A PNG screenshot of my desktop runs about 2 MB. Convert it to JPG and it drops to maybe 300 KB. Same screen. Same words. One sixth of the size.

So why does anyone use PNG at all? Because that 300 KB comes with strings attached.

What PNG gives you that JPG can't

Two things: perfect sharpness and transparency.

PNG compresses without throwing anything away. Every pixel is exactly what it was. That's why logos, icons, screenshots, and text-heavy graphics look crisp as PNGs. JPG smears fine details (engineers call them artifacts, you'll call them ugly halos around text).

And PNG handles transparent backgrounds. JPG physically cannot. A JPG of a logo always has a box of solid color behind it.

What JPG gives you that PNG can't

Small files. That's the whole trade.

JPG was built for photos, and photos are forgiving. The compression throws away detail your brain fills in anyway: subtle color shifts in a sky, grain in a shadow. For a photograph, this works beautifully.

The actual decision, made simple

Ask one question: does this image have text, lines, or transparency?

Yes to any of those, keep the PNG. No to all of them (a straight photo), convert to JPG and enjoy the smaller file. This rule handles about 95 percent of real cases.

The remaining 5 percent is graphics with flat colors and no transparency, like a cartoon illustration. Try the JPG conversion and zoom in. If the edges look clean, ship it.

Practical tip: converting PNG to JPG for the web? Set quality around 80 percent if the tool offers a slider. Below that, photos start to look muddy. Above that, you're paying for bytes you can't see.

A quick conversion

Jiggle X Wiggle's free converter turns PNGs into JPGs in seconds. Upload, pick JPG, download. No account, no watermark.

The trade-off is real, but it only bites when you pick the wrong format for the job. Now you won't.