How Does Image Compression Work?
Image compression reduces file weight by removing redundant data and optimizing how color and brightness information is stored.
For JPEG and WebP images, our algorithm performs lossy quantization: it subtly discards high-frequency color variations that the human eye cannot perceive while preserving edges, subjects, and text sharpness.
Choosing Between Formats: JPEG, WebP, and PNG
- WebP: The modern web standard developed by Google. Provides 25%–35% smaller file sizes than JPEG at equivalent visual quality.
- JPEG: Universally compatible across every platform, browser, printer, and legacy operating system. Excellent for photography.
- PNG: Lossless compression format. Ideal for screenshots, icons, and graphics requiring transparent backgrounds.
Frequently Asked Questions
How much can I reduce an image's file size?
Most unprocessed camera photos (2 MB – 8 MB) can easily be compressed by 60% to 85% with zero noticeable loss in visual clarity when viewed on mobile or desktop displays.
Why doesn't PNG compress as much as JPEG?
PNG is a strictly lossless format. It preserves every single pixel's exact color value without discarding information. To reduce PNG file sizes significantly, consider converting to WebP or JPEG.
Can I compress multiple images at once?
Yes! Use our Batch Image Resizer to process tens or hundreds of images sequentially and download them all as a single ZIP archive.