Make Filename Lowercase
Sets uploaded media filename to lowercase.
Use with caution
Make Filename Lowercase works, but test it on a staging site before relying on it in 2026. It runs on 1K+ sites, is rated 4.8/5 and was last updated 1 year ago, and scores 42/100 on our health check.
- Very few reviews so far
- No update in over a year
- Only tested up to WordPress 6.8 (latest is 7.1)
How does it stack up?
Side-by-side on installs, updates, ratings & support
Daily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where Make Filename Lowercase stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| filename | #5 |
| lowercase | #1 |
| media | >100 |
| strtolower | #1 |
| upload | >100 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 4.8 from 4 reviews
About Make Filename Lowercase
From the official readme · v1.0.2Description
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.
Installation
- Download the plugin and unzip it.
- Upload the folder /make-filename-lowercase to your /wp-content/plugins/ folder.
- Activate the plugin from your WordPress admin panel.
- Installation finished.
Frequently asked questions
Why was this plugin created?
This plugin evolved from a client requirement that all uploaded media filenames contain no uppercase characters.
Why did you release this plugin?
It was useful to me and I wanted to work through the process of releasing a WordPress plugin.
Why shouldn’t this just be added to a theme’s functions.php file?
Upgradeability, portability, backwards compatibility, and other *abilities. If for some reason this function were in need of customization due to a WordPress version upgrade, the plugin will be centrally responsible for releasing the fix as opposed to updating the theme(s).
Changelog
1.0.2
- moved plugin screenshots to assets directory
- added cool header banner for plugin repository
1.0.1
- Tested for 3.3.1
1.0.0
- Initial release
Screenshots
For developers
Is this your plugin? Show off the numbers.
Add a live badge to your site, docs or GitHub README. It updates on its own — no account needed.
Best Make Filename Lowercase alternatives
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FAQ
Make Filename Lowercase: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Sep 28, 2026
Is Make Filename Lowercase free?
Yes. Make Filename Lowercase is free to download and use from the official WordPress.org plugin directory.
Is Make Filename Lowercase safe to use in 2026?
Make Filename Lowercase works, but test it on a staging site before relying on it in 2026. It runs on 1K+ sites, is rated 4.8/5 and was last updated 1 year ago, and scores 42/100 on our health check.
How many websites use Make Filename Lowercase?
Make Filename Lowercase is active on 1K+ WordPress websites and has been downloaded 10,229 times since it launched in February 2011. It was downloaded 216 times in the last 30 days.
Does Make Filename Lowercase work with WordPress 7.1?
Make Filename Lowercase is officially tested up to WordPress 6.8.10, while the latest release is 7.1.2. It may still work, but try it on a staging site first.
When was Make Filename Lowercase last updated?
The latest version, 1.0.2, was released on September 3, 2025 (1 year ago).
Who makes Make Filename Lowercase?
Make Filename Lowercase is developed and maintained by ereckers.
What are the best alternatives to Make Filename Lowercase?
The most popular alternatives to Make Filename Lowercase are Filenames to latin (9K+ installs), rus to lat advanced (7K+ installs) and Clean Filenames (3K+ installs).
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