BIN to CID Converter

BIN refers to MacBinary-encoded font files, a transfer format that preserves classic Macintosh file system features when moving data across platforms. Classic Mac OS stored fonts using the resource fork — a secondary data stream invisible to non-Mac systems — which meant that simply copying a Mac font to a Windows PC or Unix server would strip the actual font data entirely. MacBinary solves this by combining both the data fork and resource fork into a single flat file with a 128-byte header containing the original HFS metadata. In the font context, BIN files typically wrap TrueType suitcase fonts, PostScript Type 1 LWFN outline files, or bitmap NFNT font resources. The format was first specified in 1985 by Dennis Brothers and collaborators from the early Mac community, with MacBinary II following around 1987 and MacBinary III arriving in 1996 to support longer filenames. A key advantage is lossless preservation: every byte of the original Mac font file survives intact through email, FTP, or cross-platform file sharing, including creator and type codes that identify the font format. The single-file packaging is another practical strength — rather than dealing with separate data and resource streams, users and automated systems handle one portable container. Although modern macOS has moved away from resource forks and Mac fonts now typically ship as OTF, TTF, or DFONT files, BIN remains important for accessing archived font collections from the classic Mac era.