View source for System requirements

These are the basic system requirements for a Contao webspace:

{| class="wikitable"
|- bgcolor="#f3f3f3"
!feature
!description
|-
| webserver
| Apache or IIS
|-
| PHP
| minimum version 5.2
|-
| PHP extensions
| GDlib, used for image resizing; SOAP (optionally), needs to allow external transfers so that you can use the extension repository within your Contao-backend; mbstring (optionally), needed for multi-byte character handling; mcrypt (optionally), needed for data encryption 
|-
| MySQL
| minimum version 4.1, though I definitely recommend version 5.x; MySQLi is also supported
|-
| browser (for Contao backend)
| a modern internet browser … don't even think about Internet Explorer 6 ;-)
|}

=== Recommended PHP configurations ===

{| class="wikitable"
|- bgcolor="#f3f3f3"
!parameter
!description
|-
| Safe mode
| Off
|-
| Maximum execution time
| 30 or greater
|-
| Memory limit
| 16M or greater
|-
| Register globals
| Off
|-
| File uploads
| On
|-
| Upload maximum filesize
| 8M or greater
|-
| GDlib extension
| On
|-
| SOAP extension
| On
|}

'''Tip:''' I recommend using the system check.