Requirements v7+

Since mPDF 7.0 is compatible with these PHP versions:

• PHP >=5.6 <7.3.0 is supported for mPDF >= 7.0
• PHP 7.3 is supported since mPDF v7.1.7
• PHP 7.4 is supported since mPDF v8.0.4
• PHP 8.0 is supported since mPDF v8.0.10
• PHP 8.1 is supported as of mPDF v8.0.13
• PHP 8.2 is supported as of mPDF v8.1.3
• PHP 8.3 is supported as of mPDF v8.2.1
• PHP 8.4 is supported as of mPDF v8.2.5

PHP extensions required, partially required or recommended:

• PHP mbstring (including mbregex, which needs to be explicitly enabled in some environments) and gd extensions have to be loaded.
• Additional extensions may be required for some advanced features such as
  • zlib for compression of embedded resources such as fonts or for importing existing PDF files with FPDI
  • bcmath for generating barcodes
  • xml for character set conversion and SVG handling.
  • curl extension is used for remote HTTP calls if available.

mPDF is not compatible with PHP function overloading (mbstring.func_overload)

mPDF has issues fetching external HTTP resources with single threaded servers such as php -S. A proper server such as nginx (php-fpm) or Apache is recommended.

For requirements of versions <7.x see the dedicated page