If you urgently need to view a PDF with missing F1/F2/F3 fonts, upload it to and preview it there—Google’s PDF renderer often substitutes missing CJK fonts automatically, without any local download.

Be cautious of sites offering "free repack downloads" for these specific terms. Because these are generic technical errors and not actual font products, such downloads are frequently flagged by virus scanners as . CIDFont+F1 issue - Adobe Community

This article will explain what CID fonts are, the specific roles of F1, F2, and F3, and how to safely perform a and installation.

In this article, we’ll break down what these fonts actually are, why they cause errors, and the safest way to resolve the issue without risking your system's security. What Are CID Font F1, F2, and F3?