JSON isn't an image
A .json file stores text data — settings, coordinates, lists — not pixels. There's no image inside to extract, and a picture can't be saved as a JSON data file.
Looking to turn a HEIC into JSON? Here's the honest answer — and the conversions that actually work.
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HEIC is the high-efficiency format iPhones and iPads use to store photos — about half the size of JPG, but not supported everywhere, so it often needs converting.
HEIC opens on Apple devices and Windows 11; older systems need it converted to JPG/PNG.
No — JSON is a data format, not an image, so there's nothing to convert. You can convert your HEIC to PNG, JPG or TIFF instead.
JSON is a text-based data format used for app settings and, with a matching image, sprite-sheet coordinates. It isn't a picture.
A sprite sheet is a .png + .plist pair. Use a texture packer (TexturePacker, Cocos2d) to pack or unpack them together; a single-file converter can't.