Why HEIC Files Silently Break Browser Image Tools and How to Fix It

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HEIC, the default photo format on iPhones, uses HEVC encoding that is patent-encumbered, meaning Chrome, Firefox, and Edge cannot decode it — only Safari can, since Apple licenses HEVC platform-wide. This creates a hidden bug where browser-based image tools fail silently with no error or preview when a HEIC file is uploaded. Common workarounds like renaming the file extension do not help, as decoders check the file's actual bytes rather than its name. Developers are also warned that iOS files frequently arrive with an empty file.type value, causing validation logic to incorrectly reject valid photos. The recommended fix involves detecting HEIC via its binary header and lazy-loading a WebAssembly-based decoder like heic2any only when needed, avoiding unnecessary bundle bloat for the majority of users.

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