If you're wanting something that's not tied to a webservice jpeg-recompress https://github.com/danielgtaylor/jpeg-archive https://github.com/danielgtaylor/jpeg-

If you're wanting something that's not tied to a webservice jpeg-recompress https://github.com/danielgtaylor/jpeg-archive https://github.com/danielgtaylor/jpeg-archive is great, configurable too based on the quality you want.