Browser-based HEIC to JPG conversion for iPhone photos using JavaScript

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iPhones save photos in HEIC format by default, which is smaller than JPG but often rejected by websites, forms, and Windows apps. Because only Safari can natively decode HEIC, the author recommends the heic2any library, which uses WebAssembly to convert files directly in the browser. The library is about 1.3 MB, so it is loaded only after a user selects a HEIC file to keep page loads fast. Developers are advised to handle multi-image HEIC outputs as arrays, check file extensions since MIME types can be empty, convert files sequentially to limit memory use, and use a quality setting of 0.9. Since the file never leaves the user's device, the approach also suits private photos.

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