Good to know: Free-use terms vary by tool and plan. When a card lists no tool-specific limit, check quotas, watermarks and export terms on the official page.
ImageOptim is a free, open-source Mac app that you drag images into to shrink PNG, JPEG, GIF and SVG files; it is lossless by default and offers an optional lossy mode.
Compress, Resize or Convert Images
Good to know: Requires desktop installation.
XnConvert is a desktop batch image converter from XnSoft for Windows, macOS and Linux that resizes, crops, converts and edits many images with one saved list of actions.
Compress, Resize or Convert Images
Good to know: Requires desktop installation.