---
title: "Breaking: #93182 - Changed file extension for gzip compressed files"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-93182-1651654104"
source: "Changelog/12.0/Breaking-93182-ChangedFileExtensionForGzipCompressedFiles.rst"
typo3-version: "12.0"
typo3-major: 12
type: "breaking"
issue: 93182
forge: "https://forge.typo3.org/issues/93182"
tags: ["Backend", "Frontend", "NotScanned", "ext:core"]
rendered: "2026-09-17T21:17:42+00:00"
---

# Breaking: #93182 - Changed file extension for gzip compressed files {#breaking-93182-changed-file-extension-for-gzip-compressed-files}

See [forge#93182](https://forge.typo3.org/issues/93182)

## Description {#description}

When using file compression for resources such as JavaScript or
StyleSheets via `$GLOBALS[TYPO3_CONF_VARS][FE][compressionLevel]` or
`$GLOBALS[TYPO3_CONF_VARS][BE][compressionLevel]` the generated files are
now written via the file extension ".gz" instead of ".gzip" in previous versions.

TYPO3 follows the de-facto standard for compressed assets,
as ".gz" is much more widespread than ".gzip" file extensions
(see [https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types)).

## Impact {#impact}

Compressed resources are now generated and served via ".gz".

## Affected installations {#affected-installations}

TYPO3 installations setting the global configuration option.

## Migration {#migration}

Adapt possible `.htaccess` or other webserver configuration files
by replacing ".gzip" with ".gz" if this feature is activated.