Overview of the Formats
Selecting the right image format is critical to balancing visual quality and page performance. Use this table for a quick summary of the differences:
| Format | Compression | Transparency | Best Used For |
|---|---|---|---|
| JPG / JPEG | Lossy | No | Photographs, complex color gradients |
| PNG | Lossless | Yes | Logos, screenshots, text graphics |
| WebP | Lossy & Lossless | Yes | Web performance, replacing JPG & PNG |
1. JPG / JPEG (Joint Photographic Experts Group)
JPG is the most widely supported format on the planet. It uses lossy compression, meaning it permanently discards certain color variations to shrink file sizes.
When to use JPG: Photographic images or scans with soft gradients. JPG is ideal when you can sacrifice minor data details for smaller, easy-to-share files. It does not support transparent backgrounds.
2. PNG (Portable Network Graphics)
PNG is a lossless compression format, meaning the image data is reconstructed bit-for-bit exactly when opened. It supports alpha-channel transparency, making it possible to have see-through backgrounds.
When to use PNG: Logos, digital icons, text-heavy screenshots, or illustrations with transparent overlays. Avoid using PNG for high-resolution photos, as file sizes will be extremely large.
3. WebP (Web Picture Format)
WebP is Google's modern format that combines the features of both JPG and PNG. It supports transparency, lossless layouts, and lossy compression, while producing file sizes that are 25% to 30% smaller than their predecessors.
When to use WebP: Speeding up website loading speeds. WebP is now the standard recommendation for modern web design assets.