TrueType font
font/ttf
A raw TrueType font file — the sfnt structure Apple designed in the late 1980s, served without any web wrapper. Before RFC 8081 created the font tree in 2017, these shipped under a zoo of labels: application/x-font-ttf, application/font-sfnt, even application/octet-stream; font/ttf is now the one correct answer. On the web, prefer WOFF2, which is the same font compressed — raw TTF belongs in installers and design tools. The signature 00 01 00 00 is the sfnt version number for TrueType outlines, and OpenType fonts with TrueType glyphs start with the same four bytes.
Magic bytes
00 01 00 00 · offset 0
Per Microsoft OpenType spec — font file tables · test a file against it.
Defined by RFC 8081 · IANA registration. Registry facts from the IANA media-types registry via mime-db.