Unlike traditional fonts that use a simple 1-byte encoding (max 256 characters), CID fonts are designed for (like Chinese, Japanese, Korean - CJK). They use a two-part system:
A font is a way of encoding data to support massive character sets, like those used in Chinese, Japanese, or Korean (CJK) languages. However, in most Western PDFs, these "F1, F2" names appear because the software that created the PDF couldn't properly embed the original font (like Arial or Times New Roman). Instead, it created a generic substitute. Usually: CIDFont+F1 often refers to a Bold weight. CIDFont+F2 often refers to a Regular weight. cid font f1 f2 f3 f4
When you see , it means: "The font resource named F1, which is a CID-keyed font." Unlike traditional fonts that use a simple 1-byte
If you are getting errors opening a file with these names in programs like Adobe Acrobat Affinity Designer , try these methods: The "Print to PDF" Trick Instead, it created a generic substitute
It is a reminder that our digital reality is fragile. It hangs by a thread of resource maps and embedded subsets. When the map is lost, we do not get chaos—we get the raw, structural truth.
. While these names may look like specific font families, they are actually "ghost" names—placeholders created by software when a document's original fonts are missing, improperly embedded, or re-encoded for efficiency. What is a CID Font?
By understanding the relationship between the , the tag (F1) , and the CMap , you transform from a confused user into a PDF power user capable of fixing font substitution errors, optimizing print workflows, and ensuring your international documents render perfectly every time.