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Make Filename Lowercase

Sets uploaded media filename to lowercase.
Rating
4.8/5
Version
1.0.2
Active installations
1K
Last updated
Sep 3, 2025
Make Filename Lowercase

Sets uploaded media filename to lowercase as filter on sanitize_file_name. Based on post at Stack Overflow asking if there is a way to “Rename files during upload within WordPress 3.0 backend”.

Created for WordPress 3.0.1+ which saves any uploaded media filename (Image, Video, Audio) as lowercase. This effectively changes the name of the file at upload if a user were to upload a file with any uppercase characters.

For instance:

  • MOVIE-FILE.MOV > movie-file.mov
  • Movie-File.wmv > movie-file.wmv
  • ImAgEfILe.gif > imagefile.gif
  • imageFile.JPG > imagefile.jpg
  • ETC > etc

Note: WordPress sets file extension to lowercase. This plugin does a strtolower on the filename.

More Information

Visit the Red Bridge Internet site for more information about Make Filename Lowercase plugin.

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Tested up to
WordPress 6.8.3
This plugin is available for download for your site.