| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | — | Yes |
| Plans published | 1 | 5 |
| Spec score · Image Compression Software | 8.1 (#34) | 8.7 (#10) |
| API access | No | Yes |
| Batch processing | Yes | Yes |
| Compression | Optimization is lossless by default, with lossy recompression available as an option. | The homepage says Pixozip can compress images by up to 90% without visible quality loss. |
| Compression modes | both | both |
| Formats | It optimizes JPEG, PNG, WebP, SVG, and static GIF files; animated GIF and animated WebP are skipped. | The API accepts JPEG, PNG, WebP, AVIF, GIF, TIFF, JXL, and SVG; GIF and TIFF convert to PNG, while SVG stays SVG. |
| Free plan | Yes | Yes |
| Metadata controls | Yes | Yes |
| Purpose | imageopt is a cross-platform command-line image optimizer for local use and CI automation. | Pixozip provides an HTTP API and web dashboard for optimizing uploaded image files. |
| Image resizing | No | Yes |
| Supported formats | JPEG,PNG,WebP,SVG,static GIF | JPG,JPEG,PNG,WebP,AVIF,JPEG XL,GIF,TIFF,SVG |