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    1. Home
    2. Font File Formats
    3. CFF

    What's on this Page

      • What is a CFF file?
      • CFF File Format
        • Data Layout
        • Data Types
        • Header
      • References

    What is a CFF file?

    A file with .cff extension is a Compact Font Format and is also known as a PostScript Type 1, or CIDFont. CFF acts as a container to store multiple fonts together in a single unit known as a FontSet. The design of CFF fonts allow embedding PostScript language code that permits additional flexibility and extensibility of the format for usage with printer environments. CFF font files can be opened and converted using APIs such as Aspose.Font.

    CFF File Format

    CFF files are binary files that contain a structured data layout, has defined data types, a header, glyph organization and table dictionaries. More details about these can be found in the compact font format specifications.

    Data Layout

    The data layout of CFF file format is as shown below.

    EntryComments
    Header–
    NameINDEX–
    Top DICT INDEX–
    String INDEX–
    Global Subr INDEX–
    Encodings–Charsets–
    FDSelectCIDFonts only
    CharStrings INDEXper-font
    Font DICT INDEXper-font, CIDFonts only
    Private DICTper-font
    Local Subr INDEXper-font or per-Private DICT for CIDFonts
    Copyright and Trademark Notices–

    Data Types

    CFF data types are as shown in the following table.

    NameRangeDescription
    Card80 –2551-byte unsigned number
    Card160 – 655352-byte unsigned number
    Offsetvaries1, 2, 3, or 4 byte offset (specified by OffSize field)
    OffSize1–41-byte unsigned number specifies the size of an Offset field or fields
    SID0 – 649992-byte string identifier

    Header

    The binary data begins with a header having the format shown in the following table.

    TypeNameDescription
    Card8majorFormat major version (starting at 1)
    Card8minorFormat minor version (starting at 0)
    Card8hdrSizeHeader size (bytes)
    OffSizeoffSizeAbsolute offset (0) size

    References

    • CFF File Format
    • Adobe Technical Note - Type2 Charstring Format