Browser-based GIF compression and resizing without uploading files to a server

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Chat apps still enforce upload limits on GIFs, and sending clips to online compressors raises privacy concerns. The approach described decodes and re-encodes GIFs entirely inside a browser tab, using a Web Worker to keep the main thread responsive. Memory is managed with a total pixel cap and downscaling for oversized files, while frame delays are clamped to 20 ms to avoid clients playing them slower. Opaque animations are further shrunk by writing only changed pixel regions between frames. To hit byte targets, the tool steps through a fixed sequence of color, scale, and frame reductions until the output fits.

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