seo-image-converter supports three mainstream web image formats, each using the industry's optimal compression scheme:
WebP Format
As a modern image format launched by Google, WebP typically saves 25-35% of the size compared to JPEG while maintaining quality. The project uses the native Pillow library for optimization to ensure compatibility and stability.
PNG Format (Zopfli Compression)
For images requiring transparent channels, the project uses Google's Zopfli compression algorithm. Compared to standard PNG compression, Zopfli can provide an additional compression rate of about 5%. Although processing time is slightly longer, it is completely worth it for static resources.
JPEG Format (MozJPEG Optimization)
The MozJPEG library developed by Mozilla can save 20-30% of the size compared to standard JPEG at the same visual quality through improved quantization tables and scan optimization. This is especially effective for photo content.