Browser-Based HEIC Converter Uses WebAssembly to Keep Photos Off Servers
A developer has built a browser-only tool that converts Apple's HEIC image format to JPG, PNG, or WebP without uploading files to any server. The tool uses a WebAssembly build of libheif to decode HEIC files locally, processing raw pixel data via the browser's Canvas API before offering a download link. HEIC, Apple's default photo format since 2017, still lacks broad support on Windows and other non-Apple platforms as of 2026. The privacy-focused approach means photos never leave the user's device, and the tool works offline once the page is cached. The trade-off includes a several-hundred-kilobyte WASM bundle and higher CPU usage for large batch conversions, though single phone photos convert near-instantly.
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