TYPO3 v6 has reached its end-of-life April 18th, 2017 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.

There is no further ELTS support. It is strongly recommended updating your project.

The Install Tool

The Install Tool provides tools to help you with the maintainance of your installation: Upgrading, checking the system environment, configuring settings from $TYPO3_CONF_VARS and solving problems. Its usage is not dependent on a working Backend, and you access it using a single password.

First go to your site and enter the install tool (


If you see a message "The Install Tool is locked", create a new file named "ENABLE_INSTALL_TOOL" in the folder typo3conf/. Then reload the page.

Important actions

The section provides basic information about your system and several functions which you need for maintenance tasks or during an upgrade.

The "Important Actions" section of the Install Tool.

The Database analyzer can be used to compare the current structure of your database with the expected structure for the TYPO3 version you are using. The next step allows you to update the structure of your database accordingly.

The Clear all Cache functionality can empty all caches: Frontend, Backend and language caches.

The Check for broken extensions can be run to make sure that all ext_tables and ext_localconf files contain valid PHP code, so that they can be loaded without breaking the system.

The Core update can update the TYPO3 Core to the newest minor version.

Apart from these functions, this section also contains options to change the install tool password, to change the site name, to change the encryption key and to create a Backend administrator user. Usually you do not need these functions.

Configuration presets

This section provides default settings for different setups.

The section "Character set conversion settings" allows you to select the program which should be used for character set conversions.

The section "Development / Production settings" allows you to set an application context, in which TYPO3 should be running. E.g. if set to "Development", all kinds of error reporting, debugging and deprecation logging will be activated. If set to "Production", all these settings will be deactivated.

The "Image handling settings" contain presets for different image processing programs (namely ImageMagick and GraphicsMagick). Select the one you have available.

Finally the preset "Extbase object cache" allows you to choose the kind of caching system for Extbase to use.

All configuration

Here you can configure all installation options concerning your TYPO3 installation. We suggest you go through the whole list and read the description of the settings carefully at least once, so you get an impression of what you can configure. Normally you can, but you don't have to change anything here during installation, as the previous steps took care of the most important settings.

Upgrade wizard

You don't need the upgrade wizard while installing TYPO3. This function will be explained in a later chapter about upgrading TYPO3.

System environment

The section contains a huge number of environment checks, which notify you of (potential) problems in your installation. It checks Apache settings and the status of important PHP modules and PHP settings. It also contains full output of phpinfo() and some constants used by TYPO3.

Folder structure

This section shows whether the files and folders in your installation have the correct permissions. This is important so that TYPO3 can function properly and so that other users on the web server do not get access to (possibly confidential) data.

Test setup

The section "Test setup" contains a test for the mail function and for image processing. Try each test to see if you have configured your image generation settings correctly. If you have problems, check the explanation of the test for a hint on how to solve them. Additionally, have a look at the image processing settings in the section "All configuration".

You might also find help in the Troubleshooting section below.

Clean up

You don't need this section whilst installing TYPO3. This section is meant to provide methods to clean up your TYPO3 installation after it has been running for a while. You can use it to delete cached images, which is helpful when you are configuring the image processing settings. This section is also relevant during an upgrade.