> For the complete documentation index, see [llms.txt](https://help.pixfizz.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.pixfizz.com/orders-and-fulfillment/production-pdf-versions.md).

# Production PDF versions

Pixfizz fulfillment servers output PDF 1.4 or 1.5.

If you are using custom [PDF layers](/products-and-design/how-to-create-templates/pdf-layers.md) or any PNG images with 16-bit colors are detected in the artwork, the system will automatically output in PDF version 1.5, otherwise 1.4.

Currently there is no way to force a PDF version.