---
title: "Introduction"
manual: "Filefix"
version: "main"
permalink: "https://docs.typo3.org/permalink/anubit/filefix:introduction@main"
source: "Introduction/Index.rst"
rendered: "2026-10-16T12:43:55+00:00"
---

# Introduction {#introduction}

## What does it do? {#what-it-does}

**Find it. Fix it. Never rm -rf a client's fileadmin by accident.**

Filefix is a TYPO3 backend extension that keeps `fileadmin` honest.
Real-world `fileadmin` folders rot in a few specific ways:

1.  **Content/extension mismatches.** Someone renames a `.png` to
    `.jpg`, or an old CMS re-exported a Photoshop file as `.jpg`
    without converting it. The browser silently mis-renders it, or breaks
    entirely.
1.  **Unused files pile up.** Thousands of uploads that no page, no content
    element and no FlexForm references anymore.
1.  **The same file, uploaded again and again.** Identical content under
    different names and folders, each copy taking its own disk space and
    metadata.
1.  **Camera-original images.** 6000 px wide, 8 MB JPEGs uploaded straight from
    the camera, for a slot that never renders wider than 1900 px.

Filefix addresses all of these with purpose-built tools that live where editors
already work:

-   [MIME Fix](https://docs.typo3.org/permalink/anubit/filefix:usage-mimefix@main) inside the native file list
-   [File Cleanup](https://docs.typo3.org/permalink/anubit/filefix:usage-cleanup@main) for unreferenced files
-   [Duplicate report](https://docs.typo3.org/permalink/anubit/filefix:usage-duplicates@main) with a deep usage check
-   [Oversized images](https://docs.typo3.org/permalink/anubit/filefix:usage-oversized@main) report with in-place resize
-   [Dashboard widgets](https://docs.typo3.org/permalink/anubit/filefix:usage-dashboard@main) showing unused files and space