Cid Font F1 F2 F3 F4 May 2026

In this extensive guide, we will dissect every aspect of the keyword —explaining what a CID font is, what the F1/F2/F3/F4 labels represent, how they are structured in PDF internals, common issues, and how to manage them effectively. Part 1: What is a CID Font? Before we can understand f1, f2, f3, f4 , we must first grasp the concept of a CID-keyed font . 1.1 The Origin of CID CID stands for Character Identifier . Traditional font encoding systems (like Type 1 or TrueType) were designed for languages with small character sets (e.g., Latin alphabet: 26 letters). However, languages like Japanese (Kanji), Traditional Chinese, and Korean have thousands of characters. Encoding each glyph directly would be inefficient.

pdffonts document.pdf Output example:

Manually repair the PDF object using a binary-safe PDF editor or re-save from the original application. 4.3 "F3 uses Identity-H encoding but no ToUnicode CMap" Effect: Copy-pasting text from that font yields garbage characters. cid font f1 f2 f3 f4