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title: PDF Quirks | PostGrid
description: How PostGrid handles uploaded PDFs, including annotation visibility rules and other behaviors that affect print output fidelity.
---

How PostGrid handles uploaded PDFs

PDFs are very complicated. Here’s some things PostGrid does to ensure that what you see in the preview is exactly what is printed:

- PDF annotations can be configured to only be visible when printed and not be visible in your PDF viewer. However, since we want to have the printed copy be identical to what you see when viewing (as this is the only way to have predictable results), we respect the invisibility for print as well