stands for Character Identifier . CID-keyed fonts are a format designed by Adobe to address the limitation of standard font encoding, which typically holds a maximum of 256 characters.
Because these are placeholder names, you cannot "download" a font named F1. Instead, use these methods to identify and restore the correct font: 1. Identify the Original Font Name
You do not need to pay for expensive software to fix this issue. Most major PDF software developers provide free, downloadable add-on packs containing the required CID character sets. CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
The application creating the PDF (like Word, a web browser, or a graphic tool) failed to identify the original font. Instead of throwing an error, it created a placeholder using Adobe’s CID structure to allow printing.
答：是的，多个网站提供的 CID Font F1 都是免费的，其中 ffont.ru 提供的 F1 字体明确说明可用于任何用途，包括商业用途，但建议在商业使用前确认授权信息。 stands for Character Identifier
Choose "Embed missing fonts" or "Convert text to outlines" if printing is the only goal. 4. Install the Adobe CJK Font Pack
很多人在搜索“CID font F1 F2 F3 F4 F5 F6 F7”时，常常对这些名称感到困惑。。当 PDF 创建时使用的字体无法在当前设备上找到时，系统会用类似 CIDFont+F1 的符号临时替代。 Instead, use these methods to identify and restore
While every PDF is different, users frequently find that these labels correspond to common system fonts:
tab. This often lists the original font names next to the placeholders. Common Substitutes
: Frequently, F1 corresponds to Arial Bold and F2 to Arial Regular , though this varies depending on the original document's layout. Solutions for Missing CID Fonts
These usually map to standard CJK (Chinese/Japanese/Korean) fonts or base PostScript fonts like: