
Once you have downloaded your high-quality CID fonts (like Noto CJK), here is how to fix your PDF or document error.
If you work with graphic design, large-format printing, or professional document processing, you have likely encountered the terms "CID Font" or specific font IDs like F1, F2, through F7.
This guide explains the technical nature of these fonts, clarifies the mystery behind the "F" numbers, and provides safe resources for downloading high-quality alternatives. Complete Guide to CID Fonts (F1, F2, F3,
Source: ipa-userfont.osdn.jp Quality: ★★★★☆
Developed by the Information-technology Promotion Agency (IPA) in Japan, these are high-legibility standard fonts for Japanese government documents. They are free for commercial use. All the above are high‑quality
Best for: Replacing all F1–F7 errors across multiple languages. Google Noto is designed to completely eliminate "Tofu" (missing character boxes). It includes high-quality CID-keyed versions for Japanese, Korean, and Chinese.
| Desired Alias | Recommended Free Font | Format | Source | |---------------|-------------------------------------|------------|--------------------------------------| | F2 (Mincho) | Noto Serif CJK JP | OTF/TTC | Google Noto (GitHub / Google Fonts) | | F3 (Gothic) | Noto Sans CJK JP | OTF/TTC | Google Noto | | F4 (Chinese Sim Sun) | Source Han Serif SC | OTF | Adobe / GitHub (Open Source) | | F5 (Chinese Sans) | Source Han Sans TC | OTF | Adobe / GitHub | | F6 (Korean Gothic) | Noto Sans CJK KR | OTF/TTC | Google Noto | | F7 (Korean Serif) | Noto Serif CJK KR | OTF/TTC | Google Noto | | F1 (Courier‑like) | Courier Prime (or Nimbus Mono) | TTF/OTF | Font Squirrel / GNU FreeFont | Noto Sans CJK (Covers JP
All the above are high‑quality, professionally hinted, support CID‑keyed OpenType (CFF/OTF) and include thousands of glyphs.
Font Squirrel is renowned for hand-picking high-quality fonts that are free for commercial use, avoiding the "junk" often found on other sites.
