Lossless Image Compression | MiniPx — Free, Fast & Private
Lossless compression reduces file size without discarding any image data. Every pixel in the output is identical to the original. This is essential for medical imaging, technical diagrams, screenshots with text, and any image where pixel-perfect accuracy matters.
PNG is the primary lossless format for web use. MiniPx optimizes PNG files by improving the compression algorithm efficiency — reorganizing data to compress better without changing a single pixel value.
The trade-off is that lossless compression achieves smaller reductions than lossy compression. While lossy JPEG compression might reduce a photo by 80-90%, lossless PNG optimization typically achieves 10-30% reduction. The benefit is zero quality loss.
For photographs where minor quality loss is acceptable, lossy formats (JPEG, WebP) produce dramatically smaller files. Lossless compression is best reserved for graphics, screenshots, diagrams, and images that will be edited further.
MiniPx processes lossless compression entirely in your browser. No images are uploaded to any server — important when working with sensitive technical documents and medical images.