These are the small jobs that usually send you hunting for a sketchy converter site: change a format, shave a file under an upload limit, strip GPS data from a photo, check whether a PNG really has transparency. Each utility here does exactly one of those jobs, locally, the file is read in your browser and the result is handed straight back, with no upload, watermark, or signup. They pair naturally with the bigger tools: run a cut-out or an edit first, then finish with the right utility to meet whatever spec your platform demands.