Windows converts HEIC photos to JPG natively, but browsers cannot decode the format

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Windows users can convert iPhone's HEIC image files to JPG without third-party tools like ImageMagick, using built-in HEIF codec support exposed through PowerShell and the Windows Imaging Component. Microsoft's HEIF and HEVC Store extensions, which come pre-installed on many OEM devices, enable both decoding and encoding of HEIC files directly on Windows 11. However, major browsers including Chrome cannot decode HEIC images at all, meaning every online HEIC-to-JPG converter tool silently uploads files to a remote server for processing. This has real privacy implications when the photos contain sensitive content such as people or personal documents. Python's Pillow library also lacks native HEIC support and requires the separate pillow-heif plugin to handle the format.

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