| Price from | $3.25/mo | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | — | Yes |
| Plans published | 7 | 5 |
| Spec score · Image Compression Software | 8.3 (#27) | 8.7 (#10) |
| Batch processing | Yes | Yes |
| Compression | It targets lossless compression for PNG images and slight lossy compression for JPEG images while maintaining their visible appearance. | The homepage says Pixozip can compress images by up to 90% without visible quality loss. |
| Compression modes | both | both |
| Formats | Optimus can generate progressive JPEGs, and the paid HQ plans include WebP conversion. | 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 |
| Headquarters | Switzerland | Radom, Poland |
| Integrations | The plugin is compatible with WordPress Multisite and WooCommerce. | The maker lists WordPress and OpenCart plugins, plus Node.js and PHP SDKs and a REST API. |
| Maker | The site’s imprint identifies proinity GmbH and lists Switzerland as its country. | The privacy policy identifies the controller as Roman Klymenko, Creative company ARTEX group, registered in Radom, Poland. |
| Metadata controls | Yes | Yes |
| Purpose | Optimus is a WordPress image compression plugin that automatically optimizes images uploaded to WordPress. | Pixozip provides an HTTP API and web dashboard for optimizing uploaded image files. |
| Supported formats | JPEG,PNG | JPG,JPEG,PNG,WebP,AVIF,JPEG XL,GIF,TIFF,SVG |