Image Compression
Techniques for reducing image file size, broadly categorized into lossless (reversible) and lossy (irreversible) methods.
Image compression reduces file size by eliminating redundant or perceptually insignificant data. The two main categories are lossless compression (PNG, WebP Lossless), which preserves the original data exactly, and lossy compression (JPEG, WebP Lossy), which discards information imperceptible to human vision.
Lossy compression uses a quality parameter (0-100 for JPEG) to balance file size against visual fidelity. Quality 80 is widely considered the sweet spot, achieving 60-80% size reduction with minimal perceptible degradation. Below quality 50, block artifacts and ringing become noticeable.
Since images typically account for the majority of web page weight, proper compression directly improves Core Web Vitals (especially LCP). The image compression tool lets you reduce file sizes substantially while preserving visual quality.