Browser-Based File Converter Keeps Images Local, Avoiding Server Uploads
The article describes a free image converter that processes files entirely in the browser rather than uploading them to a server. The author argues that typical online converters expose sensitive files to infrastructure users cannot verify, and offers a simple network-inspection method to confirm no file is transmitted. Conversion relies on decoding with createImageBitmap, drawing to a canvas, and encoding through WebAssembly codecs running in a Web Worker. The piece also covers practical challenges, including EXIF rotation, worker timeouts, HEIC decoding under strict Content-Security-Policy, and binary-searching JPEG quality to meet target file sizes.
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