Format comparison
JPG vs PNG: Which Image Format Should You Use?
JPG and PNG are both widely supported, but they store images in very different ways. JPG is designed to keep photo files compact by discarding some visual information. PNG uses lossless compression and can store transparency, making it a better fit for graphics, screenshots, and working files that need crisp edges.
The practical difference between JPG and PNG
JPG uses lossy compression: it reduces file size by simplifying image information in ways that usually work well for photographs. Repeated JPG exports can gradually add visible artifacts, especially around text and sharp edges.
PNG uses lossless compression, so saving decoded pixels as PNG does not intentionally discard more detail. PNG also supports an alpha channel for transparent and partially transparent pixels. Those benefits can produce much larger files for detailed photographs.
Choose JPG for photographs and everyday sharing
A camera photo contains many colors, textures, and gradual changes. JPG compression is designed for that kind of content and often creates a much smaller file than PNG at a visually acceptable quality.
- Email attachments, messaging, and ordinary photo sharing.
- Upload forms and software where maximum compatibility matters.
- Website photographs when a modern WebP or AVIF workflow is not available.
Choose PNG for transparency and crisp graphics
Screenshots, interface graphics, diagrams, logos, and text-heavy images often contain sharp boundaries that can reveal JPG artifacts. PNG keeps those decoded edges intact and can preserve transparency when the source actually includes it.
- Logos, overlays, and product cutouts that need transparent pixels.
- Screenshots, diagrams, and graphics containing small text.
- A lossless-encoded working copy that will be edited again.
What happens when JPG becomes PNG?
Converting JPG to PNG prevents another lossy encoding step, but it does not restore detail already removed from the JPG. The PNG may be larger without looking better because it faithfully stores the pixels decoded from the existing source.
A format conversion also cannot invent transparency. JPG does not contain an alpha channel, so its background remains part of the image. Use a background-removal workflow when you need transparent pixels.
What happens when PNG becomes JPG?
Converting PNG to JPG can substantially reduce a photo-like file, but the new output is lossy. Transparent areas must be flattened onto a solid color because JPG cannot store alpha transparency. PixDeer uses white for predictable output.
Keep the original PNG when it is your transparent master or when it contains graphics you may edit later. Treat the JPG as a delivery copy for a specific destination.