It automatically renames your media filenames depending on their titles. When files are renamed, the references to it are also updated (posts, pages, custom types and their metadata). If you have the Pro version, this can be done also based on the title of the post (page or any other custom type) the media is attached to.
The Pro users are given a few more features like manual renaming, renaming depending on the post the media is attached to, logging of SQL queries and a few more options. With the Pro, a good process is to actually let the plugin do the renaming automatically (like in the free version) and to do manual renaming for the files that require fine tuning.
For more information about Media File Renamer, check the official page about it: Media File Renamer.
This plugin is a very difficult one to make and to maintain, so I need your help. Happy users are just happy (and often thanks me) but unhappy users easily go on WordPress to write a bad review. So please Review Media File Renamer. Then contact me and I will provide you with a 20% discount coupon 🙂 Thank you.