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 PNG into JSON? Here's the honest answer — and the conversions that actually work.
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PNG is a lossless raster format with full transparency. It keeps every pixel intact, making it ideal for logos, icons, screenshots and graphics with sharp edges.
PNG opens in every browser and image viewer, plus Photoshop, GIMP, Preview and Photos.
No — JSON is a data format, not an image, so there's nothing to convert. You can convert your PNG to JPG, TIFF or WEBP 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.