When you see CIDFont+F1 in a PDF font list, look at the "Actual Font" property. You will likely see:
A subset contains only the glyphs actually used in the document. A full embedding contains the entire character set (e.g., all 20,000+ CJK glyphs).
The keyword "cidfont f1 f2 f3 f4 f5 f6 full" likely reflects a user's urgent need to convert subset fonts to fully embedded fonts to fix extraction or editing problems.
Unlike traditional fonts (Type 1 or TrueType) that use a simple 1-byte encoding (maximum 256 characters), CID-keyed fonts support large character sets—often thousands of glyphs—required for CJK languages (Chinese, Japanese, Korean) as well as complex symbol sets. Adobe developed CIDFonts to bypass the 256-character limit.
A CIDFont is essentially a database of glyphs, each identified by a unique CID number. The mapping from a character code (like Unicode) to a CID is handled by a CMAP (Character Map).
In PDF syntax, a tag is a unique identifier. When a PDF creator embeds a CIDFont subset, it must ensure that the font name is unique, even if the original base font (e.g., "ArialMT" or "HeiseiMin-W3") appears multiple times in different documents or contexts.
The standard convention is:
<BaseFont> + <6-character random or sequential tag>
However, in many Adobe applications (specifically older versions of Acrobat Distiller, Illustrator, and InDesign), the tagging algorithm devolves into a predictable sequence when fonts are renamed during synthetic generation or font substitution. cidfont f1 f2 f3 f4 f5 f6 full
Thus, you see:
If you regularly encounter cidfont f1 f2 f3 f4 f5 f6 in your workflow, consider building a font substitution table and automating the re-embedding process using a script that calls Ghostscript. Your prepress sanity will thank you.
Last updated: October 2025. For questions about specific PDFs, use pdffonts -subst and inspect the font objects directly. Never trust a display name alone.
These are not specific "font families" like Arial or Times New Roman. Instead, they are internal aliases:
CID (Character Identifier): A method for encoding large character sets, often used in Unicode or Asian language fonts.
F1, F2, F3...: Arbitrary labels assigned by the PDF generator. For example, in some documents, CIDFont+F1 may actually be Arial Bold and CIDFont+F2 might be Arial Regular. Common Issues and Solutions
When you see these names, it usually indicates a missing font error, which can cause text to appear as dots, strange symbols, or not appear at all. 1. How to Identify the Actual Font If you need to know what font is supposed to be there: Use subsetting when:
Adobe Acrobat: Go to File > Properties (or press Ctrl+D) and click the Fonts tab.
Third-Party Tools: Some editors like Smallpdf allow you to click text blocks to see which font is missing. 2. How to Fix Missing Font Errors If a document won't display correctly, try these steps: Cidfont F1 F2 F3 F4 F5 F6 Full -
Cidfont F1 F2 F3 F4 F5 F6 Full -. The CidFont F series has been widely adopted as a de facto standard for CJK font rendering. 3.64.214.130 Embed a font issue in PDF Adobe Acrobat
The terms CIDFont F1, F2, F3, F4, F5, and F6 are placeholder names used in PDF documents to represent subsetted fonts that were not fully embedded or could not be properly identified by the viewing software.
When a document is exported to PDF, the software often "subsets" the fonts—meaning it only includes the specific characters used in that document to save file space. If the original font name is lost or the embedding fails, the PDF viewer assigns a generic label like CIDFont+F1. Key Details about these Fonts
What they represent: These are often standard fonts like Arial or Times New Roman that have been renamed during the PDF creation process. For example, in some files, F1 might be Arial Bold and F2 might be Arial Regular.
Identification: The "F" numbers typically refer to different font weights or styles (e.g., Bold, Italic, Regular) within the same document. When you see CIDFont+F1 in a PDF font
Common Issues: Users often see error messages like "CIDFont+F1 cannot be created or found" when opening a PDF in programs like Adobe Illustrator or Acrobat. This happens because the software looking for the original font cannot find a font on your computer named "CIDFont+F1". How to Fix Font Errors
If you are seeing these names and the text is appearing as dots or garbled characters, you can try these solutions:
Re-export/Save As: Open the PDF in a basic viewer like macOS Preview and use "Export as PDF" to "flatten" and re-embed the fonts.
Find and Replace: In professional design software like Adobe Illustrator, use the Find Font tool to replace the missing "CIDFont" placeholders with a standard font like Arial or Helvetica.
Place as Image: If you don't need to edit the text, you can "Place" or "Import" the PDF as an embedded image rather than opening it directly as an editable file.
Are you trying to edit a PDF that is showing these font errors, or just looking to identify which specific fonts they actually are? Impossible fonts to be found / Fontes impossíveis de achar