image/heif

The container standard behind HEIC — ISO/IEC 23008-12, a general image wrapper built on the same box structure as MP4. Strictly, image/heif is the codec-agnostic type (brand mif1 in the ftyp box) while image/heic promises HEVC-coded content; in the wild the two labels get swapped constantly, so accept both and check the ftyp brand if the codec matters. Browser support is as thin as HEIC's, so treat it as a capture and interchange format, not a delivery one.

Defined by HEIF technical overview (ISO/IEC 23008-12) · IANA registration. Registry facts from the IANA media-types registry via mime-db.