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This conversion needs a HEIF/HEVC codec that is not available in this browser engine yet.
HEIF can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.
HEIF and GIF can represent image animation, but their frame structures are not interchangeable. Retaining motion requires sequence decoding, compositing, timing and loop mapping plus an animation-aware encoder. No such transfer is implemented; a still-only pipeline would lose the sequence.
GIF uses at most 256 colours per GIF colour table and a transparent palette index rather than partial alpha. Richer colours and translucent edges need quantisation or compositing. Palette choice and dithering depend on the future engine; lossless GIF compression does not reverse palette reduction.
If HDR source content is exported through an SDR representation, it needs a display rendering. Values outside the output range require tone mapping, scaling or clipping; brightness relationships can change. Tone mapping, exposure and colour handling depend on the future engine. Renaming or lossless compression cannot preserve out-of-range values.
Source
High Efficiency Image File Format
An image container for individual pictures, collections and sequences. The codec inside determines compression.
Explore HEIF format →Target
Graphics Interchange Format
Indexed-colour images and simple frame animation. GIF uses LZW compression and palette-index transparency.
Explore GIF format →HEIF can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.
HEIF and GIF can represent image animation, but their frame structures are not interchangeable. Retaining motion requires sequence decoding, compositing, timing and loop mapping plus an animation-aware encoder. No such transfer is implemented; a still-only pipeline would lose the sequence.
GIF uses at most 256 colours per GIF colour table and a transparent palette index rather than partial alpha. Richer colours and translucent edges need quantisation or compositing. Palette choice and dithering depend on the future engine; lossless GIF compression does not reverse palette reduction.
Source and target sample models can differ in precision, channel layout, colour space and transfer function. Lossless compression only preserves the samples actually encoded; a precision reduction or colour conversion can already change them. The future engine defines numeric mapping, orientation and colour conversion; canonical depth facts are listed below where available.
HEIF: Exif, XMP, ICC, NCLX → GIF: Comments, Application extensions. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.