CID (Character Identifier) fonts are a type of font format used in digital typography. Developed by Adobe, CID fonts are designed to support a large number of characters, making them ideal for typesetting in various languages, including Asian languages with complex character sets. CID fonts are commonly used in PostScript and PDF files, ensuring that text is rendered accurately and consistently across different platforms.

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To fix the issue, it helps to understand what is happening under the hood of your PDF viewer.

Navigate to a reputable cloud PDF utility tool (such as Sejda, ILovePDF, or PDF2Go). Upload your file to their or Optimize PDF tool.

are specialized font formats used primarily in PDF documents. They handle complex languages with massive character sets. Examples include Chinese, Japanese, and Korean (CJK).

are a standard format used to display large character sets, particularly CJK (Chinese, Japanese, Korean) characters, in PostScript and PDF documents. Unlike traditional fonts, CID fonts allow for efficient mapping of thousands of characters.

// iText 7 example - Force full CID embedding PdfFontFactory.FontEncodeing = PdfEncodings.IDENTITY_H font.setSubset(false);