file during upload</a>.
** Supported files Image extension **
<ul>
<li>.jpg</li>
<li>.jpeg</li>
<li>.png</li>
<li>.gif</li>
</ul>
** Supported files Document extension **
<ul>
<li>.pdf</li>
<li>.doc</li>
<li>.docx</li>
<li>.ppt </li>
<li>.pptx</li>
<li>.pps</li>
<li>.ppsx</li>
<li>.odt</li>
<li>.xls</li>
<li>.xlsx</li>
</ul>
** Supported files Audio extension **
<ul>
<li>.mp3</li>
<li>.m4a</li>
<li>.ogg</li>
<li>.wav</li>
</ul>
** Supported files Video extension **
<ul>
<li>.mp4</li>
<li>.m4v</li>
<li>.mov</li>
<li>.wmv</li>
<li>.avi</li>
<li>.mpg</li>
<li>.ogv</li>
<li>.3gp</li>
<li>.3g2</li>
</ul>

MD5 Media Renamer

Sanitize and rename automatically media files during upload using PHP time() as prefix and the file name encrypted in MD5() as suffix.

FileRenameReplace vs MD5 Media Renamer