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Open-source CLI tool converts entire image folders to WebP with one command

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A developer has released an open-source, MIT-licensed command-line tool called assetopt that converts entire folders of JPEG and PNG images to WebP format locally without uploading files to any external service. The tool is configured via a simple JSON file and mirrors the source directory structure while leaving original files untouched. WebP images are typically 25–35% smaller than equivalent JPEGs or PNGs, and tests on sample files showed savings ranging from 17% for JPEGs to nearly 90% for photos mistakenly saved as PNGs. The CLI also includes a dry-run analyze mode that reports before-and-after file sizes without writing any output, and an incremental cache ensures only changed files are re-encoded during quality tuning. The tool can be installed globally via npm or run without installation using npx, and also supports routing transparent PNGs to the AVIF format automatically.

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