Mac's sips tool batch resizes images in seven formats but fails on WebP

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The built-in Mac command-line tool sips can batch resize images without third-party software. A simple command resamples originals without confirmation, while adding an --out flag preserves original files. Testing shows sips successfully writes seven image formats plus PDF. However, it fails to write WebP files, returning an unknown error. The tool also rejects some format aliases like 'tif' and 'heif' that differ from their working identifiers.

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