: Try replacing the missing F1/F2 fonts with Arial , Helvetica , or Times New Roman . Often, this immediately restores the text's appearance.
: Open the PDF in Adobe Acrobat, go to File > Properties > Fonts . This list might show the "real" font name next to the F1/F2 label, allowing you to download the correct typeface from a legitimate site like Google Fonts or Fontshare .
Understanding CID Fonts (F1 to F7): Crucial Guide and Safe Troubleshooting CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
Websites offering "CID Font F1 Free Download" are often misleading. They may provide a generic substitute font, but it will likely not match the specific typeface used in your original document because "F1" is not a unique font name. CID F1 F2 F3 F4 F5 F6 F7 Fonts Free Download - Web Fonts
Once you know the real name, you can search for that specific font legally online or activate it on your computer. Method 2: Install Adobe CJK Fonts Pack : Try replacing the missing F1/F2 fonts with
将CIDFont文件夹中的字体文件复制到Adobe Acrobat的安装目录下的 Resource/CIDFont 文件夹内。例如路径可能为 Acrobat X Pro/App/Resource/ （不同版本路径略有差异，参考具体软件的环境配置）。
The original creator embedded only the specific characters used in the document. If you try to edit the text or use new characters, the system looks for the rest of the font under the generic alias and fails. This list might show the "real" font name
For professional users: Use a font management tool or edit the PDF’s font dictionary using a tool like cpdf (Coherent PDF) or Enfocus PitStop Pro to permanently replace /F1 with the new font path.
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: Often maps to Arial Bold or Times New Roman Regular .
When you see CIDFont+F1 , CIDFont+F2 , etc., in a PDF or a print error log, it often means the original font (like Adobe Song Std or Kozuka Mincho) was embedded as a subset to ensure the document displays correctly on other computers, as noted on O'Reilly .