The CID-keyed font format, when deployed as OpenType/CFF (Compact Font Format), offers significant advantages over traditional font formats, including better performance and memory efficiency compared to older OCF (Open Composite Font) formats.
CID (Character Identifier) fonts are a font format designed for large character sets, such as Japanese, Chinese, and Korean (CJK). Unlike standard fonts that use a simple encoding vector, CID fonts separate the character shape (the glyph) from the character code . This allows a single font to contain thousands of characters. cid font f1 f2 f3 f4 better
: Since these are often based on common typefaces, you can manually replace them in a PDF editor: F1/F2 are frequently Arial or Times New Roman . The CID-keyed font format, when deployed as OpenType/CFF
These fonts are based on TrueType font programs and use the Identity-H encoding for direct glyph mapping. This allows a single font to contain thousands of characters