How Image Compression Works
Image compression works by reducing redundant or imperceptible color and pixel data:
- Lossy Compression (JPEG & WebP): Discards high-frequency color variations that the human eye cannot easily distinguish. This typically reduces file weight by 60% to 85% with virtually no perceptible difference at normal viewing distances.
- Lossless Compression (PNG): Identifies repeating patterns without discarding any pixel data, ideal for diagrams, screenshots, and logos with crisp text.
Frequently Asked Questions
Will compressing an image ruin its quality?
At quality settings between 75% and 85%, file size is dramatically reduced while visual degradation remains imperceptible on standard screens.
Are my personal photos uploaded to a cloud server?
Never. ToolNova processes your images 100% locally in your web browser using HTML5 Canvas. Your photos never leave your device.