Format guide
HEIF
High Efficiency Image Format
HEIF is the parent specification; HEIC is the most common variant of HEIF (using HEVC for compression). For most practical purposes the .heif and .heic extensions refer to the same kind of file.
How to open a HEIF file
Same compatibility profile as HEIC, Apple devices open it natively, Windows needs an extension, most browsers don't.
Primary use
iPhone photos; identical to HEIC for most users.
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