It often happens with files exported from older software or specific CAD programs where font character mappings are lost. How to Fix It
Adobe-GB1 Primary Use: Simplified Chinese as used in mainland China and Singapore.
If you only need to print, view, or visually edit the document without changing the actual wording, converting the text into vector shapes strips out the font requirement entirely.
: To keep PDF file sizes small, creators embed only the specific characters used in the document rather than the entire alphabet. The engine appends a randomized prefix or string (like F1 or F5) to identify that unique subset. cidfont f1 f2 f3 f4 f5 f6 full
It seems you're asking for a review or explanation of (Character ID fonts), specifically looking into variants labeled F1, F2, F3, F4, F5, F6 — possibly in the context of PostScript , PDF , or printer firmware (like Canon, Ricoh, or HP’s implementation of CID-keyed fonts).
In this context, F1 , F2 , etc., simply refer to font objects elsewhere in the file's structure. They are part of the PDF's internal architecture.
to view the PDF (e.g., Adobe Acrobat, Chrome)? It often happens with files exported from older
Next time you generate a PDF with CJK text, check the font properties. If you see /CIDSystemInfo << /Registry (Adobe) /Ordering (Japan1) /Supplement 6 >> , you’re looking at an font – and you now know exactly what that means.
The font ensures that there is a glyph assigned to every character code in its defined CID map, allowing for proper text rendering.
| Label | Likely use | Notes | |-------|-------------|-------| | F1 | Standard serif (Mincho style) | Good for body text in CJK | | F2 | Standard sans-serif (Gothic) | Clear for headings | | F3 | Bold variant | Often missing in older printers | | F4 | Italic/slant | May be synthetic | | F5 | Light/demi | Rare | | F6 | Monospace or symbol | Not always present | : To keep PDF file sizes small, creators
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
gs -q -dNODISPLAY -c "(yourfile.pdf) runpdfbegin /pdfshowfont where pop pdfshowfont quit ifelse"
This article was fact-checked against PDF 1.7 and PDF 2.0 ISO standards (ISO 32000-2:2020).
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Impossible fonts to be found / Fontes impossíveis de achar
If you can see the text on your screen but get an error when printing—or if the file is acting glitchy—you can force the system to flatten the fonts.