JPG to PNG: Why Transparency Matters (And How to Convert in the Browser)

You've got a logo saved as a JPG. You drop it onto a colored background in your design tool — and suddenly there's an ugly white box around it. That's the JPG transparency problem. And the fix is simple: convert it to PNG. But there's more to it than just changing the file extension. Let's break down why transparency works the way it does, and how to handle JPG → PNG conversion entirely in the browser. Why JPG Doesn't Support Transparency JPG (JPEG) uses lossy compression designed for photographs. Every pixel in a JPG has three values: Red, Green, Blue. That's it — no fourth channel for transparency. PNG, on the other hand, supports an alpha channel — a fourth value per pixel that controls opacity from 0 (fully transparent) to 255 (fully opaque). JPG pixel: R, G, B (3 channels) PNG pixel: R, G, B, A (4 channels — A = alpha/transparency) When you open a JPG in an editor and "remove the background," what actually happens is the editor replaces those pixels with transparency — but if you