| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | — |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | — |
| Plans published | 5 | 4 |
| Spec score · Image Compression Software | 8.7 (#10) | 8.3 (#28) |
| Batch processing | Yes | No |
| Compression | The homepage says Pixozip can compress images by up to 90% without visible quality loss. | The maker says PNGOUT can often beat other programs by 5–10% with the right options. |
| Compression modes | both | lossless |
| Free plan | Yes | Yes |
| Integrations | The maker lists WordPress and OpenCart plugins, plus Node.js and PHP SDKs and a REST API. | The maker lists PNGGauntlet as a .NET-based Windows wrapper for PNGOUT; the tutorial also documents a Windows clipboard input option. |
| Metadata controls | Yes | Yes |
| Purpose | Pixozip provides an HTTP API and web dashboard for optimizing uploaded image files. | PNGOUT losslessly optimizes PNG files created by other programs. |
| Supported formats | JPG,JPEG,PNG,WebP,AVIF,JPEG XL,GIF,TIFF,SVG | PNG,GIF,BMP,JPG,TGA,PCX |