JPG, PNG, and WebP can all display ordinary web images, but they are designed around different trade-offs. Choosing the right format is usually more useful than looking for a single format that is “best” in every situation.
Quick recommendation
Use JPG for ordinary photographs when compatibility and predictable lossy compression matter. Use PNG when you need lossless pixels or transparency and the content suits PNG well. Use WebP when you want a modern web format that can handle both lossy images and transparency efficiently.
The right answer still depends on the actual image. A logo, screenshot, portrait, and product photograph do not compress the same way.
When to use JPG
JPG is a strong default for photographs. It can reduce large photographic images substantially by discarding some visual detail, and the quality level gives you direct control over the trade-off between appearance and file size.
JPG does not support transparency. If you convert an image with transparent pixels to JPG, those pixels must be composited against a background color first. imgevoke uses white by default and lets you choose another background in the Image Converter.
Avoid JPG when you need transparent edges or exact pixel preservation across repeated edits.
When to use PNG
PNG supports transparency and lossless image data, which makes it useful for interface captures, diagrams, icons, graphics with sharp edges, and images where preserving exact decoded pixels is important.
Lossless does not mean “always small.” A detailed photograph saved as PNG can be much larger than a good JPG or WebP version. PNG optimization can remove inefficiencies, but it cannot discard visual information just to hit a smaller target.
For PNG files that are already in the right format, Compress Image uses a lossless optimization path rather than lowering image quality.
When to use WebP
WebP is a flexible modern format that supports both lossy compression and transparency. It is often a good choice for web delivery when you control the environment and want to reduce image weight without giving up alpha transparency.
Like JPG, lossy WebP quality is adjustable. Like PNG, WebP can represent transparent areas. That combination makes it useful for many product images, web graphics, and photos with cut-out backgrounds.
If you are unsure, compare the actual outputs rather than relying on the extension alone. Use the Image Converter to create alternate formats locally, then compare file size, transparency, and visible quality for your specific image.