Why You Should Stop Using PNG for Standard Photographs
The PNG Misconception
Many people believe that because PNG is a "lossless" format, it is superior to JPEG and should be used for everything to preserve quality. This is a critical misunderstanding of how image formats work on the web.
How PNG Works
PNG (Portable Network Graphics) was designed for graphics with flat colors, sharp edges, text, and most importantly, transparency. It stores pixel data losslessly. However, when you save a complex photograph (like a landscape or a portrait with millions of colors) as a PNG, the file size explodes, often reaching 5MB to 10MB.
The Cost of Heavy Files
Using a 10MB PNG photograph as your website's hero image guarantees a terrible user experience. Mobile users will stare at a blank screen, and Google will penalize your search ranking for poor Core Web Vitals.
The Right Tool for the Job
- Use PNG for: Logos, icons, charts, screenshots of text, and images requiring a transparent background.
- Use JPEG (or WebP) for: Photographs, complex gradients, and large banner images. A JPEG can compress that 10MB PNG down to 300KB with virtually identical visual quality.