F5 F6 [repack] Full: Cidfont F1 F2 F3 F4
Understanding the phrase "cidfont f1 f2 f3 f4 f5 f6 full" is essential for anyone dealing with digital documents, specifically PDFs. This specific sequence of characters is not a standard font you can download for creative design; rather, it is a technical artifact often encountered when a PDF viewer or editor fails to recognize or embed the original fonts used in a document. What is a CIDFont?
The term CIDFont stands for "Character Identifier Font". It is a way of encoding font data that supports extremely large and complex character sets—far beyond the standard Western European alphabets. This method is frequently used for languages like Chinese, Japanese, and Korean (CJK) or when professional software like Adobe InDesign converts OpenType fonts during the PDF embedding process. Deciphering the Labels (F1, F2, F3, etc.)
The designations "F1" through "F6" are generic placeholders. When a software program (like a PDF generator or an editor) cannot embed the actual name of a font or its subset, it assigns these internal aliases to different font styles within the document:
F1: Often mapped to Arial Bold or a primary serif font like Times New Roman Regular.
F2: Frequently used for Arial Regular or Times New Roman Bold.
F3, F4, F5, F6: Correspond to other variants such as Italics, Bold Italics, or entirely different font families used elsewhere in the file.
The word "full" typically refers to a Full Embedding of the font, meaning every character in the font is included in the file, rather than just a "subset" of characters actually used. Common Issues and Errors
Users most often encounter "CIDFont+F1" when a PDF is broken or "poorly subsetted". Common symptoms include: Impossible fonts to be found / Fontes impossíveis de achar cidfont f1 f2 f3 f4 f5 f6 full
The string "cidfont f1 f2 f3 f4 f5 f6 full" typically appears when a PDF viewer or editor (like Adobe Acrobat or Affinity Photo) encounters a document with missing or poorly embedded fonts. In PDF technical terms:
CIDFont: Refers to "Character ID Fonts," a method for handling large character sets, such as those used in Asian languages or complex Unicode documents.
F1, F2, etc.: These are generic internal aliases (tags) assigned by the software that created the PDF. They do not reveal the original font name (e.g., Arial or Times New Roman) but represent specific font styles used in that document.
Full: Often indicates that a font is supposed to be "Fully Embedded" rather than just a subset of characters. Common Issues
If you are seeing these names, it usually means your system cannot find the specific font files required to display the text correctly. This often leads to:
Missing text: The document opens, but the text is blank or appears as dots/boxes.
Error messages: Alerts like "CIDFont+F1 cannot be created or found". Understanding the phrase "cidfont f1 f2 f3 f4
Mangled rendering: The text displays in a generic replacement font that may mess up the layout. How to Fix Impossible fonts to be found / Fontes impossíveis de achar
Part 8: The Future – Will F1–F6 Become Obsolete?
With modern PDF 2.0 and the widespread adoption of TrueType/OpenType Collections (TTCs) and Font Variation Tables, the need for synthetic F-tags is decreasing. However, legacy RIPs (many still running in newspaper and book printing plants) rely on the old CIDFont + F1–F6 model.
Furthermore, as long as Adobe Distiller remains in use for compatibility with legacy workflows, CIDFont+F1 through +F6 will continue to appear. Knowing how to interpret and optimize them remains a valued skill.
Problem 1: "CIDFont+F1 is corrupted" error in Acrobat Pro
Cause: The font dictionary for F1 points to a missing or malformed CMap table. Solution:
- Open the PDF in a text editor (or PDF debugging tool like
qpdf). - Search for
/BaseFont /CIDFont+F1. - Verify the
/CIDSystemInfodictionary is present. - Use Preflight (Acrobat Pro) → "Embed missing fonts" → This sometimes regenerates F1–F6 correctly.
Scenario 3: Variable Data Printing (VDP)
VDP systems (like XMPie or FusionPro) dynamically generate text fields. To ensure fast rendering, they create up to six cached CIDFont subsets. Each time a new character enters the data stream, it is allocated to one of the six slots.
Part 1: What is a CIDFont?
Before we tackle the F1...F6 suffixes, we must understand the container. CIDFont (Character Identifier Font) is a font format standard developed by Adobe for PostScript and PDF. Unlike simple fonts (Type 1) that use 8-bit character codes (256 glyphs max), CIDFonts are designed for large character sets:
- Double-byte encodings (16-bit) allow over 65,000 glyphs.
- Essential for CJK scripts (Chinese, Japanese, Korean).
- Used for OpenType fonts when embedded in PDFs.
A CIDFont system consists of two parts:
- The Font Dictionary (contains the actual glyph data).
- The CMap (Character Mapping file that maps character codes to glyph IDs).
When a PDF is created, the PDF writer often needs to subset the font (only include the characters used in the document). To do this efficiently, it renames the font internally.
Conclusion: Mastering the F-Tag Sequence
The sequence CIDFont F1, F2, F3, F4, F5, F6 full represents a complete set of up to six fully embedded synthetic composite fonts in a PDF or PostScript environment. It is not an error, but a feature of Adobe’s font substitution and subsetting architecture.
Key takeaways:
F1–F6reflect internal tagging, not actual font names.Fullmeans the entire character set is embedded—useful for editing but heavy for storage.- Managing these tags effectively requires tools like Acrobat Preflight,
pdffonts, and an understanding of CIDFont dictionaries.
The next time you see these six mysterious fonts in a PDF report or prepress ticket, you will not see chaos—you will see a predictable, structured, and manageable system at work. And now, you know exactly how to handle it.
Further Resources
- Adobe Specification: Technical Note #5014 – CID-Keyed Font Technology Overview
- GitHub:
qpdf– A command-line tool to inspect and repair PDF font dictionaries. - Preflight Profiles: "Replace synthetic fonts with standard names" (available in Acrobat Pro DC).
This article was fact-checked against PDF 1.7 and PDF 2.0 ISO standards (ISO 32000-2:2020).
F5: Adobe-KR (Korean – Extended)
Registry-Ordering: Adobe-KR (Less common; often merged with F4 in modern use)
Primary Use: Legacy or extended Korean character sets. Part 8: The Future – Will F1–F6 Become Obsolete
- Note: F5 is rarely used independently today. Historically, it distinguished between different KS standards (e.g., KS X 1001:1998 vs. older versions). Most contemporary Korean CIDFonts use F4 with updated versions (e.g., Adobe-Korea1-2). In many technical documents, F5 is considered deprecated or reserved.
F1: Adobe-Japan1 (Japanese)
Registry-Ordering: Adobe-Japan1
Primary Use: Japanese text, including Kanji, Hiragana, Katakana, and Latin punctuation.
- Character Set Size: Evolved through versions (from 7,792 to over 23,000 glyphs in Adobe-Japan1-6).
- Typical Fonts: Kozuka Mincho Pro, Kozuka Gothic Pro, Source Han Sans (Japanese subset).
- Key Features: Supports JIS X 0208, JIS X 0212, and JIS X 0213 standards. Includes proportional Latin, circled numbers, and Japanese-specific kana ligatures.
- Common CMap Names:
90ms-RKSJ-H,90pv-RKSJ-V,UniJIS-UTF16-H.
How to detect "full" embedding in tools
- Acrobat Pro: File > Properties > Fonts — shows "(Embedded Subset)" vs "(Embedded)".
- PDF inspection tools (pdffonts from poppler): shows "yes" or "no" for embedding and subset flags; CID fonts appear with their font names and encodings.
- Ghostscript and PDF libraries can extract font tables to confirm full vs subset.
