Converts iPhone HEIC/HEIF photos to JPEG or PNG, decoding with a WebAssembly build of libheif (LGPL-3.0) and re-encoding with sharp -- the same pipeline as GO AI's browser-based HEIC converter tool, run server-side. Accepts 1-50 files as {filename, dataBase64} (each up to ~30MB decoded); every file is byte-sniffed by its actual magic bytes, never by filename extension or claimed mime type, so an iPhone photo that iOS already delivered as a JPEG (picked from Photos rather than Files) is detected and reported as already_converted -- passed through unchanged, not re-encoded -- while real HEIC/HEIF input is decoded and re-encoded to the requested format (JPEG with a caller-set quality 50-100, or lossless PNG). Any orientation stored on the HEIC is applied automatically during decode, so output comes out right-side up. Metadata (EXIF: GPS, timestamp, camera) is not carried over, matching the source page. Each converted or passed-through file is returned individually (inline if small, as a download link if large), or bundled as one converted.zip when bundleAsZip is true and more than one file produced output; a file that fails to decode is reported with status failed and an error message rather than aborting the batch. The JSON report lists status, dimensions, and before/after byte sizes for every input file, in input order.