This plugin allows you to change the absolute url to relative url format.

Leandro Keene Manalon

File Relative Path is a Word Press plugin used to convert relative path’s(url) instead of absolute. All your file tags inside the Post (Post Type), Pages, Archive’s like images, audio, video and also iframe was converted.
NOTE: Please always read the changelog for the plugin updates.
Plugin Options
Default Functions 
 Once you activate the plugin they already have a Default functionality. All your images paths(url) inside the Post, Pages and Archive’s was converted to relative instead of absolute (url).

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