If you encounter issues during or after installation, try:
If you manage a server that processes thousands of PDFs daily, create a script to install CIDFont mappings dynamically.
You can download free CJK CIDFonts from Google Noto Fonts (search "Noto CJK").
: In Adobe Acrobat , you can use the Preflight tool to fix embedding issues: Go to Tools > Print Production > Preflight . Select the PDF fixups category. Choose Embed missing fonts and click Analyze and fix . cidfont f1 f2 f3 f4 f5 f6 install
"CID" stands for Character Identifier , a type of font format (often CJK - Chinese, Japanese, Korean) used in PostScript and PDF documents to manage large character sets.
Linux servers are the most common place where cidfont f1 f2 f3 f4 f5 f6 install errors occur. Ghostscript on Linux uses a Fontmap file to redirect generic names to actual font files.
If you know what the font should be (e.g., the document looks like Arial), you can sometimes force a replacement. In professional tools like , you can use the Preflight tool to embed missing fonts or convert existing ones to a standard format. Summary Checklist If you encounter issues during or after installation,
# Debian/Ubuntu sudo apt install fonts-noto-cjk
The F1–F6 tags often correspond to these standard CIDFonts:
Get them from an old Adobe Acrobat/Reader installer or a legacy font pack (look for cidfont.ps or CMap files). Select the PDF fixups category
CIDFonts, also known as CID (Character Identification) fonts, are a type of font used in PostScript and PDF files. They are commonly used in Asian languages, such as Chinese, Japanese, and Korean, to represent complex character sets. CIDFonts are designed to work with the Adobe PostScript interpreter and are widely used in various applications, including desktop publishing, graphic design, and digital printing.
F1 through F6 act as placeholders. If the PDF viewer cannot find the "key" to translate these aliases back into actual fonts, the document will display garbled text, dots, or blank spaces. How to Fix the CIDFont F1-F6 Missing Error