Lowercase file names for uploads

Uploaded files get lowercase names (“Photo-Beach.JPG” becomes “photo-beach.jpg”), so addresses never break on servers that care about case.

Type PHP
Runs Everywhere (runs as WordPress loads)
Category Media
Tested with WordPress 7.1

PHP

<?php

add_filter(
	'sanitize_file_name',
	static fn( $name ) => function_exists( 'mb_strtolower' ) ? mb_strtolower( $name ) : strtolower( $name ),
	20
);

In these packs

Images and media: Sharper, lighter images, tidier uploads and a more useful media library.

Install it in one click

It's already in the Snipfire plugin's library. Enter your site's address and it opens there, ready to install. It arrives switched off, and Snipfire checks the code and test-loads your site before you switch it on.

Needs Snipfire on that site and you logged in as an administrator. Your address stays in this browser; we don't see it. Get Snipfire free

Or add it by hand

Click + New and choose PHP.
Paste the code and give it a name.
Where: Everywhere (runs as WordPress loads).
Save and switch it on.

Works in any snippet plugin, or a child theme's functions.php. Without the safety net, though.

In these packs

More Media snippets

Move your snippets over this afternoon.