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CID stands for . Developed by Adobe, CID fonts are designed to handle languages with massive character sets, such as Chinese, Japanese, and Korean (CJK). Instead of mapping a character directly to a keyboard letter, a CID font indexes characters by unique identification numbers. This architecture allows a single font file to store tens of thousands of complex glyphs. 2. What are F1, F2, F3, and F4?
When creating a PDF, the software often embeds only the characters actually used in the document to save space. To differentiate these partial fonts, the PDF processor names them sequentially (F1, F2, etc.).
To avoid confusion with F1, F2, F3, F4 , follow these rules:
In many cases, these labels correspond to common system fonts used in the original file: Often maps to Arial Bold . CIDFont+F2: Often maps to Arial Regular . cid font f1 f2 f3 f4
, a free and open-source font editor, has robust support for CID-keyed fonts. You can use it to inspect a CID font's structure, which comprises multiple "sub-fonts." For example, one sub-font might contain only Latin letters, another solely Hiragana, and a third exclusively Kanji.
If you own Adobe Acrobat Pro, you can force the document to embed the missing font structures: Open the menu and select Print Production . Click on Preflight .
To understand why CID is so important, we must look back at traditional PostScript Type 1 fonts. Type 1 fonts were designed for Western languages and are limited to a maximum of per font. This is perfectly fine for the Latin alphabet but entirely inadequate for Chinese, Japanese, or Korean, which have tens of thousands of characters.
Download and install the (specifically the Asian Font Pack). Restart Adobe Acrobat and attempt to reopen the document. Solution 3: Change the Printer Driver Settings Did you the document, or did someone else send it to you
If you need to edit text, try manually changing the font to , Times New Roman , Myriad Pro , or Roboto . These are the most common fonts that trigger this naming error when they fail to embed. Flatten or Outline (Last Resort) :
This system is composed of two critical resources:
The PDF viewer reads the CMap, finds the CID, and draws the exact visual glyph on your screen.
When a software program (like Adobe InDesign, Microsoft Word, or AutoCAD) exports a document to a PDF, it compiles a list of the fonts used in that document. Instead of mapping a character directly to a
If is a subsetted CID font containing only 50 specific Chinese characters, you cannot type new text into that PDF using font F3. If you try to edit the text and type a character that wasn't in the original document, it will appear as a blank space or a generic rectangle ( 3. Font Substitution Failures
pdffonts document.pdf
First, let’s break down the acronym. stands for Character Identifier .